When your Rinnai 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.
R32 ducted
Where the code shows: Engineer/service mode eraror readout (source doc is headed 'Error code of engineer mode' and does not state the panel; likely the wall controller's diagnostic display).
Tap your code: EH 00EL 01EH bAEH 30EH 35EH 36EH 37EH 38EH 39EH 3AEH 3bEH 3EEH 3FEH 03EC 51EC 52EC 53EC 54EC 55EC 0dEH 60EH 61EC 71EC 72EC 75EC 74EC 73EC 07EL 0CEH 0bEH 0EEH 0FPC 00PC 10PC 11PC 12PC 02PC 40PC 41PC 42PC 43PC 44PC 45PC 46PC 49PC 06PC 08PH 09PC 0FPC 30PC 31PC 03PC 0LPH 90PH 91PC 0APH 0CLH 00LH 30LH 31LC 01LC 02LC 05LC 03LC 06LC 30LC 31LH 07—
| Code | What it means | What to do |
|---|---|---|
| EH 00 | The indoor unit's control board has lost or corrupted its stored settings. Indoor unit EEPROM parameter error. The source shows a second display form for the same fault, EH 0A (OCR read 'EH OR'; confirmed against the platform table). |
🟡 Safe to try one power-cycle at the isolator (off, wait 20 to 30 minutes, back on). If the code returns, book a service. |
| EL 01 | The indoor and outdoor units have stopped talking to each other. Indoor/outdoor unit communication error. |
🟢 Power-cycle at the isolator: switch off, wait 20 to 30 minutes, switch back on. Very common after a blackout or power glitch. If the code comes back, book a service. |
| EH bA | The indoor unit and its fan module have stopped talking to each other. Communication error between the indoor unit and the indoor external fan module. |
🟡 Safe to power-cycle at the isolator once (off, 20 to 30 minutes, on). If the code returns, book a service. |
| EH 30 | The indoor fan module's stored settings don't check out. Parameter error of the indoor external fan module. |
🟡 Book a service. A single power-cycle at the isolator (off, 20 to 30 minutes, on) is safe to try first. |
| EH 35 | The indoor fan motor has lost one of its electrical phases. Phase failure of the indoor external fan. |
🟡 Book a service. This is a fan motor or board fault a technician needs to test. |
| EH 36 | The indoor fan's current reading is off, so the system can't trust what the fan motor is drawing. Indoor external fan current sampling bias fault. |
🟡 Book a service. |
| EH 37 | The indoor fan isn't turning even though it's being told to run. Indoor external fan zero speed failure. |
🟡 Book a service. A power-cycle at the isolator is safe to try once, but a fan that won't spin usually needs a technician. |
| EH 38 | The indoor fan has jammed or stalled while running. Indoor external fan stall failure. |
🟡 Book a service. |
| EH 39 | The indoor fan motor has fallen out of sync with its drive signal. Out-of-step failure of the indoor external fan. |
🟡 Book a service. |
| EH 3A | The power supply feeding the indoor fan module dropped too low, so the system shut the fan down to protect it. Low voltage protection on the indoor external fan DC bus. |
🟡 Safe to power-cycle at the isolator once (off, 20 to 30 minutes, on), especially after a brownout. If it returns, book a service. |
| EH 3b | The power supply feeding the indoor fan module spiked too high, so the system shut the fan down to protect it. Indoor external fan DC bus over-voltage fault. |
🟡 Safe to power-cycle at the isolator once. If it returns, book a service. |
| EH 3E | The indoor fan drew more current than it should, so the system cut it out. Indoor external fan overcurrent fault. |
🟡 Book a service. |
| EH 3F | The electronics module that drives the indoor fan tripped its own protection. Indoor external fan module protection / hardware overcurrent protection. |
🟡 Book a service. |
| EH 03 | The indoor fan is running well outside its normal speed range. Indoor fan speed out of normal range. Equivalent fault family to E3 on the D-series. |
🟡 Safe to power-cycle at the isolator once (off, 20 to 30 minutes, on). If the code comes back, book a service, as this is usually a fan motor or board issue. |
| EC 51 | The outdoor unit's control board has lost or corrupted its stored settings. Outdoor unit EEPROM parameter error. |
🟡 Safe to try one power-cycle at the isolator. If the code returns, book a service. |
| EC 52 | The outdoor coil's temperature sensor isn't reading properly (open or short circuit). Condenser coil temperature sensor T3 open or short circuit. |
🟡 Book a service. Sensor faults need a technician to test and replace the sensor. |
| EC 53 | The outdoor air temperature sensor isn't reading properly. Outdoor ambient temperature sensor T4 open or short circuit. |
🟡 Book a service. |
| EC 54 | The sensor watching the compressor's outlet temperature isn't reading properly. Compressor discharge temperature sensor TP open or short circuit. |
