When your Brivis system stops and shows a code, that code is the system telling you roughly where the problem is. Roughly is the key word. A fault code points in a direction, it rarely names the exact fix. Find your system below, tap your code, and it will take you straight to what it means and what to do.
Before you try anything: the only DIY steps that are ever safe are switching the system off at the isolator (and waiting 20 to 30 minutes), cleaning or checking filters, checking the controller settings and batteries, and keeping the outdoor unit clear. Anything behind a panel, anything electrical, and anything involving refrigerant or gas is licensed work. If a code below says switch off and call, please take it at its word.
How to read the tables: 🟢 means there is a safe first step worth trying. 🟡 means book a service, the system needs a technician. 🔴 means switch the system off at the isolator and call us on (02) 4760 0100.
Brivis DRCi ducted reverse cycle inverter (indoor DINLR07-17Z72, outdoor DONSR07-17Z72; identical wall controller table applies to the Z71 generation per the 2013 Brivis booklet)
Where the code shows: wall controller (KJR-120C1/BTF-E or Brivis-badged equivalent).
| Code | What it means | What to do |
|---|---|---|
| F0 | The wall controller has lost contact with the indoor unit. Communication error, wired controller to indoor unit. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E0 | The unit has picked up a problem with its incoming power phases. Power supply phase error. |
🟡 If this appeared after a blackout, try switching off at the isolator for 20-30 minutes. If it stays on, book a service. |
| E1 | The indoor and outdoor units are not talking to each other. Indoor-outdoor communication error. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E2 | The return air temperature sensor is not reading properly. T1 sensor fault. |
🟡 Book a service. |
| E3 | One of the indoor coil temperature sensors is not reading properly. T2A sensor fault. |
🟡 Book a service. |
| E4 | One of the indoor coil temperature sensors is not reading properly. T2B sensor fault. |
🟡 Book a service. |
| E5 | An outdoor temperature sensor or the compressor discharge sensor is not reading properly. T3/T4 or compressor discharge sensor fault. |
🟡 Book a service. |
| E6 | The indoor coil is getting too cold, so the system has paused itself to stop ice forming. System anti-freeze protection. |
🟡 Check the return air filter is clean and your vents are open. If the code keeps coming back, book a service. |
| E7 | The control board's memory chip is not reading properly. EEPROM malfunction. |
🟡 Book a service. |
| E8 | The fan is not running at the speed the system asked for. Fan speed error. |
🟡 Book a service. |
| E9 | Two of the unit's internal boards have stopped talking to each other. Main board to display board communication error. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| EA | The compressor has repeatedly drawn too much current and the system has shut it down to protect it. Compressor current protection, tripped four times. |
🔴 Switch the system off at the isolator and give us a call. |
| EB | The power module that drives the compressor has a fault. IPM (inverter power module) malfunction. |
🟡 Book a service. |
| EC | The fresh air module has a fault. Fresh air function malfunction. |
🟡 Book a service. |
| ED | The outdoor unit has gone into a protection mode – the specific fault shows on the outdoor unit itself. Outdoor unit protection fault. |
🟡 Book a service. |
| EE | The condensate drain system thinks the water level is too high. Water-level alarm and/or other malfunction. |
🟡 Book a service. |
| EF | A fault the system can't pin down to one category. Other malfunction. |
🟡 Book a service. |
| CP | The master controller has locked the system out. Master control lockout. |
🟡 Book a service. |
| F1 | The fascia panel on a cassette indoor unit has a fault. Cassette fascia malfunction – applies to cassette-style indoor units on this platform. |
🟡 Book a service. |
Brivis DRCi ducted reverse cycle inverter (indoor DINLR07-17Z72, outdoor DONSR07-17Z72)
Where the code shows: indoor unit PCB / display board on high static pressure ducted units (code plus timer and operation lamp flashes).
| Code | What it means | What to do |
|---|---|---|
| E0 | The indoor unit's memory chip is not reading properly. Indoor EEPROM malfunction. |
🟡 Book a service. |
| E1 | The indoor and outdoor units are not talking to each other. Indoor-outdoor communication malfunction. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E3 | The indoor fan is not running at the right speed. Indoor fan speed malfunction. |
🟡 Book a service. |
| E4 | The room air temperature sensor is not reading properly. T1 sensor open or short circuit. |
🟡 Book a service. |
| E5 | The indoor coil temperature sensor is not reading properly. T2 sensor open or short circuit. |
🟡 Book a service. |
| EC | The system suspects it is losing refrigerant. Refrigerant leakage detection. |
🔴 Switch the system off at the isolator and give us a call. |
| EE | The condensate drain system thinks the water level is too high. Water level alarm malfunction. |
🟡 Book a service. |
| E8 | On twin-unit systems, the two indoor units have stopped talking to each other. Master-slave communication error (twins systems). |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E9 | On twin-unit systems, the other indoor unit has a fault. Other indoor unit malfunction (twins systems). |
🟡 Book a service. |
| F0 | The system has cut out because it was drawing too much current. Overcurrent protection (some units). |
🟡 Book a service. |
| F1 | The outdoor air temperature sensor is not reading properly. T4 sensor open or short circuit. |
🟡 Book a service. |
| F2 | The outdoor coil temperature sensor is not reading properly. T3 sensor open or short circuit. |
🟡 Book a service. |
| F3 | The compressor discharge temperature sensor is not reading properly. T5 sensor open or short circuit. |
🟡 Book a service. |
| F4 | The outdoor unit's memory chip is not reading properly. Outdoor EEPROM malfunction (some units). |
🟡 Book a service. |
| F5 | The outdoor fan is not running at the right speed. Outdoor fan speed malfunction. |
🟡 Book a service. |
| F6 | An indoor coil outlet sensor is not reading properly. T2B open or short circuit (free-match indoor units). |
🟡 Book a service. |
| P0 | The power module that drives the compressor has a fault. IPM module malfunction. |
🟡 Book a service. |
| P1 | The internal supply voltage has gone too high or too low. DC voltage protection. |
🟡 If this appeared after a blackout or brownout, try switching off at the isolator for 20-30 minutes. If it stays on, book a service. |
| P2 | The top of the compressor has become too hot and the system has shut down to protect it. Compressor top high temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P3 | It is too cold outside for the system to run – it has paused itself for protection. Low ambient temperature protection. |
🟢 This usually clears itself when conditions warm up. If it shows in mild weather, book a service. |
| P4 | The electronics that drive the compressor have gone into protection. Inverter compressor drive protection. |
🟡 Book a service. |
| P6 | The compressor's supply voltage has gone out of range. Compressor voltage protection. |
🟡 Book a service. |
| P7 | A temperature sensor on the outdoor power electronics is faulty. Outdoor IGBT sensor fault. |
🟡 Book a service. |
Brivis DRCi ducted reverse cycle inverter (indoor DINLR07-17Z72, outdoor DONSR07-17Z72)
Where the code shows: outdoor unit PCB display.
