When your Haier 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.
HEK & N series wall splits
Where the code shows: E-codes on the indoor display panel; outdoor faults also shown as LED1 flash counts on the outdoor PCB..
| Code | What it means | What to do |
|---|---|---|
| E7 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication fault. Indoor display shows E7; outdoor LED1 flashes 15 times. Haier's E7 guide has the technician check the interconnect cable, active/neutral wiring and the comms wire; if the unit runs about 4 minutes before faulting it points to the indoor PCB; with outdoor LED2 on the cause is the outdoor or indoor PCB, with LED2 off the outdoor PCB or power module. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| E1 | The indoor unit's room temperature sensor isn't reading properly. Room temperature sensor failure. |
🟡 Book a service call – this one needs a technician. |
| E2 | The indoor coil's temperature sensor isn't reading properly. Heat-exchange sensor failure. |
🟡 Book a service call – this one needs a technician. |
| E4 | The indoor unit's control board has a memory fault. Indoor EEPROM error. |
🟡 Book a service call – this one needs a technician. |
| E14 | The indoor fan motor isn't running properly. Indoor fan motor malfunction. |
🟡 Book a service call – this one needs a technician. |
| F12 | The outdoor unit's control board has a memory fault. Outdoor EEPROM error. Outdoor LED1 flashes 1 time. |
🟡 Book a service call – this one needs a technician. |
| F1 | The outdoor unit's inverter power module tripped to protect itself. Power module (IPM) protection – over-current or short circuit. Outdoor LED1 flashes 2 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F22 | The outdoor unit shut down because it drew too much electrical current. AC over-current protection. Outdoor LED1 flashes 3 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F3 | Two boards inside the outdoor unit (power module and main PCB) have lost communication. Power module to outdoor PCB communication fault. Outdoor LED1 flashes 4 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F19 | The incoming power supply voltage is too high or too low. Power voltage out of range. Outdoor LED1 flashes 6 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F4 | The compressor got too hot and the unit shut down to prevent damage. Discharge temperature overheat protection – can point to low refrigerant. Outdoor LED1 flashes 8 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F8 | The outdoor fan motor isn't running properly. Outdoor DC fan motor fault. Outdoor LED1 flashes 9 times. |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| F21 | The outdoor defrost temperature sensor isn't reading properly. Defrost temperature sensor failure. Outdoor LED1 flashes 10 times. |
🟡 Book a service call – this one needs a technician. |
| F7 | The outdoor suction temperature sensor isn't reading properly. Suction temperature sensor failure. Outdoor LED1 flashes 11 times. |
🟡 Book a service call – this one needs a technician. |
| F6 | The outdoor air temperature sensor isn't reading properly. Ambient temperature sensor failure. Outdoor LED1 flashes 12 times. |
🟡 Book a service call – this one needs a technician. |
| F25 | The compressor discharge temperature sensor isn't reading properly. Discharge temperature sensor failure. Outdoor LED1 flashes 13 times. |
🟡 Book a service call – this one needs a technician. |
| F11 | The compressor isn't running the way the controller expects. Compressor running abnormal / loss of synchronism. Outdoor LED1 flashes 18 times. |
🟡 Book a service call – this one needs a technician. |
| F28 | The circuit that tracks the compressor's rotor position has a fault. Compressor loss-of-synchronism / position detection error. Outdoor LED1 flashes 19 times. |
🟡 Book a service call – this one needs a technician. |
| F2 | The compressor drew too much current and the unit shut down. Compressor over-current. Outdoor LED1 flashes 24 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F23 | The compressor drew too much current on one phase and the unit shut down. Single-phase compressor over-current protection. Outdoor LED1 flashes 25 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| E9 | The indoor unit overheated while heating and shut down to protect itself. Indoor overload in heating mode – restricted airflow is a common cause; parts list also mentions indoor pipe sensor and refrigerant. Outdoor LED1 flashes 21 times. |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
T series wall splits (LED flash patterns)
Where the code shows: Three indoor LEDs – Power/Timer/Operation (labelled Operation/Heat/Cool on some models) – read as pattern ON / FLASH / OFF in that order; outdoor faults also shown as LED1 flash counts on the outdoor PCB..
Tap your code: E1E2F21F25E9 / E5F6E7FLASH-OFF-ON (indoor LEDs)OFF-FLASH-OFF (indoor LEDs)F22FLASH-FLASH-ON (indoor LEDs)F1E9F24E4E14
| Code | What it means | What to do |
|---|---|---|
| E1 | The indoor unit's room temperature sensor isn't reading properly. Indoor LEDs (Power/Timer/Operation): FLASH-OFF-OFF. |
🟡 Book a service call – this one needs a technician. |
| E2 | The indoor pipe temperature sensor isn't reading properly. Indoor LEDs: FLASH-ON-ON. |
🟡 Book a service call – this one needs a technician. |
| F21 | The outdoor defrost temperature sensor isn't reading properly. Indoor LEDs: ON-ON-FLASH. Outdoor LED1 flashes 10 times. |
🟡 Book a service call – this one needs a technician. |
| F25 | The compressor discharge (exhaust) temperature sensor isn't reading properly. Indoor LEDs: FLASH-ON-OFF. Outdoor LED1 flashes 13 times. |
🟡 Book a service call – this one needs a technician. |
| E9 / E5 | The indoor unit shut down to protect itself – overheating in heating mode, or icing up in cooling mode. Indoor heating overload or anti-freeze protection. Indoor LEDs: ON-OFF-FLASH. Outdoor LED1 flashes 20 or 21 times. |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| F6 | The outdoor air temperature sensor isn't reading properly. Indoor LEDs: ON-FLASH-OFF. Outdoor LED1 flashes 12 times. |
🟡 Book a service call – this one needs a technician. |
| E7 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication fault. Indoor display shows E7; outdoor LED1 flashes 15 times. Haier's E7 guide has the technician check the interconnect cable, active/neutral wiring and the comms wire; if the unit runs about 4 minutes before faulting it points to the indoor PCB; with outdoor LED2 on the cause is the outdoor or indoor PCB, with LED2 off the outdoor PCB or power module. Indoor LEDs: OFF-OFF-FLASH. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| FLASH-OFF-ON (indoor LEDs) | The compressor isn't running the way the controller expects. Compressor running abnormal – the table lists a blocked compressor or power module fault as causes; no display code is assigned. |
🟡 Book a service call – this one needs a technician. |
| OFF-FLASH-OFF (indoor LEDs) | The outdoor unit has a fault – the outdoor unit's LED1 flash count identifies which one. Grouped 'other error' display covering F12, F3, F27, F7, F11, F28, F43 and F4 (outdoor LED1 flashes 1, 4, 7, 11, 18, 19, 46 or 8 times). |
🟡 Book a service call – this one needs a technician. |
| F22 | The unit shut down because it drew too much electrical current. AC over-current protection. Indoor LEDs: FLASH-FLASH-OFF. Outdoor LED1 flashes 3 times. Causes listed: overcharged refrigerant, supply voltage under 187 V, power module or outdoor PCB fault. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| FLASH-FLASH-ON (indoor LEDs) | The unit shut down on a DC over-current trip. DC over-current protection – blocked compressor, power module fault, or supply voltage outside 187-242 V; no display code is assigned. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F1 | The inverter power module overheated and the unit shut down to protect itself. Power module overheat (IPM protection). Indoor LEDs: ON-FLASH-FLASH. Outdoor LED1 flashes 2 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| E9 | The indoor unit overheated while heating and shut down to protect itself. Indoor overload in heating. Indoor LEDs: FLASH-FLASH-FLASH. |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| F24 | The compressor is drawing abnormal running current. Compressor running current abnormal. Indoor LEDs: FLASH-OFF-FLASH. Outdoor LED1 flashes 27 times. Causes listed: outdoor PCB fault, low refrigerant charge, four-way valve fault. |
🟡 Book a service call – this one needs a technician. |
| E4 | The indoor unit's control board has a fault. Indoor PCB fault. Indoor LEDs: FLASH-ON-FLASH. |
🟡 Book a service call – this one needs a technician. |
| E14 | The indoor fan motor isn't running properly. Indoor fan motor fault. Indoor LEDs: OFF-ON-FLASH. |
🟡 Book a service call – this one needs a technician. |
DAC models – complete outdoor LED flash list (source header: 'not in any manual')
Where the code shows: Outdoor PCB LED flash counts; matching E/F code shows on indoor displays that have one..