🟡 Book a service. |
| EC 55 | The temperature sensor on the outdoor unit's power electronics isn't reading properly. IGBT temperature sensor TH open or short circuit. |
🟡 Book a service. |
| EC 0d | The outdoor unit has reported a general fault without a more specific code. Outdoor unit malfunction (generic). |
🟡 Safe to power-cycle at the isolator once. If the code returns, book a service. |
| EH 60 | The indoor (room air) temperature sensor isn't reading properly. Indoor room temperature sensor T1 open or short circuit. |
🟡 Book a service. |
| EH 61 | The indoor coil temperature sensor isn't reading properly. Evaporator coil temperature sensor T2 open or short circuit. |
🟡 Book a service. |
| EC 71 | The outdoor fan drew more current than it should, so the system cut it out. Outdoor external fan overcurrent fault. |
🟡 Book a service. |
| EC 72 | The outdoor fan motor has lost one of its electrical phases. Outdoor external fan phase failure. |
🟡 Book a service. |
| EC 75 | The electronics module that drives the outdoor fan tripped its own protection. Outdoor external fan module protection / hardware overcurrent protection. |
🟡 Book a service. |
| EC 74 | The outdoor fan's current reading is off, so the system can't trust what the fan motor is drawing. Outdoor external fan current sampling bias fault. |
🟡 Book a service. |
| EC 73 | The outdoor fan isn't turning even though it's being told to run. Zero speed failure of the outdoor DC fan. |
🟡 Book a service. It is worth checking nothing has fallen against the outdoor fan grille, but don't reach inside it. |
| EC 07 | The outdoor fan is running well outside its normal speed range. Outdoor fan speed out of normal range. |
🟡 Check the outdoor unit isn't smothered by leaves, covers or stored items, then book a service if the code stays. |
| EL 0C | The system thinks it has lost refrigerant. Refrigerant leak detection fault. R32 systems shut themselves down as a precaution when this trips. |
🔴 Switch the system off at the isolator and call us. Don't keep running it with a suspected refrigerant leak. |
| EH 0b | Two chips on the indoor unit's own electronics have stopped talking to each other. Communication error between the two indoor unit chips (main board and display/secondary processor). |
🟡 Safe to power-cycle at the isolator once. If the code returns, book a service, as this is usually a board fault. |
| EH 0E | The condensate water level inside the indoor unit is too high, usually a drainage problem. Water-level alarm malfunction (float switch / drain). |
🟡 Book a service. Blocked drains and failed condensate pumps are the usual culprits and can leak water if ignored. |
| EH 0F | The occupancy ('intelligent eye') sensor has failed. Intelligent eye malfunction. Feature may not be fitted to all ducted models. |
🟡 Book a service. The system usually keeps heating and cooling normally in the meantime. |
| PC 00 | The inverter power module in the outdoor unit tripped its protection, often from a current spike. IPM malfunction or IGBT over-strong current protection. |
🟡 Safe to power-cycle at the isolator once (off, 20 to 30 minutes, on). If the code comes back, book a service. |
| PC 10 | The incoming power dipped too low, so the outdoor unit shut down to protect itself. Under-voltage (over-low voltage) protection. |
🟡 Safe to power-cycle at the isolator once the power supply seems steady again. If it keeps tripping without any obvious power problems, book a service. |
| PC 11 | The incoming power spiked too high, so the outdoor unit shut down to protect itself. Over-voltage protection. |
🟡 Safe to power-cycle at the isolator once the power supply seems steady again. If it keeps tripping, book a service. |
| PC 12 | The outdoor unit's internal DC voltage went out of range and tripped protection. DC (bus) voltage protection. |
🟡 Safe to power-cycle at the isolator once. If the code returns, book a service. |
| PC 02 | The compressor or its power module got too hot and the system shut down to protect it. Compressor top temperature protection or IPM module high temperature protection. |
🔴 Switch the system off at the isolator and call us. Running it while it overheats risks compressor damage. |
| PC 40 | The outdoor unit's main processor and its compressor drive processor have stopped talking to each other. Communication error between the outdoor main chip and the compressor drive chip. |
🟡 Safe to power-cycle at the isolator once. If the code returns, book a service. |
| PC 41 | The outdoor unit's current-monitoring circuit reported a problem. Current input detection protection. |
🟡 Book a service. |