| Code | What it means | What to do |
|---|---|---|
| E1 | The indoor and outdoor units are not talking to each other. Indoor-outdoor communication malfunction. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| F0 | The system has cut out because it was drawing too much current. Overcurrent protection. |
🟡 Book a service. |
| F1 | The outdoor air temperature sensor is not reading properly. Ambient sensor (T4) malfunction. |
🟡 Book a service. |
| F2 | The outdoor coil temperature sensor is not reading properly. Outdoor heat exchanger sensor (T3) malfunction. |
🟡 Book a service. |
| F3 | The compressor discharge temperature sensor is not reading properly. Discharge sensor (T5) malfunction. |
🟡 Book a service. |
| F4 | The outdoor unit's memory chip is not reading properly. Outdoor EEPROM malfunction. |
🟡 Book a service. |
| F5 | The outdoor fan is not running at the right speed. Outdoor fan speed malfunction. |
🟡 Book a service. |
| P0 | The power module that drives the compressor has gone into protection. IPM module protection. |
🟡 Book a service. |
| P1 | The internal supply voltage has gone too high or too low. DC voltage protection. |
🟡 If this appeared after a blackout or brownout, try switching off at the isolator for 20-30 minutes. If it stays on, book a service. |
| P3 | It is extremely cold outside and the system has paused itself for protection. Ultra-low ambient temperature protection. |
🟢 This usually clears itself when conditions warm up. If it shows in mild weather, book a service. |
| P4 | The compressor motor is not turning the way the electronics expect. Compressor rotor position protection. |
🟡 Book a service. |
| J0 | The indoor coil has become too hot and the system is protecting itself. Evaporator high temperature protection. |
🟡 Check the return air filter is clean and vents are open, then book a service if it happens again. |
| J1 | The outdoor coil has become too hot and the system is protecting itself. Condenser high temperature protection. |
🟡 Check the outdoor unit has clear space around it and is not clogged with leaves or debris, then book a service if it continues. |
| J2 | The compressor is running dangerously hot and the system has shut down to protect it. High discharge temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| J3 | The power factor correction module has gone into protection. PFC module protection. |
🟡 Book a service. |
| J4 | Two chips inside the outdoor unit have stopped talking to each other. Communication error between outdoor main chip and compressor drive chip. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| J5 | Refrigerant pressure has gone too high and the system has shut down to protect itself. High pressure protection. |
🔴 Switch the system off at the isolator and give us a call. |
| J6 | Refrigerant pressure has dropped too low, which can mean the system is losing refrigerant. Low pressure protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P7 | A temperature sensor on the outdoor power electronics is faulty. IGBT sensor malfunction. |
🟡 Book a service. |
| J8 | The incoming mains voltage has gone out of range. AC power input voltage protection. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
Multi head reverse cycle inverter (outdoor MON3H071/MON4H09/MON5H11/MON5H13 with DINSD ducted, HINRA wall-mounted and CIN cassette indoor units)
Where the code shows: indoor unit display plus operation/timer lamp flashes (OASIS, All Easy and Light Commercial indoor series).
| Code | What it means | What to do |
|---|---|---|
| E0 | The indoor unit's memory chip is not reading properly. Indoor EEPROM parameter error. |
🟡 Book a service. |
| E1 | The indoor and outdoor units are not talking to each other. Indoor-outdoor communication malfunction. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E3 | The indoor fan is not running at the right speed. Indoor fan speed malfunction. |
🟡 Book a service. |
| E4 | The room air temperature sensor is not reading properly. Indoor room sensor (T1) malfunction. |
🟡 Book a service. |
| E5 | The indoor coil temperature sensor is not reading properly. Evaporator coil sensor (T2) malfunction. |
🟡 Book a service. |
| EE | The condensate drain system thinks the water level is too high (cassette and ducted indoor units). Water-level alarm malfunction. |
🟡 Book a service. |
| F1 | The outdoor air temperature sensor is not reading properly. Outdoor ambient sensor (T4) malfunction. |
🟡 Book a service. |
| F2 | The outdoor coil temperature sensor is not reading properly. Condenser coil sensor (T3) malfunction. |
🟡 Book a service. |
| F3 | The compressor discharge temperature sensor is not reading properly. Discharge sensor (T5) malfunction. |
🟡 Book a service. |
| F4 | The outdoor unit's memory chip is not reading properly. Outdoor EEPROM parameter error. |
🟡 Book a service. |
| F5 | The outdoor fan is not running at the right speed. Outdoor fan speed malfunction. |
🟡 Book a service. |
| F6 | An indoor coil outlet sensor is not reading properly. Indoor coil outlet pipe sensor (on outdoor unit low pressure side); source text truncated. |
🟡 Book a service. |
| P0 | The power module that drives the compressor has a fault. Inverter module (IPM) malfunction. |
🟡 Book a service. |
| P1 | The mains voltage has gone too high or too low. Over-voltage or under-voltage protection. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| P4 | The electronics that drive the compressor have gone into protection. Compressor drive malfunction. |
🟡 Book a service. |
| P5 | Two indoor units are asking for opposite things – one is set to heat while another is set to cool. Indoor unit mode conflict. |
🟢 Set all the indoor units to the same mode (all heating or all cooling). The code should clear on its own. |
| P6 | Refrigerant pressure has dropped too low, which can mean the system is losing refrigerant. Low pressure protection. |
🔴 Switch the system off at the isolator and give us a call. |
Multi head reverse cycle inverter (outdoor MON3H071/MON4H09/MON5H11/MON5H13)
Where the code shows: outdoor unit display (codes self-clear about 30 seconds after the fault ends, except E2 and E3).
| Code | What it means | What to do |
|---|---|---|
| E0 | The outdoor unit's memory chip is not reading properly. Outdoor EEPROM parameter error. |
🟡 Book a service. |
| E2 | The indoor and outdoor units are not talking to each other. Indoor-outdoor communication malfunction. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E3 | Two boards inside the outdoor unit have stopped talking to each other. Communication malfunction between IPM board and outdoor main control board. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E4 | One of the outdoor unit's temperature sensors is not reading properly. T3 coil, T4 ambient, T5 discharge or T2B indoor coil outlet sensor malfunction. |
🟡 Book a service. |
| E5 | The mains voltage has gone too high or too low. Over-voltage or under-voltage protection. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E6 | The power factor correction module has gone into protection. PFC module protection. |
🟡 Book a service. |
| E8 | The outdoor fan is not running at the right speed. Outdoor fan speed malfunction. |
🟡 Book a service. |
| F1 | The coil outlet sensor for indoor unit A is not reading properly. Indoor unit A coil outlet temperature sensor malfunction. |
🟡 Book a service. |
| F2 | The coil outlet sensor for indoor unit B is not reading properly. Indoor unit B coil outlet temperature sensor malfunction. |
🟡 Book a service. |
| F3 | The coil outlet sensor for indoor unit C is not reading properly. Indoor unit C coil outlet temperature sensor malfunction. |
🟡 Book a service. |
| F4 | The coil outlet sensor for indoor unit D is not reading properly. Indoor unit D coil outlet temperature sensor malfunction. |
🟡 Book a service. |
| F5 | The coil outlet sensor for indoor unit E is not reading properly. Indoor unit E coil outlet temperature sensor malfunction. |
🟡 Book a service. |
| P1 | Refrigerant pressure has gone too high and the system has shut down to protect itself. High pressure protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P2 | Refrigerant pressure has dropped too low, which can mean the system is losing refrigerant. Low pressure protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P3 | The system has cut out because it was drawing too much current. Current overload protection. |
🟡 Book a service. |
| P4 | The compressor is running dangerously hot and the system has shut down to protect it. Compressor discharge temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P5 | The outdoor coil has become too hot and the system is protecting itself. Condenser high temperature protection. |
🟡 Check the outdoor unit has clear space around it and is not clogged with leaves or debris, then book a service if it continues. |
| P6 | The power module that drives the compressor has gone into protection. Inverter module (IPM) protection. |
🟡 Book a service. |
Brivis Ice add-on cooling inverter (DINLUXXZ7, DINXUXXZ7 and DONSCXXZ7, incl. DINXU/DONSC 10/13/15Z7) – inverter cooling added to a gas ducted heater
Where the code shows: indoor warning lights (operation/timer/defrost/alarm lamps) or fault code on the unit display.
| Code | What it means | What to do |
|---|---|---|
| E1 | The indoor and outdoor units are not talking to each other. Indoor-outdoor communication malfunction. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E2 | The return air temperature sensor is not reading properly. T1 sensor open or short circuit. |
🟡 Book a service. |
| E3 | The indoor coil temperature sensor is not reading properly. T2 sensor open or short circuit. |
🟡 Book a service. |
| E4 | An indoor coil outlet sensor is not reading properly. T2B sensor open or short circuit. |
🟡 Book a service. |
| EE | The condensate drain system thinks the water level is too high. Full-water malfunction. |
🟡 Book a service. |
| E7 | The unit's memory chip is not reading properly. EEPROM malfunction. |
🟡 Book a service. |
| E8 | The indoor fan is not running at the speed the system asked for. Indoor fan speed out of control. |
🟡 Book a service. |
| Ed | The outdoor unit has a fault – the specific code shows on the outdoor unit itself. Outdoor unit malfunction. |
🟡 Book a service. |
Brivis Ice add-on cooling inverter (DINLUXXZ7, DINXUXXZ7 and DONSCXXZ7, incl. DINXU/DONSC 10/13/15Z7)
Where the code shows: outdoor unit PCB display.