| Code | What it means | What to do |
|---|---|---|
| F12 | The outdoor unit's control board has a memory fault. Outdoor EEPROM faulty. Outdoor LED flashes 1 time. |
🟡 Book a service call – this one needs a technician. |
| F1 | The inverter power module tripped on over-current or a short circuit. IPM over-current or short circuit. Outdoor LED flashes 2 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F22 | The outdoor unit shut down because it drew too much electrical current. AC over-current protection. Outdoor LED flashes 3 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F3 | Two boards inside the outdoor unit (module and main PCB) have lost communication. Module-to-outdoor-PCB communication failure. Outdoor LED flashes 4 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F20 | The compressor overloaded and the unit shut down to protect it. Compressor overload. Outdoor LED flashes 5 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F19 | The incoming power supply voltage is too high or too low. Supply voltage out of range. Outdoor LED flashes 6 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F27 | The compressor has stalled or its current-monitoring circuit has failed. Compressor current sampling circuit fault; compressor blocked or stopped. Outdoor LED flashes 7 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F4 | The compressor got too hot and the unit shut down to prevent damage. Discharge temperature overheating. Outdoor LED flashes 8 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F8 | The outdoor fan motor isn't running properly. DC fan motor malfunction. Outdoor LED flashes 9 times. |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| F21 | The outdoor defrost temperature sensor isn't reading properly. Defrost sensor malfunction. Outdoor LED flashes 10 times. |
🟡 Book a service call – this one needs a technician. |
| F7 | The compressor suction temperature sensor isn't reading properly. Suction sensor malfunction. Outdoor LED flashes 11 times. |
🟡 Book a service call – this one needs a technician. |
| F6 | The outdoor air temperature sensor isn't reading properly. Ambient sensor malfunction. Outdoor LED flashes 12 times. |
🟡 Book a service call – this one needs a technician. |
| F25 | The compressor discharge temperature sensor isn't reading properly. Discharge sensor malfunction. Outdoor LED flashes 13 times. |
🟡 Book a service call – this one needs a technician. |
| F30 | The outdoor suction temperature climbed too high. Outdoor suction temp overtop. Outdoor LED flashes 14 times. |
🟡 Book a service call – this one needs a technician. |
| E7 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication fault. Indoor display shows E7; outdoor LED1 flashes 15 times. Haier's E7 guide has the technician check the interconnect cable, active/neutral wiring and the comms wire; if the unit runs about 4 minutes before faulting it points to the indoor PCB; with outdoor LED2 on the cause is the outdoor or indoor PCB, with LED2 off the outdoor PCB or power module. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F13 | The system is short of refrigerant, or refrigerant flow is blocked. Lack of refrigerant or discharging fault. Outdoor LED flashes 16 times. |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| F14 | The valve that switches between heating and cooling failed to change over. 4-way valve switching failure. Outdoor LED flashes 17 times. |
🟡 Book a service call – this one needs a technician. |
| F11 | The compressor isn't running the way the controller expects. Loss of synchronism detection. Outdoor LED flashes 18 times. |
🟡 Book a service call – this one needs a technician. |
| F28 | The circuit that tracks the compressor's rotor position has a fault. Compressor position detection circuit fault. Outdoor LED flashes 19 times. |
🟡 Book a service call – this one needs a technician. |
| F15 | The electrical terminal block is getting too hot. Terminal block temperature too high – US-market models only. Outdoor LED flashes 20 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| E5 | The indoor coil started icing up and the unit shut down to protect itself. Indoor anti-frosting protection. Outdoor LED flashes 22 times. |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| F5 | The inverter power module overheated. Module thermal overload. Outdoor LED flashes 23 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F2 | The compressor failed to start, or drew too much current. Compressor start failure / high compressor current. Outdoor LED flashes 24 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F23 | The power module drew too much input current. Module input over-current. Outdoor LED flashes 25 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F9 | The power module reset itself – often after a power glitch. Power module reset. Outdoor LED flashes 26 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F24 | The circuit that measures compressor current has a fault. Current detect circuit malfunction – power module or compressor fault. Outdoor LED flashes 27 times. |
🟡 Book a service call – this one needs a technician. |
| F41 | Refrigerant pressure climbed too high and the system shut down to protect itself. System high-pressure protection – refrigerant overcharge, high condensing temperature or fan motor fault. Outdoor LED flashes 44 times. Some models don't have this fault. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F43 | The indoor and outdoor units aren't a matching pairing. Wrong match between indoor and outdoor unit. Outdoor LED flashes 46 times. Some models don't have this fault. |
🟡 Book a service call – this one needs a technician. |
| E1 | The indoor unit's room temperature sensor isn't reading properly. Room temperature sensor failure (no outdoor LED count). |
🟡 Book a service call – this one needs a technician. |
| E2 | The indoor coil's temperature sensor isn't reading properly. Indoor coil temperature sensor failure (no outdoor LED count). |
🟡 Book a service call – this one needs a technician. |
| E4 | The indoor unit's control board has a fault. Indoor PCB error (no outdoor LED count). |
🟡 Book a service call – this one needs a technician. |
| E14 | The indoor fan motor isn't running properly. Indoor fan motor malfunction (no outdoor LED count). |
🟡 Book a service call – this one needs a technician. |
Multi slim & mid ducted indoor units (AD09-24SS1ERA(N)(P), AD12/18MS1ERA, AD24MS2ERA)
Where the code shows: Wired controller shows the code; indoor PCB LED4 (yellow) flashes the tens digit and LED3 (green) the units digit. For outdoor faults the flash count equals the outdoor error code plus 20..