| PC 42 | The compressor failed to start when asked. Compressor start error. |
🟡 Safe to power-cycle at the isolator once. If the compressor still won't start, book a service. |
| PC 43 | On three-phase models, one of the incoming power phases is missing. Lack of phase (three-phase) protection. |
🟡 Book a service. If other three-phase equipment on the property is also playing up, mention it, as the supply itself may be the issue. |
| PC 44 | The outdoor unit detected the compressor at zero speed when it should be turning. Outdoor unit zero speed protection. |
🟡 Book a service. |
| PC 45 | A fault in the drive circuitry that controls the compressor. Listed in the source as '341 PWM error' (compressor drive chip PWM fault). |
🟡 Book a service. |
| PC 46 | The compressor is running at the wrong speed. Compressor speed malfunction. |
🟡 Book a service. |
| PC 49 | The compressor drew more current than it safely should, so the system shut it down. Compressor overcurrent protection. |
🟡 Check the outdoor unit has clear airflow around it, try one power-cycle at the isolator, and book a service if the code returns. |
| PC 06 | The refrigerant leaving the compressor got too hot, so the system shut down to protect itself. Compressor discharge temperature protection. Can point to low refrigerant charge or a system restriction. |
🔴 Switch the system off at the isolator and call us. Repeated overheat trips can damage the compressor. |
| PC 08 | The outdoor unit drew more current overall than it safely should. Outdoor current (overload) protection. Same fault family as F0 on D-series/DRCi. |
🟡 Check the outdoor unit has clear space and airflow, try one power-cycle at the isolator, and book a service if the code returns. |
| PH 09 | Not a fault: in heating, the unit holds the fan back until the coil is warm so it doesn't blow cold air at you. Anti-cold-air function in heating mode. |
🟢 No action needed. This is normal start-up behaviour in heating, and the fan will ramp up once the coil warms. |
| PC 0F | The power-factor-correction module in the outdoor unit has a fault. PFC module malfunction. |
🟡 Book a service. |
| PC 30 | The refrigerant pressure climbed too high and the system shut down to protect itself. System over-pressure protection. |
🔴 Switch the system off at the isolator and call us. It is fine to check nothing is smothering the outdoor unit, but don't keep restarting it. |
| PC 31 | The refrigerant pressure dropped too low, which often points to lost refrigerant. System low-pressure protection. |
🔴 Switch the system off at the isolator and call us. Low pressure usually means a leak that needs finding and fixing. |
| PC 03 | A refrigerant pressure switch tripped and shut the system down. Pressure protection (the source doesn't specify high or low side). |
🔴 Switch the system off at the isolator and call us. |
| PC 0L | It's too cold outside for the unit to run safely, so it's holding itself off. Outdoor low ambient temperature protection. |
🟢 Usually no action needed. The unit protects itself in extreme cold and resumes when conditions improve. If it stays locked out in mild weather, book a service. |
| PH 90 | The indoor coil got too hot in heating, most often because airflow through the unit is restricted. Evaporator coil over-temperature protection (high). |
🟢 Clean or check the return air filter and make sure supply vents are open and unblocked. If the code keeps coming back with clean filters, book a service. |
| PH 91 | The indoor coil got too cold in cooling and the system stopped to avoid icing up. Evaporator coil low-temperature (anti-freeze) protection. Restricted airflow or low refrigerant are common causes. |
🟡 Clean or check the return air filter first. If the code returns with a clean filter, book a service, as low refrigerant can cause the same symptom. |
| PC 0A | The outdoor coil got too hot, usually an airflow problem at the outdoor unit. Condenser high temperature protection. |
🟢 Clear leaves, covers and stored items away from the outdoor unit so air can move through it freely, then power-cycle at the isolator. If the code returns, book a service. |
| PH 0C | The indoor unit's humidity sensor has failed. Indoor unit humidity sensor failure. |
🟡 Book a service. Heating and cooling usually keep working, but dehumidify/comfort features may misbehave. |
| LH 00 | Not a fault: the system is deliberately limiting compressor speed because of the indoor coil temperature. Frequency limit caused by T2 (indoor coil sensor). |
🟢 No action needed in most cases, the system is pacing itself. If comfort drops, check the return air filter is clean, and book a service if it keeps happening. |