| Code | What it means | What to do |
|---|---|---|
| E0 | The outdoor unit's memory chip is not reading properly. EEPROM malfunction. |
🟡 Book a service. |
| E2 | The indoor and outdoor control boards are not talking to each other. Indoor PCB to outdoor PCB communication malfunction. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E3 | Two processors inside the outdoor unit have stopped talking to each other. Communication malfunction with DSP on outdoor PCB. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E4 | An outdoor temperature sensor is not reading properly. T3 or T4 sensor open or short circuit. |
🟡 Book a service. |
| E5 | The compressor's supply voltage has gone out of range. Compressor voltage protection. |
🟡 If this appeared after a blackout, try switching off at the isolator for 20-30 minutes. If it stays on, book a service. |
| E6 | The power factor correction module has gone into protection (larger models only). PFC module protection – 30K, 36K, 48K and 60K models. |
🟡 Book a service. |
| E8 | The outdoor fan is not running at the speed the system asked for (some models). Outdoor fan speed out of control – 24k, 30k and 36k models. |
🟡 Book a service. |
| P0 | The top of the compressor has become too hot and the system has shut down to protect it. Compressor top temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P1 | Refrigerant pressure has gone too high and the system has shut down to protect itself. High pressure protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P2 | Refrigerant pressure has dropped too low, which can mean the system is losing refrigerant. Low pressure protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P3 | The compressor has drawn too much current and the system has cut out to protect it. Compressor current protection. |
🟡 Book a service. |
| P4 | The compressor is running dangerously hot and the system has shut down to protect it. Compressor discharge temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P5 | The outdoor coil has become too hot and the system is protecting itself. Condenser high temperature protection. |
🟡 Check the outdoor unit has clear space around it and is not clogged with leaves or debris, then book a service if it continues. |
| P6 | The power module that drives the compressor has gone into protection. Module protection. |
🟡 Book a service. |
| P7 | The indoor coil has become too hot and the system is protecting itself. Evaporator high temperature protection. |
🟡 Check the return air filter is clean and vents are open, then book a service if it happens again. |
Brivis DRCi ducted reverse cycle inverter, first generation (indoor DINLR05-17Z71, outdoor DONSR05-17Z71)
Where the code shows: outdoor unit PCB display.
| Code | What it means | What to do |
|---|---|---|
| E0 | The outdoor unit's memory chip is not reading properly. EEPROM malfunction. |
🟡 Book a service. |
| E2 | The indoor and outdoor control boards are not talking to each other. Indoor PCB to outdoor PCB communication failure. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E3 | Two processors inside the outdoor unit have stopped talking to each other. Outdoor PCB to DSP communication failure. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E4 | An outdoor temperature sensor is not reading properly. Outdoor coil or ambient sensor failure. |
🟡 Book a service. |
| E5 | The compressor's supply voltage has gone out of range. Compressor voltage protection. |
🟡 If this appeared after a blackout, try switching off at the isolator for 20-30 minutes. If it stays on, book a service. |
| E6 | The power factor correction module has gone into protection. PFC module protection. |
🟡 Book a service. |
| P1 | Refrigerant pressure has gone too high and the system has shut down to protect itself. High pressure fault. |
🔴 Switch the system off at the isolator and give us a call. |
| P2 | Refrigerant pressure has dropped too low, which can mean the system is losing refrigerant. Low pressure fault. |
🔴 Switch the system off at the isolator and give us a call. |
| P3 | The compressor has drawn too much current and the system has cut out to protect it. Compressor current protection. |
🟡 Book a service. |
| P4 | The compressor is running dangerously hot and the system has shut down to protect it. Discharge temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P5 | The outdoor coil has become too hot and the system is protecting itself. Condenser high temperature protection. |
🟡 Check the outdoor unit has clear space around it and is not clogged with leaves or debris, then book a service if it continues. |
| P6 | The power module that drives the compressor has gone into protection. Module protection. |
🟡 Book a service. |
| P7 | The indoor coil has become too hot and the system is protecting itself. Evaporator high temperature protection. |
🟡 Check the return air filter is clean and vents are open, then book a service if it happens again. |
Brivis DRCi ducted reverse cycle inverter, first generation (indoor DINLR05-17Z71, outdoor DONSR05-17Z71)
Where the code shows: indoor receiver LED lamps (operation/timer/defrost/alarm), with the matching code shown on the wall controller.
| Code | What it means | What to do |
|---|---|---|
| E1 | The indoor and outdoor units are not talking to each other. Indoor-outdoor communication fault. LED pattern: timer lamp flashing. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E2 | The room air temperature sensor is not reading properly. T1 sensor fault. LED pattern: operation lamp flashing. |
🟡 Book a service. |
| E3 | The indoor coil (middle pipe) temperature sensor is not reading properly. T2 sensor fault. |
🟡 Book a service. |
| E4 | The indoor coil (end pipe) temperature sensor is not reading properly. T2B sensor fault. |
🟡 Book a service. |
| EE | The condensate drain has a problem. Drain fault. LED pattern: alarm lamp flashing. |
🟡 Book a service. |
| E7 | The unit's memory chip is not reading properly. EEPROM fault. LED pattern: defrost lamp flashing. |
🟡 Book a service. |
| E8 | The indoor fan is not running at the right speed. Indoor fan speed fault. LED pattern: defrost and alarm lamps flashing. |
🟡 Book a service. |
| ED | The outdoor unit has a fault – the specific code shows on the outdoor unit itself. Outdoor unit fault. LED pattern: alarm lamp flashing. |
🟡 Book a service. |
APAC, BT and C series (HSNAP 25-80, HSNBT 25-80, HSNCS 25B-80B) – near-identical code tables, merged
Where the code shows: indoor unit digital display, with matching RUN/TIMER lamp flash patterns.
| Code | What it means | What to do |
|---|---|---|
| E0 | The indoor and outdoor units are not talking to each other. Indoor-outdoor communication failure. RUN and TIMER lamps both blinking. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| EC | The outdoor unit has dropped off the line – communication with it has failed. Outdoor communication failure. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E2 | The indoor coil temperature sensor is not reading properly. Indoor coil/pipe temperature sensor (IPT) fault. |
🟡 Book a service. |
| E3 | The outdoor coil temperature sensor is not reading properly. Outdoor coil/pipe temperature sensor (OPT) fault. |
🟡 Book a service. |
| E4 | The system has detected a general fault it can't pin to one part. System abnormity. |
🟡 Book a service. |
| E5 | The indoor and outdoor units are not a matching pair, or the model configuration is wrong. Model configuration / type mismatch. |
🟡 Book a service. |
| E6 | The indoor fan motor has a fault. Indoor fan motor fault. |
🟡 Book a service. |
| E7 | The outdoor air temperature sensor is not reading properly. Outdoor temperature sensor fault. |
🟡 Book a service. |
| E8 | The compressor discharge temperature sensor is not reading properly. Exhaust/discharge temperature sensor fault. |
🟡 Book a service. |
| E9 | The power module that drives the compressor has a fault. IPM drive and module fault / inverter module abnormity. |
🟡 Book a service. |
| EF | The outdoor fan motor has a fault. Outdoor DC fan motor fault. |
🟡 Book a service. |
| EA | The current sensor has a fault. Current sensor fault. |
🟡 Book a service. |
| EE | The unit's memory chip is not reading properly. EEPROM failure. |
🟡 Book a service. |
| EP | The temperature switch on top of the compressor has a fault. Compressor top temperature switch fault. |
🟡 Book a service. |
| EU | The voltage sensor has a fault. Voltage sensor fault. |
🟡 Book a service. |
| P1 | The mains voltage has gone too high or too low. Over-voltage / under-voltage protection. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| P2 | The system has cut out because it was drawing too much current. Overcurrent protection. |
🟡 Book a service. |
| P4 | The compressor is running dangerously hot and the system has shut down to protect it. Exhaust/discharge over-temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P5 | The indoor coil is getting too cold in cooling mode, so the system is protecting itself against icing up. Too-cool protection in cooling mode. |
🟡 Check the return air filter is clean, then book a service if it happens again. |
| P6 | The system is running too hot in cooling mode and has backed off to protect itself. Overheat protection in cooling mode. |
🟡 Check the outdoor unit has clear space around it and is not clogged with leaves or debris, then book a service if it continues. |
| P7 | The system is running too hot in heating mode and has backed off to protect itself. Overheat protection in heating mode. |
🟡 Check the return air filter is clean, then book a service if it happens again. |
| P8 | The outdoor temperature is beyond the range the unit can work in, so it has paused itself. Outdoor over-temperature / low-temperature protection. |
🟡 This can show in extreme weather. Check the outdoor unit has clear space around it. If it shows in mild conditions, book a service. |
| P9 | The compressor drive electronics have gone into protection. Drive protection (software controlled). |
🟡 Book a service. |
| P0 | The power module has gone into protection. Module protection (hardware controlled). |
🟡 Book a service. |
Brivis BR series (HSNBR 26/32/42/50/70/80 and the later HSNBR 26M-80M) – indoor display type 1
Where the code shows: two-digit LCD on the indoor unit.