| Code | What it means | What to do |
|---|---|---|
| 01 | The indoor unit's room temperature sensor isn't reading properly. Indoor ambient temperature sensor malfunction – disconnected, broken, out of position or shorted. |
🟡 Book a service call – this one needs a technician. |
| 02 | The indoor pipe (coil) temperature sensor isn't reading properly. Indoor piping temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 04 | The indoor unit's control board has a memory fault. Indoor PCB EEPROM error. |
🟡 Book a service call – this one needs a technician. |
| 07 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication abnormal – wiring, addressing, power supply or PCB. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 08 | The wired controller has lost communication with the indoor unit. Wired controller to indoor unit communication abnormal (no wired-controller display for this one). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0C | The condensate drain system has a fault – pump or float switch. Drain system malfunction (LED flash count 12). |
🟡 Book a service call – the drain needs attention before it can run safely. |
| 0D | The unit can't read the incoming mains power waveform properly. Zero-cross signal detected wrong (LED flash count 13). |
🟡 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0E | The indoor fan motor isn't running properly. Indoor DC fan motor abnormal (LED flash count 14). |
🟡 Book a service call – this one needs a technician. |
Multi cassette indoor units (AB09/12/18CS2ERA)
Where the code shows: Wired controller shows the code; indoor PCB LED5 (red) flashes the tens digit and LED1 (yellow) the units digit. For outdoor faults the flash count equals the outdoor error code plus 20..
| Code | What it means | What to do |
|---|---|---|
| 01 | The indoor unit's room temperature sensor isn't reading properly. Indoor ambient temperature sensor malfunction – disconnected, broken, out of position or shorted. |
🟡 Book a service call – this one needs a technician. |
| 02 | The indoor pipe (coil) temperature sensor isn't reading properly. Indoor piping temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 04 | The indoor unit's control board has a memory fault. Indoor PCB EEPROM error. |
🟡 Book a service call – this one needs a technician. |
| 07 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication abnormal – wiring, addressing, power supply or PCB. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 08 | The wired controller has lost communication with the indoor unit. Wired controller to indoor unit communication abnormal (no wired-controller display for this one). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0C | The condensate drain system has a fault – pump or float switch. Drain system malfunction (LED flash count 12). |
🟡 Book a service call – the drain needs attention before it can run safely. |
| 0D | The unit can't read the incoming mains power waveform properly. Zero-cross signal detected wrong (LED flash count 13). |
🟡 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0E | The indoor fan motor isn't running properly. Indoor DC fan motor abnormal (LED flash count 14). |
🟡 Book a service call – this one needs a technician. |
Multi cassette indoor unit (AB24ES1ERA(S))
Where the code shows: Wired controller shows the code (hex); indoor PCB LED4 (yellow) tens digit, LED3 (green) units digit. Wired-controller codes 15-40 (hex) mean an outdoor fault: convert the hex value to decimal and subtract 20 to get the outdoor error code..
| Code | What it means | What to do |
|---|---|---|
| 01 | The indoor unit's room temperature sensor isn't reading properly. Indoor ambient temperature sensor malfunction – disconnected, broken, out of position or shorted. |
🟡 Book a service call – this one needs a technician. |
| 02 | The indoor pipe (coil) temperature sensor isn't reading properly. Indoor piping temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 04 | The indoor unit's control board has a memory fault. Indoor PCB EEPROM error. |
🟡 Book a service call – this one needs a technician. |
| 07 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication abnormal – wiring, addressing, power supply or PCB. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 08 | The wired controller has lost communication with the indoor unit. Wired controller to indoor unit communication abnormal (no wired-controller display for this one). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0C | The condensate drain system has a fault – pump or float switch. Drain system malfunction (LED flash count 12). |
🟡 Book a service call – the drain needs attention before it can run safely. |
| 0D | The unit can't read the incoming mains power waveform properly. Zero-cross signal detected wrong (LED flash count 13). |
🟡 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 10 | This indoor unit is set to a different mode from the rest of the system. Indoor abnormal mode operation – mode differs from the outdoor unit's mode (LED flash count 16). |
🟢 Set every indoor unit to the same mode (all cooling or all heating), then try again. If the code stays, book a service. |
Multi console indoor units
Where the code shows: E/F codes on the indoor display panel; outdoor faults also shown as LED1 flash counts on the outdoor PCB..