| LH 30 | Not a fault: the system is limiting the indoor fan because its current was getting high. Indoor external fan current limit. |
🟢 No action needed in most cases. If airflow seems weak, check the return air filter is clean, and book a service if it persists. |
| LH 31 | Not a fault: the system is limiting the indoor fan because of its supply voltage. Indoor external fan voltage limit. |
🟢 No action needed in most cases. Book a service if it keeps happening or comfort drops. |
| LC 01 | Not a fault: the system is limiting compressor speed because of the outdoor coil temperature. Frequency limit caused by T3 (outdoor coil sensor). |
🟢 No action needed in most cases. If cooling or heating feels weak, make sure the outdoor unit has clear airflow, and book a service if it persists. |
| LC 02 | Not a fault: the system is limiting compressor speed because the compressor discharge was running hot. Frequency limit caused by TP (compressor discharge sensor). |
🟢 No action needed in most cases. If it happens constantly, book a service, as it can hint at a refrigerant issue. |
| LC 05 | Not a fault: the system is limiting compressor speed because of the supply voltage. Frequency limit caused by voltage. |
🟢 No action needed in most cases. Book a service if it keeps happening. |
| LC 03 | Not a fault: the system is limiting compressor speed because of the current it was drawing. Frequency limit caused by current. |
🟢 No action needed in most cases. Book a service if it keeps happening. |
| LC 06 | Not a fault: the system is limiting compressor speed because of the power-factor-correction circuit. Frequency limit caused by PFC. |
🟢 No action needed in most cases. Book a service if it keeps happening. |
| LC 30 | Not a fault: the system is limiting compressor speed because refrigerant pressure was climbing high. Frequency limit caused by high pressure. |
🟢 Make sure the outdoor unit has clear space and airflow and the return air filter is clean. If it keeps happening, book a service. |
| LC 31 | The system is limiting compressor speed because refrigerant pressure is running low. Frequency limit caused by low pressure. Persistent low pressure can point to lost refrigerant. |
🟡 If this shows up repeatedly or the system isn't keeping up, book a service. Checking refrigerant levels is work for a licensed technician. |
| LH 07 | Not a fault: the controller has told the system to cap its output (for example a quiet or limit setting). Frequency limit caused by the remote controller. |
🟢 Check the controller for quiet, eco or capacity-limit settings if you weren't expecting reduced output. Otherwise no action needed. |
| — | Two indoor units on the same outdoor unit are asking for opposite modes (one heating, one cooling), so one of them is waiting. Indoor unit mode conflict. Only applies to multi-outdoor-unit / multi-indoor configurations; the table shows the display as dashes. |
🟢 Set the affected controllers to the same mode. Once the modes agree, both units run normally. |
D-series
Where the code shows: Indoor unit display (two-character code) plus operation/timer lamp flash patterns on the indoor unit.
| Code | What it means | What to do |
|---|---|---|
| E0 | The indoor unit's control board has lost or corrupted its stored settings. Indoor unit EEPROM parameter error. Lamp pattern: operation lamp flashes once, timer lamp off. |
🟡 Safe to try one power-cycle at the isolator (off, wait 20 to 30 minutes, back on). If the code returns, book a service. |
| E1 | The indoor and outdoor units have stopped talking to each other. Indoor/outdoor unit communication error. Lamp pattern: operation lamp flashes twice, timer lamp off. |
🟢 Power-cycle at the isolator: switch off, wait 20 to 30 minutes, switch back on. Very common after a blackout. If the code comes back, book a service. |
| E3 | The indoor fan isn't running at the speed it should, and the unit has stopped to protect itself. Indoor fan speed out of control. Trips when fan speed stays too low (around 300 RPM) for a set time. Causes include wiring, fan assembly, fan motor or PCB. Lamp pattern: operation lamp flashes 4 times, timer lamp off. |
🟡 Safe to power-cycle at the isolator once (the manual's own first step is powering off and back on after a couple of minutes). If E3 comes back, book a service, as it usually means a fan motor or board fault. |
| E4 | The indoor (room air) temperature sensor isn't reading properly. Room temperature sensor T1 open or short circuit. Lamp pattern: operation lamp flashes 5 times, timer lamp off. |
🟡 Book a service. |
| E5 | The indoor coil temperature sensor isn't reading properly. Evaporator coil temperature sensor T2 open or short circuit. Lamp pattern: operation lamp flashes 6 times, timer lamp off. |