| Code | What it means | What to do |
|---|---|---|
| E0 | The unit's memory chip is not reading properly. EEPROM error. |
🟡 Book a service. |
| E1 | The indoor and outdoor units are not talking to each other. Indoor to outdoor communication error. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E2 | The control board is not reading the mains power waveform properly. Zero-crossing error. |
🟡 Book a service. |
| E3 | The indoor fan is not running at the right speed. Indoor fan speed error. |
🟡 Book a service. |
| E5 | The outdoor temperature sensor is not reading properly. Outdoor temperature sensor error. |
🟡 Book a service. |
| E6 | The room air sensor or the indoor coil sensor is not reading properly. Room or evaporator sensor error. |
🟡 Book a service. |
| P0 | The system has cut out because it was drawing too much current. Overcurrent protection. |
🟡 Book a service. |
| P1 | The mains voltage has gone too high or too low. Voltage protection. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| P2 | The compressor has become too hot and the system has shut down to protect it. Compressor temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P4 | The electronics that drive the compressor have gone into protection. Compressor drive protection. |
🟡 Book a service. |
Brivis BR series (HSNBR 26M-80M) – indoor display type 2 (LED lamp models)
Where the code shows: indoor unit LED lamps (operation/timer) plus displayed code – note E5 means something different here than on display type 1 units.
| Code | What it means | What to do |
|---|---|---|
| E0 | The indoor unit's memory chip is not reading properly. Indoor EEPROM parameter error. |
🟡 Book a service. |
| E1 | The indoor and outdoor units are not talking to each other. Indoor/outdoor communication error. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E2 | The control board is not reading the mains power waveform properly. Zero-crossing signal error. |
🟡 Book a service. |
| E3 | The indoor fan is not running at the right speed. Indoor fan speed error. |
🟡 Book a service. |
| E4 | The room air temperature sensor is not reading properly. Indoor room temperature sensor error. |
🟡 Book a service. |
| E5 | The indoor coil temperature sensor is not reading properly. Evaporator coil temperature sensor error. |
🟡 Book a service. |
| EC | The system suspects it is losing refrigerant. Refrigerant leakage detection. |
🔴 Switch the system off at the isolator and give us a call. |
| F1 | The outdoor air temperature sensor is not reading properly. Outdoor ambient temperature sensor error. |
🟡 Book a service. |
| F2 | The outdoor coil temperature sensor is not reading properly. Condenser coil temperature sensor error. |
🟡 Book a service. |
| F3 | The compressor discharge temperature sensor is not reading properly. Compressor discharge temperature sensor error. |
🟡 Book a service. |
| F4 | The outdoor unit's memory chip is not reading properly. Outdoor EEPROM parameter error. |
🟡 Book a service. |
| P0 | The system has cut out because it was drawing too much current. Overcurrent protection. |
🟡 Book a service. |
| P1 | The mains voltage has gone too high or too low. Over-voltage or low-voltage protection. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| P2 | The compressor has become too hot and the system has shut down to protect it. Compressor high temperature protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P4 | The electronics that drive the compressor have gone into protection. Inverter compressor drive error. |
🟡 Book a service. |
D series (HSNRA 26/35/50/70/80)
Where the code shows: indoor unit display plus operation/timer lamp flashes.
| Code | What it means | What to do |
|---|---|---|
| E0 | The indoor unit's memory chip is not reading properly. Indoor EEPROM parameter error. |
🟡 Book a service. |
| E1 | The indoor and outdoor units are not talking to each other. Indoor/outdoor communication error. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E3 | The indoor fan is not running at the speed the system asked for. Indoor fan speed out of control. |
🟡 Book a service. |
| E4 | The room air temperature sensor is not reading properly. T1 sensor open or short circuit. |
🟡 Book a service. |
| E5 | The indoor coil temperature sensor is not reading properly. T2 sensor open or short circuit. |
🟡 Book a service. |
| EC | The system suspects it is losing refrigerant. Refrigerant leakage detection. |
🔴 Switch the system off at the isolator and give us a call. |
| F0 | The system has cut out because it was drawing too much current. Overload current protection. |
🟡 Book a service. |
| F1 | The outdoor air temperature sensor is not reading properly. T4 sensor open or short circuit. |
🟡 Book a service. |
| F2 | The outdoor coil temperature sensor is not reading properly. T3 sensor open or short circuit. |
🟡 Book a service. |
| F3 | The compressor discharge temperature sensor is not reading properly. T5 sensor open or short circuit. |
🟡 Book a service. |
| F4 | The outdoor unit's memory chip is not reading properly. Outdoor EEPROM parameter error. |
🟡 Book a service. |
| F5 | The outdoor fan is not running at the speed the system asked for. Outdoor fan speed out of control. |
🟡 Book a service. |
| P0 | The power module that drives the compressor has cut out to protect itself. IPM malfunction or IGBT over-strong current protection. |
🟡 Book a service. |
| P1 | The mains voltage has gone too high or too low. Over-voltage or under-voltage protection. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| P2 | The compressor or its power module has become too hot and the system has shut down to protect it. High temperature protection of IPM module or compressor top. |
🔴 Switch the system off at the isolator and give us a call. |
| P4 | The electronics that drive the compressor have gone into protection. Inverter compressor drive error. |
🟡 Book a service. |
G series (RINV 25/35/70 RB)
Where the code shows: indoor unit display (outdoor faults also flagged by a three-LED pattern on the outdoor module board).
| Code | What it means | What to do |
|---|---|---|
| E1 | The room air temperature sensor is not reading properly. Indoor room temperature thermistor abnormality. |
🟡 Book a service. |
| E3 | The indoor coil temperature sensor is not reading properly. Indoor heat exchanger thermistor abnormality. |
🟡 Book a service. |
| E4 | The indoor fan motor is not running properly. Fan motor system abnormality. |
🟡 Book a service. |
| E5 | The indoor and outdoor units are not talking to each other. Signal transmission error. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| E2 | The outdoor coil temperature sensor is not reading properly. Outdoor heat exchanger thermistor abnormality. |
🟡 Book a service. |
| F1 | The outdoor power module board has a fault. Outdoor unit module board abnormality. |
🟡 Book a service. |
| F3 | The compressor is not running properly. Compressor abnormality – drive board monitors compressor current. |
🔴 Switch the system off at the isolator and give us a call. |
| F4 | The compressor discharge temperature sensor is not reading properly. Discharge pipe temperature thermistor abnormality. |
🟡 Book a service. |
| F5 | The compressor's temperature sensing system has flagged a fault – often a refrigerant problem. Compressor sensor system abnormality; the doc notes this fault is usually caused by a refrigerant issue. |
🔴 Switch the system off at the isolator and give us a call. |
| F6 | The outdoor air temperature sensor is not reading properly. Outdoor air thermistor abnormality. |
🟡 Book a service. |
| F7 | The mains voltage has gone too high or too low. Over-voltage protection (OVP) / low-voltage protection (LVP); trips below 135V or above 275V. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| F8 | Two boards inside the outdoor unit have stopped talking to each other. Signal transmission error between PCB and module board. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| F9 | The outdoor unit's memory chip is not reading properly. Outdoor unit PCB EEPROM abnormality. |
🟡 Book a service. |
| FA | The outdoor intake temperature sensor is not reading properly. Outdoor unit intake temperature thermistor abnormality. |
🟡 Book a service. |
Q series (HSNRQ 25/35/50/70/80B)
Where the code shows: indoor unit display (outdoor faults indicated by LED sequences on the outdoor board; troubleshooting method shared across codes).