| Code | What it means | What to do |
|---|---|---|
| E7 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication fault. Indoor display shows E7; outdoor LED1 flashes 15 times. Haier's E7 guide has the technician check the interconnect cable, active/neutral wiring and the comms wire; if the unit runs about 4 minutes before faulting it points to the indoor PCB; with outdoor LED2 on the cause is the outdoor or indoor PCB, with LED2 off the outdoor PCB or power module. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| E1 | The indoor unit's room temperature sensor isn't reading properly. Room temperature sensor failure. |
🟡 Book a service call – this one needs a technician. |
| E2 | The indoor coil's temperature sensor isn't reading properly. Heat-exchange sensor failure. |
🟡 Book a service call – this one needs a technician. |
| E4 | The indoor unit's control board has a memory fault. Indoor EEPROM error. |
🟡 Book a service call – this one needs a technician. |
| E14 | The indoor fan motor isn't running properly. Indoor fan motor malfunction. |
🟡 Book a service call – this one needs a technician. |
| F12 | The outdoor unit's control board has a memory fault. Outdoor EEPROM error. Outdoor LED1 flashes 1 time. |
🟡 Book a service call – this one needs a technician. |
| F1 | The outdoor unit's inverter power module tripped to protect itself. IPM protection. Outdoor LED1 flashes 2 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F22 | The outdoor unit shut down because it drew too much electrical current. AC over-current protection. Outdoor LED1 flashes 3 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F3 | Two boards inside the outdoor unit (power module and main PCB) have lost communication. IPM to outdoor PCB communication fault. Outdoor LED1 flashes 4 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F19 | The incoming power supply voltage is too high or too low. Power voltage out of range. Outdoor LED1 flashes 6 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F27 | The compressor has locked up or keeps stopping. Compressor lock-rotor or momentary stopping. Outdoor LED1 flashes 7 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F4 | The compressor got too hot and the unit shut down to prevent damage. Discharge temperature overheat protection. Outdoor LED1 flashes 8 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F8 | The outdoor fan motor isn't running properly. Outdoor DC fan motor fault. Outdoor LED1 flashes 9 times. |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| F21 | The outdoor defrost temperature sensor isn't reading properly. Defrost temperature sensor failure. Outdoor LED1 flashes 10 times. |
🟡 Book a service call – this one needs a technician. |
| F7 | The suction temperature sensor isn't reading properly. Suction temperature sensor failure. Outdoor LED1 flashes 11 times. |
🟡 Book a service call – this one needs a technician. |
| F6 | The outdoor air temperature sensor isn't reading properly. Ambient temperature sensor failure. Outdoor LED1 flashes 12 times. |
🟡 Book a service call – this one needs a technician. |
| F25 | The compressor discharge temperature sensor isn't reading properly. Discharge temperature sensor failure. Outdoor LED1 flashes 13 times. |
🟡 Book a service call – this one needs a technician. |
| F13 | The system is short of refrigerant. Short of refrigerant. Outdoor LED1 flashes 16 times. |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| F11 | The compressor isn't running the way the controller expects. Compressor deviates from normal running. Outdoor LED1 flashes 18 times. |
🟡 Book a service call – this one needs a technician. |
| F28 | The circuit that tracks the compressor's rotor position has a fault. Rotor position detection loop error. Outdoor LED1 flashes 19 times. |
🟡 Book a service call – this one needs a technician. |
| (no indoor code) | An indoor unit overloaded and the system shut it down to protect it. Overload protection of indoor system – no indoor display code; outdoor LED1 flashes 21 times. |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| F2 | The compressor drew too much current and the unit shut down. Compressor over-current. Outdoor LED1 flashes 24 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F23 | The compressor drew too much current on one phase and the unit shut down. Single-phase compressor over-current protection. Outdoor LED1 flashes 25 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| E9 | The indoor unit is working too hard and shut down to protect itself. High work-intensity protection. Outdoor LED1 flashes 21 times (same count as the indoor overload row, as printed). |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
Multi hi-wall indoor units
Where the code shows: E/F codes on the indoor display panel; outdoor faults also shown as LED1 flash counts on the outdoor PCB..
| Code | What it means | What to do |
|---|---|---|
| E7 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication fault. Indoor display shows E7; outdoor LED1 flashes 15 times. Haier's E7 guide has the technician check the interconnect cable, active/neutral wiring and the comms wire; if the unit runs about 4 minutes before faulting it points to the indoor PCB; with outdoor LED2 on the cause is the outdoor or indoor PCB, with LED2 off the outdoor PCB or power module. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| E1 | The indoor unit's room temperature sensor isn't reading properly. Room temperature sensor failure. |
🟡 Book a service call – this one needs a technician. |
| E2 | The indoor coil's temperature sensor isn't reading properly. Heat-exchange sensor failure. |
🟡 Book a service call – this one needs a technician. |
| E4 | The indoor unit's control board has a memory fault. Indoor EEPROM error. |
🟡 Book a service call – this one needs a technician. |
| E14 | The indoor fan motor isn't running properly. Indoor fan motor malfunction. |
🟡 Book a service call – this one needs a technician. |
| F12 | The outdoor unit's control board has a memory fault. Outdoor EEPROM error. Outdoor LED1 flashes 1 time. |
🟡 Book a service call – this one needs a technician. |
| F1 | The outdoor unit's inverter power module tripped to protect itself. IPM protection. Outdoor LED1 flashes 2 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F22 | The outdoor unit shut down because it drew too much electrical current. AC over-current protection. Outdoor LED1 flashes 3 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F3 | Two boards inside the outdoor unit (power module and main PCB) have lost communication. IPM to outdoor PCB communication fault. Outdoor LED1 flashes 4 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F19 | The incoming power supply voltage is too high or too low. Power voltage out of range. Outdoor LED1 flashes 6 times. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| F27 | The compressor has locked up or keeps stopping. Compressor lock-rotor or momentary stopping. Outdoor LED1 flashes 7 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F4 | The compressor got too hot and the unit shut down to prevent damage. Discharge temperature overheat protection. Outdoor LED1 flashes 8 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F8 | The outdoor fan motor isn't running properly. Outdoor DC fan motor fault. Outdoor LED1 flashes 9 times. |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| F21 | The outdoor defrost temperature sensor isn't reading properly. Defrost temperature sensor failure. Outdoor LED1 flashes 10 times. |
🟡 Book a service call – this one needs a technician. |
| F7 | The suction temperature sensor isn't reading properly. Suction temperature sensor failure. Outdoor LED1 flashes 11 times. |
🟡 Book a service call – this one needs a technician. |
| F6 | The outdoor air temperature sensor isn't reading properly. Ambient temperature sensor failure. Outdoor LED1 flashes 12 times. |
🟡 Book a service call – this one needs a technician. |
| F25 | The compressor discharge temperature sensor isn't reading properly. Discharge temperature sensor failure. Outdoor LED1 flashes 13 times. |
🟡 Book a service call – this one needs a technician. |
| F13 | The system is short of refrigerant. Short of refrigerant. Outdoor LED1 flashes 16 times. |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| F11 | The compressor isn't running the way the controller expects. Compressor deviates from normal running. Outdoor LED1 flashes 18 times. |
🟡 Book a service call – this one needs a technician. |
| F28 | The circuit that tracks the compressor's rotor position has a fault. Rotor position detection loop error. Outdoor LED1 flashes 19 times. |
🟡 Book a service call – this one needs a technician. |
| (no indoor code) | An indoor unit overloaded and the system shut it down to protect it. Overload protection of indoor system – no indoor display code; outdoor LED1 flashes 21 times. |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| F2 | The compressor drew too much current and the unit shut down. Compressor over-current. Outdoor LED1 flashes 24 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| F23 | The compressor drew too much current on one phase and the unit shut down. Single-phase compressor over-current protection. Outdoor LED1 flashes 25 times. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| E9 | The indoor unit is working too hard and shut down to protect itself. High work-intensity protection. Outdoor LED1 flashes 21 times (same count as the indoor overload row, as printed). |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
Multi outdoor units (3U19FSERA, 3U24GS2ERA, 4U30HS2ERA, 5U34HS2ERA)
Where the code shows: Numeral light indicator (digital display) on the outdoor unit..