🟡 Book a service. |
| EC | The system thinks it has lost refrigerant. Refrigerant leakage detection. Lamp pattern: operation lamp flashes 7 times, timer lamp off. |
🔴 Switch the system off at the isolator and call us. Don't keep running it with a suspected refrigerant leak. |
| F0 | The outdoor unit drew more current than it safely should, so the system shut down to protect itself. Overload current protection. Same fault family as the DRCi F0: technician checks cover supply voltage, wiring, bridge rectifier, dirty outdoor coil, outdoor fan operation, refrigerant overcharge and the outdoor PCB. Lamp pattern: operation lamp flashes once, timer lamp on. |
🟡 After a power glitch, a power-cycle at the isolator is safe to try (off, 20 to 30 minutes, on). Make sure the outdoor unit has clear space and airflow. If F0 keeps returning, book a service. |
| F1 | The outdoor air temperature sensor isn't reading properly. Outdoor ambient temperature sensor T4 open or short circuit. Lamp pattern: operation lamp flashes twice, timer lamp on. |
🟡 Book a service. |
| F2 | The outdoor coil temperature sensor isn't reading properly. Condenser coil temperature sensor T3 open or short circuit. Lamp pattern: operation lamp flashes 3 times, timer lamp on. |
🟡 Book a service. |
| F3 | The sensor watching the compressor's outlet temperature isn't reading properly. Compressor discharge temperature sensor T5 open or short circuit. Lamp pattern: operation lamp flashes 4 times, timer lamp on. |
🟡 Book a service. |
| F4 | The outdoor unit's control board has lost or corrupted its stored settings. Outdoor unit EEPROM parameter error. Lamp pattern: operation lamp flashes 5 times, timer lamp on. |
🟡 Safe to try one power-cycle at the isolator. If the code returns, book a service. |
| F5 | The outdoor fan isn't running at the speed it should. Outdoor fan speed out of control. Shares the E3 troubleshooting flow (power-cycle first, then fan motor/PCB checks). Lamp pattern: operation lamp flashes 6 times, timer lamp on. |
🟡 Check nothing is resting against or covering the outdoor unit, try one power-cycle at the isolator, and book a service if the code returns. |
| P0 | The inverter power module in the outdoor unit tripped its protection, often from a current spike. IPM malfunction or IGBT over-strong current protection. Lamp pattern: operation lamp flashes once, timer lamp flashing. |
🟡 Safe to power-cycle at the isolator once. If the code comes back, book a service. |
| P1 | The incoming power went too high or too low, so the system shut down to protect itself. Over-voltage or under-voltage protection. Lamp pattern: operation lamp flashes twice, timer lamp flashing. |
🟡 Common after brownouts and blackouts. Once the power seems steady, power-cycle at the isolator. If it keeps tripping, book a service. |
| P2 | The compressor or its power module got too hot and the system shut down to protect it. High temperature protection of the IPM module or compressor top. Lamp pattern: operation lamp flashes 3 times, timer lamp flashing. |
🔴 Switch the system off at the isolator and call us. Running it while it overheats risks compressor damage. |
| P4 | The electronics that drive the compressor reported a fault. Inverter compressor drive error. Lamp pattern: operation lamp flashes 5 times, timer lamp flashing. (No P3 is listed in the source table.) |
🟡 Safe to power-cycle at the isolator once. If the code returns, book a service. |
DRCi
Where the code shows: Failure code shown on the LED display (the service doc references the LED readout; it does not name the panel).
Tap your code: F0
| Code | What it means | What to do |
|---|---|---|
| F0 | The outdoor unit drew more current than its safe limit, so the system shut down to protect the compressor. Outdoor current limit / compressor current protection. Service flowchart checks: supply voltage and L-N wiring, bridge rectifier, PFC module and reactor, dirty outdoor heat exchanger, outdoor fan operation, refrigerant overcharge, outdoor PCB. Can also trip in extreme heat (outdoor ambient above 50 degrees C), where the doc's advice is simply to stop the unit until it cools. |
🟡 After a blackout or power glitch, power-cycle at the isolator (off, wait 20 to 30 minutes, on) once the supply is steady. Keep the outdoor unit clear of leaves, covers and stored items so it can breathe. If F0 keeps coming back, book a service. |
Rinnai and Brivis shared several ranges after 2016. If your unit is badged Brivis or your code is not listed here, check the Brivis 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.