| Code | What it means | What to do |
|---|---|---|
| E1 | The room air temperature sensor is not reading properly. Internal temperature sensor error. |
🟡 Book a service. |
| E2 | The outdoor coil temperature sensor is not reading properly. External coil sensor error. |
🟡 Book a service. |
| E3 | The indoor coil temperature sensor is not reading properly. Internal coil sensor error. |
🟡 Book a service. |
| E4 | The indoor fan motor is not running properly. Internal fan error (PG or DC motor). On floor-standing indoor models the same code covers a sliding door error. |
🟡 Book a service. |
| E5 | The indoor and outdoor units are not talking to each other. Internal/external communication error (also shown as 5E). |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| F0 | The outdoor fan motor has a fault. External DC fan error (3-core terminal motor). |
🟡 Book a service. |
| F1 | The power module that drives the compressor has gone into protection. Module protection error. |
🟡 Book a service. |
| F2 | The power factor correction circuit has gone into protection. PFC protection error. |
🟡 Book a service. |
| F3 | The compressor is failing to start. Compressor start-up error. |
🔴 Switch the system off at the isolator and give us a call. |
| F4 | The compressor discharge temperature sensor is not reading properly. Exhaust sensor error. |
🟡 Book a service. |
| F5 | The sensor on top of the compressor is not reading properly. Top head sensor error. |
🟡 Book a service. |
| F6 | The outdoor air temperature sensor is not reading properly. External temperature sensor error; thermistor open or short circuit. |
🟡 Book a service. |
| F7 | The mains voltage has gone too high or too low. OVP or UVP error; trips below 135V or above 275V. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| F8 | Two boards inside the outdoor unit have stopped talking to each other. Main external control panel to module panel communication error. |
🟢 Switch off at the isolator, wait 20-30 minutes, then switch back on. If the code returns, book a service. |
| F9 | The outdoor unit's memory chip is not reading properly. Outdoor EEPROM error. |
🟡 Book a service. |
| FA | The four-way valve or its sensing circuit has a fault, so the unit may not switch between heating and cooling properly. Recirculated sensor error / four-way valve switch error. |
🟡 Book a service. |
| Fb | The cabinet fan on a floor-standing indoor unit has a fault. Cabinet internal fan error (floor-standing models); troubleshooting as per E4. |
🟡 Book a service. |
| P1 | The condensate tray is full or its float switch has tripped. Water full alarm; the doc notes this should not appear on these split systems. |
🟡 Book a service. |
| P2 | Refrigerant pressure has gone too high and the system has shut down to protect itself. High pressure protection; the doc notes this should not appear on these split systems. |
🔴 Switch the system off at the isolator and give us a call. |
| P3 | Refrigerant pressure has dropped too low, which can mean the system is losing refrigerant. Low pressure protection; the doc notes this should not appear on these split systems. |
🔴 Switch the system off at the isolator and give us a call. |
| P4 | The outdoor unit is overloaded in cooling mode and has backed off to protect itself. Outdoor overload protection (cooling mode only). |
🟡 Check the outdoor unit has clear space around it and is not clogged with leaves or debris, then book a service if it continues. |
| P5 | The compressor discharge has become too hot and the system has shut down to protect it. Discharge / exhaust sensor protection. |
🔴 Switch the system off at the isolator and give us a call. |
| P6 | The system is running too hot in heating mode and has backed off to protect itself. High temperature protection (heating mode only). |
🟡 Check the return air filter is clean, then book a service if it happens again. |
| P7 | The indoor coil is getting too cold in cooling mode, so the system is protecting itself against icing up. Indoor anti-freeze protection (cooling mode only). |
🟡 Check the return air filter is clean, then book a service if it happens again. |
| P8 | The outdoor unit has cut out because it was drawing too much current. Outdoor unit overcurrent protection. |
🟡 Book a service. |
| L0 | The internal DC voltage has gone too high. DC overvoltage error. |
🟡 Book a service. |
| L1 | The compressor has drawn too much current on one of its phases. Compressor phase current overcurrent protection. |
🟡 Book a service. |
| L2 | The compressor motor lost sync with its drive electronics. Compressor lost step protection. |
🟡 Book a service. |
| L3 | One of the compressor's motor phases is faulty or disconnected. Compressor phase error. |
🟡 Book a service. |
| L4 | The power module that drives the compressor has a fault. Compressor drive module IPM fault. |
🟡 Book a service. |
| L5 | The power factor correction circuit tripped on overcurrent (hardware level). PFC overcurrent hardware protection. |
🟡 Book a service. |
| L6 | The power factor correction circuit tripped on overcurrent (software level). PFC overcurrent software protection. |
🟡 Book a service. |
| L7 | The current measuring circuit is giving abnormal readings. Current detection AD abnormal protection. |
🟡 Book a service. |
| LC | The PFC current measuring circuit is giving abnormal readings. PFC current detection AD abnormal protection. |
🟡 Book a service. |
| Ld | The fan motor current measuring circuit is giving abnormal readings. DC fan motor detection AD abnormal protection. |
🟡 Book a service. |
| L8 | The drive electronics have detected an internal measurement imbalance. Shunt resistance imbalance fault. |
🟡 Book a service. |
| L9 | The temperature sensor on the power module is faulty. IPM temperature sensor error. |
🟡 Book a service. |
| LA | The compressor is failing to start. Compressor startup failure. |
🔴 Switch the system off at the isolator and give us a call. |
| LE | One of the outdoor fan motor's phases is faulty or disconnected. DC fan motor phase error. |
🟡 Book a service. |
| LF | The outdoor fan motor lost sync with its drive electronics. DC fan motor lost step protection. |
🟡 Book a service. |
| LH | The power module that drives the outdoor fan has gone into protection. DC fan motor IPM protection. |
🟡 Book a service. |
Brivis gas ducted heaters – MPS and Auto EMS models (Networker NC-3 wall controller era)
Where the code shows: Networker wall controller (code number plus short text, with an alert beep on minor faults).