| Code | What it means | What to do |
|---|---|---|
| 1 | The outdoor unit's control board has a memory fault. Outdoor EEPROM faulty. |
🟡 Book a service call – this one needs a technician. |
| 2 | The inverter power module tripped on over-current or a short circuit. IPM over-current or short circuit. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 4 | Two boards inside the outdoor unit (module and ECU) have lost communication. Module-ECU communication failure. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 5 | The inverter power module overloaded and shut down. Module operated overload. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 6 | The voltage inside the power module is too low or too high. Module low or high voltage – often follows a power glitch. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 8 | The compressor got too hot and the system shut down to prevent damage. Discharge temperature overheating – lack of refrigerant, very high ambient temperature or blocked PMVs (electronic valves). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 9 | The outdoor DC fan motor isn't running properly. DC fan motor malfunction. |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| 10 | The defrost temperature sensor isn't reading properly. Defrosting temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 11 | The compressor suction temperature sensor isn't reading properly. Compressor suction temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 12 | The outdoor air temperature sensor isn't reading properly. Ambient temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 13 | The compressor discharge temperature sensor isn't reading properly. Compressor discharge temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 15 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication failure. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 16 | The system is short of refrigerant, or refrigerant flow is restricted. Lack of refrigerant or discharging fault. |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| 17 | The valve that switches between heating and cooling failed to change over. 4-way valve switching failure. |
🟡 Book a service call – this one needs a technician. |
| 18 | The compressor isn't running the way the controller expects. Loss of synchronism detection. |
🟡 Book a service call – this one needs a technician. |
| 20 | An indoor unit overheated and shut down to protect itself. Indoor thermal overload. |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| 21 | An indoor coil started icing up and the system shut down to protect it. Indoor frosted (anti-freeze protection). |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| 23 | The inverter power module overheated. Module thermal overload. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 24 | The compressor is failing to start. Compressor start failure. |
🟡 Book a service call – this one needs a technician. |
| 25 | The power module drew too much input current. Module input over-current. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 26 | The outdoor unit's microcontroller reset itself – often after a power glitch. MCU reset. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 27 | The circuit that measures module current has a fault. Module current detect circuit malfunction. |
🟡 Book a service call – this one needs a technician. |
| 28 | The liquid-pipe temperature sensor for indoor unit A isn't reading properly. Liquid pipe temperature sensor, indoor unit A. |
🟡 Book a service call – this one needs a technician. |
| 29 | The liquid-pipe temperature sensor for indoor unit B isn't reading properly. Liquid pipe temperature sensor, indoor unit B. |
🟡 Book a service call – this one needs a technician. |
| 30 | The liquid-pipe temperature sensor for indoor unit C isn't reading properly. Liquid pipe temperature sensor, indoor unit C. |
🟡 Book a service call – this one needs a technician. |
| 31 | The liquid-pipe temperature sensor for indoor unit D isn't reading properly. Liquid pipe temperature sensor, indoor unit D. |
🟡 Book a service call – this one needs a technician. |
| 32 | The gas-pipe temperature sensor for indoor unit A isn't reading properly. Gas pipe temperature sensor, indoor unit A. |
🟡 Book a service call – this one needs a technician. |
| 33 | The gas-pipe temperature sensor for indoor unit B isn't reading properly. Gas pipe temperature sensor, indoor unit B. |
🟡 Book a service call – this one needs a technician. |
| 34 | The gas-pipe temperature sensor for indoor unit C isn't reading properly. Gas pipe temperature sensor, indoor unit C. |
🟡 Book a service call – this one needs a technician. |
| 35 | The gas-pipe temperature sensor for indoor unit D isn't reading properly. Gas pipe temperature sensor, indoor unit D. |
🟡 Book a service call – this one needs a technician. |
| 36 | The gas-pipe temperature sensor for indoor unit E isn't reading properly. Gas pipe temperature sensor, indoor unit E. |
🟡 Book a service call – this one needs a technician. |
| 38 | A temperature sensor on the power module is faulty, or a brief power failure was detected. Module temperature sensor malfunction / momentary power failure detection. |
🟡 Book a service call – this one needs a technician. |
| 39 | The condensing (coil) temperature sensor isn't reading properly. Condensing temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 40 | The liquid-pipe temperature sensor for indoor unit E isn't reading properly. Liquid pipe temperature sensor, indoor unit E. |
🟡 Book a service call – this one needs a technician. |
| 42 | The system's high-pressure safety switch cut the unit out. System high pressure switch off. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 43 | The system's low-pressure safety switch cut the unit out. System low pressure switch off. |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| 44 | Refrigerant pressure climbed too high and the system shut down to protect itself. System high pressure protection – refrigerant overcharge, high condensing temperature or fan motor fault. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 45 | Refrigerant pressure dropped too low and the system shut down to protect itself. System low pressure protection – refrigerant shortage, low defrosting temperature or fan motor fault. |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
Cassette indoor units (ABH071/90/105H1ERG, ABH125/140K1ERG)
Where the code shows: IR receiver digital display on the cassette panel; indoor PCB LED4 (red) tens digit, LED1 (yellow) units digit. Outdoor faults display as the hex value of (outdoor code + 20)..
| Code | What it means | What to do |
|---|---|---|
| 01 | The indoor unit's room temperature sensor isn't reading properly. Indoor ambient temperature sensor malfunction – disconnected, broken, out of position or shorted. |
🟡 Book a service call – this one needs a technician. |
| 02 | The indoor pipe (coil) temperature sensor isn't reading properly. Indoor piping temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 04 | The indoor unit's control board has a memory fault. Indoor PCB EEPROM error. |
🟡 Book a service call – this one needs a technician. |
| 07 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication abnormal – wiring, addressing, power supply or PCB. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 08 | The wired controller has lost communication with the indoor unit. Wired controller to indoor unit communication abnormal. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0C | The condensate drain system has a fault – pump or float switch. Drain system malfunction (LED flash count 12). |
🟡 Book a service call – the drain needs attention before it can run safely. |
| 0D | The unit can't read the incoming mains power waveform properly. Zero-cross signal detected wrong (LED flash count 13). |
🟡 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0E | The indoor fan motor isn't running properly. Indoor DC fan motor abnormal (LED flash count 14). |
🟡 Book a service call – this one needs a technician. |
Smart power cassette – receiver display codes for outdoor faults
Where the code shows: Cassette panel IR receiver digital display (code keeps flashing). Display value is the hex of (outdoor error code + 20); both values listed per row..
| Code | What it means | What to do |
|---|---|---|
| 15 | The outdoor unit's control board has a memory fault. Outdoor unit error code 1. Outdoor main control PCB EEPROM malfunction. |
🟡 Book a service call – this one needs a technician. |
| 16 | The inverter power module tripped on over-current. Outdoor unit error code 2. PIM (power intelligent module) hardware over-current. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 17 | The compressor drew too much current while slowing down. Outdoor unit error code 3. Compressor over-current during deceleration. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 18 | Two boards inside the outdoor unit (control board and compressor driver) have lost communication. Outdoor unit error code 4. Control board to compressor driver module communication abnormal. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 19 | The compressor drew too much current. Outdoor unit error code 5. Compressor over-current detected by the control board. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 1A | The voltage supplied to the unit is too high. Outdoor unit error code 6. DC or AC voltage high. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 1B | The circuit that measures compressor current has a fault. Outdoor unit error code 7. Compressor current sampling circuit fault. |
🟡 Book a service call – this one needs a technician. |
| 1C | The compressor got too hot and the unit shut down to prevent damage. Outdoor unit error code 8. Discharge temperature too high protection. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 1D | The outdoor DC fan motor isn't running properly. Outdoor unit error code 9. DC fan motor fault. |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| 1E | The outdoor defrost temperature sensor isn't reading properly. Outdoor unit error code 10. Defrosting temperature sensor Te abnormal. |
🟡 Book a service call – this one needs a technician. |
| 1F | The suction temperature sensor isn't reading properly. Outdoor unit error code 11. Suction temperature sensor Ts abnormal. |
🟡 Book a service call – this one needs a technician. |
| 20 | The outdoor air temperature sensor isn't reading properly. Outdoor unit error code 12. Outdoor ambient temperature sensor Ta abnormal. |
🟡 Book a service call – this one needs a technician. |
| 21 | The compressor discharge temperature sensor isn't reading properly. Outdoor unit error code 13. Discharging temperature sensor Td abnormal. |
🟡 Book a service call – this one needs a technician. |
| 22 | The power-correction circuit in the outdoor unit saw too high a voltage. Outdoor unit error code 14. PFC circuit loop high voltage. |
🟡 Book a service call – this one needs a technician. |
| 23 | The indoor and outdoor units have stopped talking to each other. Outdoor unit error code 15. Indoor-outdoor communication abnormal. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 24 | The system is short of refrigerant, or the discharge pipe is blocked. Outdoor unit error code 16. Lack of refrigerant or discharging pipe blocked. |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| 25 | The valve that switches between heating and cooling isn't working properly. Outdoor unit error code 17. 4-way valve converse abnormal. |
🟡 Book a service call – this one needs a technician. |
| 26 | The compressor isn't running the way the controller expects. Outdoor unit error code 18. Compressor motor desynchronising. |
🟡 Book a service call – this one needs a technician. |
| 28 | The indoor coil got too hot and the unit shut down to protect itself. Outdoor unit error code 20. Indoor pipe temperature too high protection. |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| 2A | The power-correction circuit in the outdoor unit drew too much current. Outdoor unit error code 22. PFC circuit loop over-current. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 2B | The compressor driver electronics overheated. Outdoor unit error code 23. Temperature too high for compressor driver module. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 2C | The compressor is failing to start. Outdoor unit error code 24. Compressor start failure. |
🟡 Book a service call – this one needs a technician. |
| 2D | The compressor drive module drew too much input current. Outdoor unit error code 25. Input over-current of the drive module. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 2E | The drive module's power supply is missing a phase (three-phase models). Outdoor unit error code 26. Lack phase of the drive module power supply. |
🟡 Book a service call – this one needs a technician. |
| 2F | The circuit that measures input current has a fault. Outdoor unit error code 27. Input current sampling circuit fault. |
🟡 Book a service call – this one needs a technician. |
| 30 | The compressor isn't wired to its drive module. Outdoor unit error code 28. No wiring between compressor and driver module. |
🟡 Book a service call – this one needs a technician. |
| 39 | The compressor drew too much current. Outdoor unit error code 37. Compressor over-current detected by the compressor driver module. |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 3A | The temperature sensor on the drive module isn't reading properly. Outdoor unit error code 38. Drive module ambient temperature sensor abnormal. |
🟡 Book a service call – this one needs a technician. |
| 3B | The mid-coil temperature sensor isn't reading properly. Outdoor unit error code 39. Mid-condenser temperature sensor TC abnormal. |
🟡 Book a service call – this one needs a technician. |
| 3E | The system's high-pressure safety switch has an open circuit. Outdoor unit error code 42. High pressure switch abnormal (open circuit). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 3F | The system's low-pressure safety switch has an open circuit. Outdoor unit error code 43. Low pressure switch abnormal (open circuit). |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| 40 | The outdoor coil got too hot and the unit shut down to protect itself. Outdoor unit error code 44. Outdoor condenser temperature TC too high protection. |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| 41 | Refrigerant pressure dropped too low and the system shut down to protect itself. Outdoor unit error code 45. System low pressure protection. |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
Low static ducted indoor units (ADH071/090/105/125/140M1ERG)
Where the code shows: Wired controller shows the code; indoor PCB LED4 (yellow) tens digit, LED3 (green) units digit. For outdoor faults: outdoor error code = (LED4 x 10 + LED3) – 20..