| Code | What it means | What to do |
|---|---|---|
| 30 | The heater's fan speed sensor is playing up, so the heater is running in a reduced safe mode. FAN_LIMP – main fan speed sensing signal fault. The Networker beeps; pressing Reset silences it. |
🟡 You can press Reset to stop the beeping and keep using the heater with reduced function in the meantime. Book a service. |
| 31 | A flame escaped the burner area during ignition and the heater has stepped in. ROLL_TERR – flame rollout detected during ignition. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 32 | The heater's stored settings couldn't be read – often after a power interruption – and have gone back to defaults. DATA_Err – parameter data error. |
🟡 Try switching the heater off at the power point or isolator for a minute, then back on. If the code returns, book a service so the settings can be checked. |
| 35 | The heater isn't getting a signal from its supply air temperature sensor, so it's running in a reduced safe mode. NO_SA-THM – supply air thermistor signal missing. |
🟡 You can keep using the heater in the meantime, though it may not perform at its best. Book a service. |
| 36 | The supply air sensor isn't warming up the way the heater expects, which usually means it's in the wrong spot or not reading right. BAdSA-THM – supply air thermistor did not reach 30 degrees C within 2 minutes of fan start. |
🟡 You can keep using the heater in the meantime, though it may not perform at its best. Book a service. |
| 37 | The fan speed sensor is giving a faulty signal. TACHO_Err – main fan speed sensor error. |
🟡 Book a service. |
| 40 | The heater got too hot around its return air side and is running the fan flat out to cool down. OHEAT_R-A – return air over-temperature switch tripped or circuit open. Clears itself once the condition is fixed. |
🔴 Switch the heater off and let it cool. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, call us. |
| 41 | The heater got too hot at its supply air outlet and is running the fan flat out to cool down. OHEAT_S-A – supply air over-temperature switch tripped or circuit open. |
🔴 Switch the heater off and let it cool. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, call us. |
| 42 | The supply air temperature climbed too high (often a duct or filter airflow problem) and the fan is running flat out to cool things down. OHEAT_THM – supply air thermistor over temperature (90 degrees C) or closed circuit. |
🔴 Switch the heater off and let it cool. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, call us. |
| 43 | The heater overheated, the cause has cleared, and it's finishing a cool-down fan run. OHCOOLDWN – shows during the 60-second maximum fan run after an over-temperature reset. Watch for a 40, 41 or 42 code on the next heating cycle. |
🔴 Let the fan finish its cool-down. Check the return air filter is clean and plenty of outlets or zones are open. If overheat codes keep appearing, switch the heater off and call us. |
| 44 | A flame escaped the burner area and the heater has shut the cycle down. ROLLOUT – flame rollout during operation. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 45 | The heater's internal low-voltage supply dipped – usually a brownout or power glitch. LOW24VOLT – 24V supply below threshold; can also point to a transformer problem. |
🟢 Switch the heater off at the isolator, wait a few minutes, then switch back on. If the code keeps returning, book a service. |
| 46 | The heater failed to light and is pausing before it tries again. IGN_RETRY – ignition attempt failed; common after a gas supply interruption or with empty LPG bottles. |
🔴 If your gas supply was recently off, or LPG bottles may be low, that's a common cause. If it keeps failing to light, switch the heater off and call us. |
| 50 | The heater tried to light four times without success and has locked itself out. IGN_LKOUT – ignition lockout after four failed attempts. |
🔴 Switch the heater off and give us a call. If your gas supply or LPG bottles were the problem, it will still need the lockout cleared safely. |
| 51 | The burner flame was lost while the heater was running. FLMS_LOSS – flame loss during operation (Auto EMS/MPS models). |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 52 | The heater sensed a flame at a time when there shouldn't be one, and has locked itself out. FLM_NOGAS – flame signal with no gas being supplied; points to the flame sensing circuitry or a real flame fault. |
🔴 Switch the heater off and give us a call straight away. |
| 53 | The heater overheated twice in quick succession and has locked itself out. OH_LKOUT – two over-temperature events within the 13-minute safeguard period. |
🔴 Switch the heater off and call us. Check the return air filter is clean and plenty of outlets or zones are open before the visit. |
| 54 | Flames escaped the burner area repeatedly and the heater has locked itself out. ROL_LKOUT – rollout lockout after consecutive rollout events. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 55 | The flame kept cutting out during ignition checks and the heater has locked itself out. IGNINVALD – flame lost during flame validation. |
🔴 Switch the heater off and give us a call. |
| 56 | The heater locked out on a fault and the power was then switched off and on – the original fault still needs attention. PowER_UPD – power interruption during a lockout. |
🔴 Switch the heater off and give us a call so the underlying fault can be found. |
| 60 | The heater's fan motor circuit has gone open – the motor isn't connected or has failed – and the heater has locked out. MOTOR_O-C – motor open circuit. |
🟡 Book a service. The heater won't run until it's repaired. |
| 61 | The heater's control board has locked out and isn't responding properly. 503_FAILI – control module (NG.lo) lockout; quick list notes 'computer board dead'. |
🟡 Book a service. If the heater won't reset, the control board likely needs replacement. |
| 62 | The heater's igniter isn't getting the power it needs, or has failed, and the heater has locked out. HSI_LOCK – hot surface igniter lockout; low voltage at the igniter or open circuit. |
🔴 Switch the heater off and give us a call. |
| 63 | The heater's control board has failed and locked the unit out. 503_FAILS – control module failure lockout. |
🟡 Book a service. The heater won't run until it's repaired. |
| 65 | The fan motor problem got worse (or combined with an overheat) and the heater has locked itself out. MTR_LKOUT – motor lockout; follows a fan limp fault plus a motor open circuit or overheat event. |
🟡 Book a service. The heater won't run until it's repaired. |
| 67 | The heater's control board tripped its internal watchdog and locked out. 503_WD – control module watchdog lockout; quick list notes a possible 2 amp fuse fault on the board. |
🟡 Book a service. |
| 68 | The heater has locked out because its thermostat circuit has gone open – a wiring link that should be in place isn't. NCCFG_Err – open circuit between the 24V and STAT terminals on the control module; a bridge link must remain intact. |
🟡 Book a service. |
| 69 | A fuse on the heater's control board has blown, usually because something wired to its 24 volt circuit has shorted. FUSE_BLOW – 2 amp fuse open circuit on the control module. |
🟡 Book a service. The heater won't run until it's repaired. |
| 70 | The heater's backup flame safety check failed and it has locked itself out. FSAFE_LOC – fail-safe lockout (flame sensing on MPS models). |
🔴 Switch the heater off and give us a call. |
| 71 | The heater's backup flame sensor failed its safety check and the unit has locked itself out. FSAFE_LOC – fail-safe lockout, backup burner sensor (MPS models). |
🔴 Switch the heater off and give us a call. |
Brivis gas ducted heaters – MPS and Starpro models (NG-1/NG-2 control modules)
Where the code shows: NC-7 wall controller and Rinnai Touch app (code, title and homeowner text); code also shows on the heater's control module.
Tap your code: 30313233353637404142434445464748495051525354555657586061626365666769707172737475767778808182838485868788
| Code | What it means | What to do |
|---|---|---|
| 30 | The fan speed sensor signal is wrong, so the heater is running in a reduced safe mode. FAN_LIMP – main fan speed sensing fault. May lock out if it persists. |
🟡 You can keep using the heater in the meantime. Book a service. |
| 31 | A flame escaped the burner area during ignition; the heater shut the cycle down and will retry. RoLL_TERR – flame rollout during ignition (AFRO bar earthed). Locks out if it persists. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 32 | The heater's stored settings couldn't be read and have gone back to defaults. DATA_Err – parameter data error; module reset is the first step, settings then need checking. |
🟡 Try switching the heater off at the isolator for a minute, then back on. If the code returns, book a service. |
| 33 | The heater isn't getting feedback from its gas valve control coil and is running in safe mode. MDGU_LIMP – gas valve modulating coil feedback not detected (Starpro). |
🔴 Switch the heater off and give us a call. |
| 35 | The supply air temperature sensor circuit is open or shorted, so the heater is running in safe mode. No_SA-THM – supply air thermistor fault. |
🟡 You can keep using the heater in the meantime, though it may not perform at its best. Book a service. |
| 36 | The supply air sensor never reached its expected temperature, which usually means it's fitted in the wrong spot. BAdSA-THM – supply air did not reach the set point (default 45 degrees C) within two minutes. |
🟡 You can keep using the heater in the meantime. Book a service. |
| 37 | The fan speed sensor is giving a faulty signal. TACHO_Err – fan speed sensor error (MPS). |
🟡 Book a service. |
| 40 | An over-temperature switch has tripped and the fan is running flat out to cool the heater down. OHEAT_R-A – combustion fan overheat switch open; interrupts gas valve power while tripped. |