| Code | What it means | What to do |
|---|---|---|
| 01 | The indoor unit's room temperature sensor isn't reading properly. Indoor ambient temperature sensor malfunction (LED3 flashes 1). |
🟡 Book a service call – this one needs a technician. |
| 02 | The indoor pipe (coil) temperature sensor isn't reading properly. Indoor piping temperature sensor malfunction (LED3 flashes 2). |
🟡 Book a service call – this one needs a technician. |
| 04 | The indoor unit's control board has a memory fault. Indoor PCB EEPROM error (LED3 flashes 4). |
🟡 Book a service call – this one needs a technician. |
| 07 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication abnormal (LED3 flashes 7). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 08 | The wired controller has lost communication with the indoor unit. Wired controller to indoor unit communication abnormal (LED3 flashes 8). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0C | The condensate drain system has a fault – pump or float switch. Drain system malfunction (LED3 flashes 12). |
🟡 Book a service call – the drain needs attention before it can run safely. |
| 0D | The unit can't read the incoming mains power waveform properly. Zero-cross signal detected wrong (LED3 flashes 13). |
🟡 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0E | Two boards inside the indoor unit (main PCB and fan motor drive) have lost communication. Main control PCB to fan motor drive communication abnormal (LED3 flashes 14). NOTE: on high-static ducted models 0E means the indoor DC fan motor instead. |
🟡 Book a service call – this one needs a technician. |
| 0F | The indoor fan motor is drawing too much current. Fan motor over-current (LED3 flashes 15). |
🟡 Book a service call – this one needs a technician. |
| 11 | The voltage feeding the indoor fan motor driver is too high or too low. Fan motor driver DC voltage high or low (LED3 flashes 17). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 12 | The indoor fan motor driver overheated. Fan motor driver over 95 degrees C (LED3 flashes 18). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 13 | The indoor fan motor has lost step with its driver. Fan motor out of step – wrong rotor location detected (LED3 flashes 19). |
🟡 Book a service call – this one needs a technician. |
High static ducted indoor units (ADH105/125/140H1ERG)
Where the code shows: Wired controller / receiver digital display. Outdoor faults display as the hex value of (outdoor code + 20)..
| Code | What it means | What to do |
|---|---|---|
| 01 | The indoor unit's room temperature sensor isn't reading properly. Indoor ambient temperature sensor malfunction – disconnected, broken, out of position or shorted. |
🟡 Book a service call – this one needs a technician. |
| 02 | The indoor pipe (coil) temperature sensor isn't reading properly. Indoor piping temperature sensor malfunction. |
🟡 Book a service call – this one needs a technician. |
| 04 | The indoor unit's control board has a memory fault. Indoor PCB EEPROM error. |
🟡 Book a service call – this one needs a technician. |
| 07 | The indoor and outdoor units have stopped talking to each other. Indoor-outdoor communication abnormal – wiring, addressing, power supply or PCB. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 08 | The wired controller has lost communication with the indoor unit. Wired controller to indoor unit communication abnormal (no wired-controller display for this one). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0C | The condensate drain system has a fault – pump or float switch. Drain system malfunction (LED flash count 12). |
🟡 Book a service call – the drain needs attention before it can run safely. |
| 0D | The unit can't read the incoming mains power waveform properly. Zero-cross signal detected wrong (LED flash count 13). |
🟡 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 0E | The indoor fan motor isn't running properly. Indoor DC fan motor abnormal (LED flash count 14). |
🟡 Book a service call – this one needs a technician. |
Ducted outdoor units (1UH090/105/125/140 N/P 1ERG(K))
Where the code shows: LED3 digital display on the outdoor control board shows the error code and keeps flashing. 'Non-resumable' faults only clear after fixing the cause and cycling power..
| Code | What it means | What to do |
|---|---|---|
| 1 | The outdoor unit's control board has a memory fault. EEPROM chip damaged or data wrong. (non-resumable) |
🟡 Book a service call – this one needs a technician. |
| 2 | The inverter power module tripped on over-current. PIM hardware over-current detected. (resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 3 | The compressor drew too much current while slowing down. Compressor over-current during deceleration. (non-resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 4 | Two boards inside the outdoor unit (control board and compressor driver) have lost communication. Control board unable to communicate with the compressor driver module for over 4 minutes. (resumable) |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 5 | The compressor drew too much current. Compressor over-current detected by the control board. (non-resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 6 | The voltage supplied to the unit is too high. AC supply over 280 V or DC bus over 390 V. (resumable) |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 7 | The circuit that measures compressor current has a fault. Compressor current sampling circuit damaged. (non-resumable) |
🟡 Book a service call – this one needs a technician. |
| 8 | The compressor got too hot and the unit shut down to prevent damage. Discharge temperature over 115 degrees C; locks out after 3 trips in an hour. (non-resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 9 | The outdoor DC fan motor isn't running properly. DC fan motor damaged, disconnected or circuit broken; locks after 3 trips in 30 minutes. (non-resumable) |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| 10 | The outdoor defrost temperature sensor isn't reading properly. Defrost sensor Te out of range, short or open circuit. (resumable) |
🟡 Book a service call – this one needs a technician. |
| 11 | The suction temperature sensor isn't reading properly. Suction sensor Ts out of range, short or open circuit. (resumable) |
🟡 Book a service call – this one needs a technician. |
| 12 | The outdoor air temperature sensor isn't reading properly. Ambient sensor Ta out of range, short or open circuit. (resumable) |
🟡 Book a service call – this one needs a technician. |
| 13 | The compressor discharge temperature sensor isn't reading properly. Discharge sensor Td out of range, short or open circuit. (resumable) |
🟡 Book a service call – this one needs a technician. |
| 14 | The power-correction circuit in the outdoor unit saw too high a voltage. Over-voltage in the driver module's PFC circuit loop. (resumable) |
🟡 Book a service call – this one needs a technician. |
| 15 | The indoor and outdoor units have stopped talking to each other. Outdoor control board unable to communicate with the indoor control board for over 4 minutes. (resumable) |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 16 | The system is short of refrigerant, or the discharge pipe is blocked. Discharge/suction temperature difference over 80 degrees C after 10 minutes' running; locks after 3 trips in an hour. (non-resumable) |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| 17 | The valve that switches between heating and cooling isn't working properly. 4-way valve reversing abnormal; locks after 3 trips in an hour. (non-resumable) |
🟡 Book a service call – this one needs a technician. |
| 18 | The compressor isn't running the way the controller expects. Rotor desynchronising – overload, sharply fluctuating load, current sensor fault or missing inverter gate signal. (non-resumable) |
🟡 Book a service call – this one needs a technician. |
| 19 | The voltage supplied to the unit is too low. AC supply under 155 V or DC bus under 180 V. (resumable) |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 20 | The indoor coil got too hot and the unit shut down to protect itself. Indoor pipe temperature over 63 degrees C; clears when it falls below 52 degrees C. (resumable) |
🟡 Check the return-air filters are clean, then book a service if the code stays. |
| 22 | The power-correction circuit in the outdoor unit drew too much current. Over-current in the PFC circuit loop. (resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 23 | The compressor driver electronics overheated. Driver module PIM temperature over 90 degrees C; locks after 3 trips in an hour. (non-resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 24 | The compressor is failing to start. Compressor start failure detected by the driver module. (non-resumable) |
🟡 Book a service call – this one needs a technician. |
| 25 | The compressor drive module drew too much input current. Input current over 32 A (double-fan) or 27 A (single-fan); locks after 3 trips in an hour. (non-resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 26 | The drive module's power supply is missing a phase (three-phase models). Lack of phase in the drive module power supply. (non-resumable) |
🟡 Book a service call – this one needs a technician. |
| 27 | The circuit that measures input current has a fault. Driver module input current sampling circuit damaged. (resumable) |
🟡 Book a service call – this one needs a technician. |
| 28 | The compressor isn't wired to its drive module. No wiring between compressor and driver module. (non-resumable) |
🟡 Book a service call – this one needs a technician. |
| 37 | The compressor drew too much current. Compressor phase current over 27 A / 19.1 A during non-rated running, detected by the driver module. (resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 38 | The temperature sensor on the drive module isn't reading properly. Drive module ambient sensor outside -25 to 150 degrees C. (resumable) |
🟡 Book a service call – this one needs a technician. |
| 39 | The mid-coil temperature sensor isn't reading properly. Mid-condenser sensor TC outside -55 to 90 degrees C. (resumable) |
🟡 Book a service call – this one needs a technician. |
| 42 | The system's high-pressure safety switch tripped or is faulty. High pressure switch open circuit for 30 seconds after 3 minutes' running; locks after 3 trips in an hour. (non-resumable) |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 43 | The system's low-pressure safety switch tripped or is faulty. Low pressure switch disconnected 60 seconds running / 30 seconds standby. (non-resumable) |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
| 44 | The outdoor coil got too hot and the unit shut down to protect itself. Maximum of Tc/Te over 65 degrees C; locks after 3 trips in 30 minutes. (non-resumable) |
🟡 Check nothing is blocking the outdoor unit, then book a service if the fault stays. |
| 45 | System pressure dropped abnormally low and the unit shut down to protect itself. Indoor pipe Tm and outdoor Ts below -45 degrees C in cooling, or outdoor Tc and Te below -45 degrees C. (non-resumable) |
🔴 Turn the system off at the isolator and call us. Refrigerant work needs a licensed technician. |
Inverter (IPM) module board, single-phase (1UH071/090/105N1ERG)
Where the code shows: LED601 (green) on the module board inside the outdoor unit – technician access only. Normal running: 1s on / 1s off. Fault: flashes n times at 0.25s then 2s off, where n is the error code..
| Code | What it means | What to do |
|---|---|---|
| 1 | The inverter power module overheated. PIM module overheat – 105 degrees C sustained 5 seconds (symbol 01H). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 2 | The power module's temperature sensor circuit failed. PIM temperature sampling failure (symbol 18H). |
🟡 Book a service call – this one needs a technician. |
| 3 | The module tripped on over-current at its frequency limit. Over-current protection when at limit frequency (symbol 02H). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 4 | The power module's hardware protection tripped. Hardware protection PIM_INT (symbol 04H). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 6 | The DC voltage inside the module is too low. DC under-voltage (symbol 05H). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 7 | The DC voltage inside the module is too high. DC high voltage (symbol 06H). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 8 | The module has lost communication with the main board. Communication error (symbol 07H). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 9 | One of the module's output phases to the compressor is missing. Output lack of phase (symbol 16H). |
🟡 Book a service call – this one needs a technician. |
| 11 | The compressor's U phase drew too much current. U phase over-current, 40 A level (symbol 0AH). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 12 | The compressor has lost step with its driver. Compressor out of step (symbol 0EH). |
🟡 Book a service call – this one needs a technician. |
| 13 | The compressor's V phase drew too much current. V phase over-current, 40 A level (symbol 0CH). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 14 | The compressor's W phase drew too much current. W phase over-current, 40 A level (symbol 0DH). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 15 | The compressor failed to start. Compressor startup failure (symbol 0FH). |
🟡 Book a service call – this one needs a technician. |
| 16 | The circuit that measures compressor phase current failed. Phase current sampling failure (symbol 09H). |
🟡 Book a service call – this one needs a technician. |
| 19 | The incoming AC supply voltage is too low. AC input under-voltage, 155 V level (symbol 11H). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 20 | The incoming AC supply voltage is too high. AC input over-voltage, 280 V level (symbol 12H). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 21 | The unit drew too much current from the mains. AC input over-current, 35 A level (symbol 13H). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 22 | The circuit that measures input current failed. Input current sampling failure (symbol 08H). |
🟡 Book a service call – this one needs a technician. |
Inverter (IPM) module board, three-phase (1UH125/140P1ERK)
Where the code shows: LED601 (green) on the module board inside the outdoor unit – technician access only. Same flash scheme as the single-phase board..
| Code | What it means | What to do |
|---|---|---|
| 1 | The inverter power module overheated. PIM module overheat – 105 degrees C sustained 5 seconds (symbol 01H). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 2 | The power module's temperature sensor circuit failed. PIM temperature sampling failure (symbol 18H). |
🟡 Book a service call – this one needs a technician. |
| 3 | The module tripped on over-current at its frequency limit. Over-current protection when at limit frequency (symbol 02H). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 4 | The power module's hardware protection tripped. Hardware protection PIM_INT (symbol 04H). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 6 | The DC voltage inside the module is too low. DC under-voltage (symbol 05H). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 7 | The DC voltage inside the module is too high. DC high voltage (symbol 06H). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 8 | The module has lost communication with the main board. Communication error (symbol 07H). |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| 9 | One of the module's output phases to the compressor is missing. Output lack of phase (symbol 16H). |
🟡 Book a service call – this one needs a technician. |
| 11 | The compressor's U phase drew too much current. U phase over-current, 40 A level (symbol 0AH). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 12 | The compressor has lost step with its driver. Compressor out of step (symbol 0EH). |
🟡 Book a service call – this one needs a technician. |
| 13 | The compressor's V phase drew too much current. V phase over-current, 40 A level (symbol 0CH). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 14 | The compressor's W phase drew too much current. W phase over-current, 40 A level (symbol 0DH). |
🔴 Turn the system off at the isolator and call us – don't keep running it. |
| 15 | The compressor failed to start. Compressor startup failure (symbol 0FH). |
🟡 Book a service call – this one needs a technician. |
| 16 | The circuit that measures compressor phase current failed. Phase current sampling failure (symbol 09H). |
🟡 Book a service call – this one needs a technician. |
| 22 | The incoming three-phase supply is missing a phase. Input lack of phase – hardware protection (symbol 10H). 3-phase board DC levels: under-voltage 300 V, high voltage 700 V. |
🟡 Book a service call – this one needs a technician. |
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.