🔴 Let the fan run and cool the unit. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, switch the heater off and call us. |
| 41 | The supply air over-temperature switch has tripped and the fan is running flat out to cool the heater down. OHEAT_S-A – supply air overheat switch open. |
🔴 Let the fan run and cool the unit. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, switch the heater off and call us. |
| 42 | The supply air temperature climbed past its safe limit and the heater is cooling itself down. OHEAT_THM – supply air thermistor over set limit. |
🔴 Let the fan run and cool the unit. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, switch the heater off and call us. |
| 43 | The overheat cause has cleared and the heater is finishing its cool-down fan run. OHCooLDwn – overheat cool-down completing; the trigger was a 40, 41 or 42 condition. |
🔴 Let the fan finish its cool-down. Check the return air filter is clean and plenty of outlets or zones are open. If overheat codes keep appearing, switch the heater off and call us. |
| 44 | A flame escaped the burner area during ignition; the heater shut the cycle down and will retry. RoLLOut – flame rollout during ignition. Locks out if it persists. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 45 | The heater's internal low-voltage supply dipped – usually a power loss or brownout – and it will try to restart. LOW24UOLT – 24Vac below threshold. |
🟢 Switch the heater off at the isolator, wait a few minutes, then switch back on. If the code keeps returning, book a service. |
| 46 | The heater failed to light within the allowed time and will try again; repeated failures lock it out. IGN_RETRY (MPS) / IGR_NOFLM (Starpro) – no flame detected during ignition. |
🔴 If your gas supply was recently off, or LPG bottles may be low, that's a common cause. If it keeps failing to light, switch the heater off and call us. |
| 47 | The flame keeps cutting out just after lighting; the heater will retry and locks out if it continues. IGR_BDFLM – unreliable flame signal during ignition (Starpro). |
🔴 Switch the heater off and give us a call. |
| 48 | The heater lost combustion pressure mid-cycle – often a flue or condensate drain problem – and will attempt a restart. LOST_PRES – combustion chamber pressure switch opened during the ON phase (Starpro). |
🔴 Switch the heater off and give us a call. |
| 49 | The burner flame was lost unexpectedly while the heater was running; it will attempt a restart. LOST_FLME – flame signal lost during normal operation (Starpro). |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 50 | The heater couldn't light after its maximum attempts and has locked itself out. IGN_LKOUT – ignition lockout; commonly gas supply related. |
🔴 Switch the heater off and give us a call. If your gas supply or LPG bottles were the problem, it will still need the lockout cleared safely. |
| 51 | On MPS heaters, the burner flame was lost while running. On Starpro heaters, a flame was detected by the rollout sensor when it shouldn't be there. FLMS_LOSS (MPS) / RLT_NOGAS (Starpro). |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 52 | The heater sensed a flame at a time when there shouldn't be one, and has locked itself out. FLM_NOGAS – flame detected with the unit off. |
🔴 Switch the heater off and give us a call straight away. |
| 53 | The heater overheated twice in quick succession after being turned off, and has locked itself out. OH_LKOUT – overheat lockout (two events within 13 minutes on MPS, 15 on Starpro). |
🔴 Switch the heater off and call us. Check the return air filter is clean and plenty of outlets or zones are open before the visit. |
| 54 | Flames escaped the burner area too many times and the heater has locked itself out for good measure. RoL_LKOUT – rollout lockout, no restart. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 55 | The flame kept cutting out during ignition checks and the heater has locked itself out. IGINUALID – flame lost within the validation window. |
🔴 Switch the heater off and give us a call. |
| 56 | On MPS heaters, power was cycled while the unit was locked out – the original fault still needs finding. On Starpro heaters, the combustion pressure switch failed to close and the unit locked out. PowER_UPD (MPS) / PRES_STOF (Starpro). |
🔴 Switch the heater off and give us a call. |
| 57 | The combustion pressure switch is stuck closed and the heater has locked itself out. PRES_STON (Starpro) – pressure switch detected closed with the combustion fan off. |
🔴 Switch the heater off and give us a call. |
| 58 | The heater lost combustion pressure too many times and has locked itself out. PRES_FAIL (Starpro) – pressure loss limit exceeded; flue or condensate drain problems are common causes. |
🔴 Switch the heater off and give us a call. |
| 60 | The heater's fan motor circuit has gone open – the motor isn't connected or has failed – and the heater has locked out. MOTOR_O-C – motor open circuit. |
🟡 Book a service. The heater won't run until it's repaired. |
| 61 | On MPS heaters, the control board has locked out. On Starpro heaters, the main gas valve relay failed to switch on and the unit locked out. 503_FAILI (MPS) / PUCR_STOF (Starpro – primary gas valve relay stuck off). |
🔴 Switch the heater off and give us a call. |
| 62 | On MPS heaters, the igniter has failed or lost power. On Starpro heaters, the main gas valve relay is stuck on. Either way the heater has locked out. HSI_LOCK (MPS) / PUCR_STON (Starpro). |
🔴 Switch the heater off and give us a call. |
| 63 | On MPS heaters, the control board has failed and locked out. On Starpro heaters, the main gas valve relay dropped out while it should have been on. 503-FAILS (MPS) / PUCR_FAIL (Starpro). |
🔴 Switch the heater off and give us a call. |
| 65 | A fan motor problem combined with an open circuit or overheat, and the heater has locked itself out. MTR_LKOUT – motor lockout (fan limp code 30 plus code 60 or an overheat). |
🟡 Book a service. The heater won't run until it's repaired. |
| 66 | The backup gas valve relay failed to switch on and the heater has locked out. SUCR_STOF (Starpro) – secondary gas valve relay stuck off. |
🔴 Switch the heater off and give us a call. |
| 67 | On MPS heaters, the control board tripped its watchdog. On Starpro heaters, the backup gas valve relay is stuck on. Either way the heater has locked out. 503_WD (MPS) / SUCR_STON (Starpro). |
🔴 Switch the heater off and give us a call. |
| 69 | A fuse on the heater's control board has blown, usually because something wired to its 24 volt circuit has shorted. FUSE_BLOW – 2 amp fuse blown by a short on the 24V wiring (damper motors, zone modules, thermostats). |
🟡 Book a service. The heater won't run until it's repaired. |
| 70 | On MPS heaters, the backup flame safety check failed. On Starpro heaters, the control board failed to shut a heating cycle down in time. Either way the heater has locked out. FSAFE_LOC (MPS) / SS-SDNERR (Starpro). |
🔴 Switch the heater off and give us a call. |
| 71 | On MPS heaters, the backup flame safety check failed. On Starpro heaters, the control board detected an invalid heating state. Either way the heater has locked out. FSaFE_LOC (MPS) / SS-STAERR (Starpro). |
🔴 Switch the heater off and give us a call. |
| 72 | The heater's control board failed an internal self-check and locked out. SS-TIMERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 73 | The heater's control board failed an internal self-check and locked out. SS-SNCERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 74 | The heater's control board failed an internal self-check and locked out. SS-CCSERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 75 | The heater's control board failed an internal self-check and locked out. SS-NOTRED (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 76 | The heater's control board failed an internal self-check and locked out. PS-SLKERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 77 | The heater's control board failed an internal self-check and locked out. PS-DATDFN (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 78 | The heater's control board failed an internal self-check and locked out. PS-UNKERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 80 | The heater's control board failed an internal self-check and locked out. PS-SDNERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 81 | The heater's control board failed an internal self-check and locked out. PS-STAERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 82 | The heater's control board failed an internal self-check and locked out. PS-TIMERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 83 | The heater's control board failed an internal self-check and locked out. PS-SNCERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 84 | The heater's control board failed an internal self-check and locked out. PS-CCSERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 85 | The heater's control board failed an internal self-check and locked out. PS_NOTRED (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 86 | The heater's control board failed an internal self-check and locked out. SS_SLKERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 87 | The heater's control board failed an internal communication check and locked out. SS_COMERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
| 88 | The heater's control board failed an internal self-check and locked out. SS-UNKERR (Starpro control board lockout). |
🟡 Book a service. The heater won't run until it's repaired. |
Brivis gas ducted heaters on the NG-3 control module platform
Where the code shows: wall controller / control module display (NG-3 fault list; some codes report from the primary microcontroller, some from the secondary, most from both).
Tap your code: 303233353640414243444546474849505152535455565758596061626364656667686970717273747576777879808182838789
| Code | What it means | What to do |
|---|---|---|
| 30 | The fan speed signal has read wrong for too long, so the heater is running in a reduced safe mode. Fan limp mode – main fan speed sensing fault. |
🟡 You can keep using the heater in the meantime. Book a service. |
| 32 | The heater's stored settings couldn't be read and have gone back to defaults. Data error – non-volatile parameter data restored to defaults. |
🟡 Try switching the heater off at the isolator for a minute, then back on. If the code returns, book a service. |
| 33 | The gas valve's control coil isn't responding even though the heater is driving it. Mod valve open circuit – no feedback current from the gas valve modulating coil. |
🔴 Switch the heater off and give us a call. |
| 35 | The supply air temperature sensor circuit is open or shorted. Supply air thermistor fault. |
🟡 You can keep using the heater in the meantime, though it may not perform at its best. Book a service. |
| 36 | The supply air sensor never reached its expected temperature, which usually means it's fitted in the wrong spot. Bad supply air thermistor location. |
🟡 You can keep using the heater in the meantime. Book a service. |
| 40 | The flue fan overheat switch has opened and the heater is cooling itself down. Return air overheat – flue fan overheat switch open. |
🔴 Let the fan run and cool the unit. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, switch the heater off and call us. |
| 41 | The supply air overheat switch has opened and the heater is cooling itself down. Supply air overheat. |
🔴 Let the fan run and cool the unit. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, switch the heater off and call us. |
| 42 | The supply air temperature climbed past its safe limit and the heater is cooling itself down. Supply air thermistor overheat. |
🔴 Let the fan run and cool the unit. Check the return air filter is clean and plenty of outlets or zones are open. If the code comes back, switch the heater off and call us. |
| 43 | The overheat cause has cleared and the heater is finishing its cool-down. Overheat cooldown completing. |
🔴 Let the fan finish its cool-down. Check the return air filter is clean and plenty of outlets or zones are open. If overheat codes keep appearing, switch the heater off and call us. |
| 44 | A flame escaped the burner area during ignition; the heater will retry unless it keeps happening. Roll out – flame rollout signal during ignition, retry limit not yet reached. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 45 | The heater's internal low-voltage supply dipped below its threshold. Low 24Vac. |
🟢 Switch the heater off at the isolator, wait a few minutes, then switch back on. If the code keeps returning, book a service. |
| 46 | The heater failed to light within the allowed time and will try again. No flame on ignition – retry limit not yet reached. |
🔴 If your gas supply was recently off, or LPG bottles may be low, that's a common cause. If it keeps failing to light, switch the heater off and call us. |
| 47 | The flame keeps cutting out just after lighting; the heater will retry. Unstable flame – flame lost during validation, retry limit not yet reached. |
🔴 Switch the heater off and give us a call. |
| 48 | The heater lost combustion pressure mid-cycle and will attempt a restart. Pressure lost – combustion chamber pressure switch opened, retry limit not yet reached. |
🔴 Switch the heater off and give us a call. |
| 49 | The burner flame was lost during a heating cycle. Flame lost. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 50 | The heater couldn't light after its maximum attempts and has locked itself out. Ignition lockout. |
🔴 Switch the heater off and give us a call. If your gas supply or LPG bottles were the problem, it will still need the lockout cleared safely. |
| 51 | The rollout sensor reported a flame when no gas was flowing – a problem with the sensing circuit – and the heater locked out. Rollout no gas. |
🔴 Switch the heater off and give us a call. |
| 52 | The heater sensed a flame when no gas was flowing – a problem with the flame sensing circuit – and locked out. Flame no gas. |
🔴 Switch the heater off and give us a call straight away. |
| 53 | The heater overheated too many times in a short period and has locked itself out. Overheat lockout. |
🔴 Switch the heater off and call us. Check the return air filter is clean and plenty of outlets or zones are open before the visit. |
| 54 | Flames escaped the burner area too many times and the heater has locked itself out. Rollout lockout. |
🔴 Switch the heater off and give us a call. Please don't keep resetting it. |
| 55 | The flame kept cutting out during ignition checks and the heater has locked itself out. Flame validation lockout. |
🔴 Switch the heater off and give us a call. |
| 56 | The combustion pressure switch failed to close with the flue fan running, and the heater locked out. Pressure switch stuck open. |
🔴 Switch the heater off and give us a call. |
| 57 | The combustion pressure switch is stuck closed and the heater has locked out. Pressure switch stuck closed. |
🔴 Switch the heater off and give us a call. |
| 58 | The heater lost combustion pressure too many times and has locked itself out. Pressure switch fail. |
🔴 Switch the heater off and give us a call. |
| 59 | The heater's two safety processors stopped agreeing with each other. Cross-check communications error between primary and secondary microcontrollers. |
🟡 Book a service. |
| 60 | The heater's fan motor circuit has gone open – the motor isn't connected or has failed. Motor open circuit – no zero cross detect signal. |
🟡 Book a service. The heater won't run until it's repaired. |
| 61 | The main gas valve relay failed to switch on and the heater locked out. Primary valve stuck off. |
🔴 Switch the heater off and give us a call. |
| 62 | The main gas valve relay is stuck on when it should be off, and the heater locked out. Primary valve stuck on. |
🔴 Switch the heater off and give us a call straight away. |
| 63 | The main gas valve relay dropped out during heating and the heater locked out. Primary valve fail. |
🔴 Switch the heater off and give us a call. |
| 64 | The gas valve's control coil drew more current than is ever allowed, and the heater locked out. Mod valve overcurrent – above 150mA for the fault time. |
🔴 Switch the heater off and give us a call. |
| 65 | A fan motor problem combined with an open circuit or overheat, and the heater has locked itself out. Motor lockout – fan limp plus motor open circuit or overheat cooldown. |
🟡 Book a service. The heater won't run until it's repaired. |
| 66 | The backup gas valve relay failed to switch on and the heater locked out. Secondary valve stuck off. |
🔴 Switch the heater off and give us a call. |
| 67 | The backup gas valve relay is stuck on when it should be off, and the heater locked out. Secondary valve stuck on. |
🔴 Switch the heater off and give us a call straight away. |
| 68 | The backup gas valve relay dropped out during heating and the heater locked out. Secondary valve fail. |
🔴 Switch the heater off and give us a call. |
| 69 | The heater's internal low-voltage supply has disappeared completely – most likely a blown fuse. Fuse blown – 24Vac lost, possibly the 2A fuse open circuit. |
🟡 Book a service. The heater won't run until it's repaired. |
| 70 | One of the heater's safety processors didn't shut the heating cycle down in time, so the unit locked out. Remote microcontroller shutdown fail. |
🟡 Book a service. The heater won't run until it's repaired. |
| 71 | The heater's two safety processors disagreed about what the unit was doing, so it locked out. Remote microcontroller state mismatch. |
🟡 Book a service. The heater won't run until it's repaired. |
| 72 | The heater detected a fault it couldn't attribute to a specific cause. Ambiguous fault – usually the remote microcontroller taking shutdown action the local one reads as a fault. |
🟡 Book a service. |
| 73 | The heater's two safety processors got out of step with each other, so it locked out. Remote microcontroller sequence error. |
🟡 Book a service. The heater won't run until it's repaired. |
| 74 | One safety processor found the other locked out, so the whole unit locked out. Remote microcontroller lockout. |
🟡 Book a service. The heater won't run until it's repaired. |
| 75 | One of the heater's low-voltage inputs is stuck in the on state. AC input scan fault – a 24Vac input stuck high. |
🟡 Book a service. |
| 76 | The heater can't reliably store its safety lockout records, so it has locked out. Lockout storage fault – non-volatile lockout data inaccessible. |
🟡 Book a service. The heater won't run until it's repaired. |
| 77 | The heater's two safety processors disagreed about the state of its inputs and outputs. Remote microcontroller IO mismatch. |
🟡 Book a service. The heater won't run until it's repaired. |
| 78 | The gas management system detected a fault it couldn't diagnose, and the heater locked out. Unknown fault. |
🔴 Switch the heater off and give us a call. |
| 79 | The heater's internal measurement circuit failed its self-check. A/D converter error – reference voltage check failed. |
🟡 Book a service. The heater won't run until it's repaired. |
| 80 | The flame sensing circuit is reading outside its allowed range, so the heater locked out. Flame sense fault. |
🔴 Switch the heater off and give us a call. |
| 81 | The flame rollout sensing circuit is reading outside its allowed range, so the heater locked out. Roll out sense fault. |
🔴 Switch the heater off and give us a call. |
| 82 | The heater's internal clock check against the mains frequency failed. System timing fault – MCU timing vs 50Hz cross-check failed. |
🟡 Book a service. The heater won't run until it's repaired. |
| 83 | The heater's processor hit an internal execution fault and locked out. System execution fault. |
🟡 Book a service. The heater won't run until it's repaired. |
| 87 | The heater's two safety processors haven't been able to talk to each other for more than ten seconds. Cross-check communications fault. |
🟡 Book a service. The heater won't run until it's repaired. |
| 89 | A factory test code that shouldn't appear in normal operation. Test fault – used to verify non-volatile lockout storage. |
🟡 Book a service. |
Rinnai and Brivis shared several ranges after 2016. If your unit is badged Rinnai or your code is not listed here, check the Rinnai fault codes page too.
Code still showing after a reset? Mention the code and your system type when you book and our office can line up the right technician and likely parts before we arrive.
Book a service or call (02) 4760 0100 (24-hour line, Penrith & Blue Mountains).
Codes vary between models and generations, and manufacturers revise them. This guide is compiled from official service documentation and checked by Ample Air, but it is general information, not a diagnosis. Refrigerant and electrical work must be carried out by licensed technicians. Ample Air, ARC licences AU12976 & AU15788. Last verified August 2026.