What does your ActronAir fault code mean?
Pick the code showing on your remote, wall controller or indoor unit and see what it means, what commonly causes it, and what is safe to check yourself. This page covers 207 ActronAir fault codes for units sold in Australia, compiled from official Australian manufacturer and distributor documentation, the same references our own technicians carry.
Heads up: ActronAir uses the same code with different meanings on different product ranges, so check the model range shown next to the code.
Every ActronAir fault code at a glance
Some models show faults as a flashing-light pattern instead of a code; documented lamp patterns are listed alongside their codes.
| Code | What it means | Severity |
|---|---|---|
| CP (Aurora (SWB) and Serene (WRC/WRE) wall splits and multi-split indoor units (MRE/BRE) (shown as off by remote switch on multi-splits)) | The remote on/off terminal is open, which usually means an external switch or energy management device has turned the unit off. | Normal operation |
| E0 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems and multi-split indoor units (MRE/BRE) (1 lamp flash)) also shown as 1 lamp flash |
The indoor unit’s memory chip (EEPROM) has a parameter error. | Fault – service needed |
| E0 (Multi-split outdoor units (MRC)) | The outdoor unit’s memory chip (EEPROM) has a parameter error. | Fault – service needed |
| E0 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | A power phase sequence error or phase failure has been detected (three phase units). | Fault – service needed |
| E01 (Classic 2 (CRA/CCA/EVA/EAA/EFA), Advance (CRV/EVV/EAA/EFV) and Aires (CRS/EVA) ducted systems (NEO, LR7-1 and LC7-2 wall controllers)) | The indoor fan is not running at the speed the system asked for (fan RPM feedback error). | Fault – service needed |
| E09 (Classic 2, ESP Platinum (shown as E9), Advance, Aires and QUE ducted systems) also shown as E9 |
The low pressure safety switch has tripped, usually because the system is low on refrigerant. | Fault – service needed |
| E1 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display), multi-split indoor units (MRE/BRE) (2 lamp flashes) and the WC-02 wired controller) also shown as 2 lamp flashes |
The indoor and outdoor units have lost communication with each other. | Fault – service needed |
| E10 (ESP Platinum, Advance, Aires and QUE ducted systems) | The low pressure sensor has failed (open or short circuit). | Minor fault |
| E100 (Advance ducted systems) | The drive’s PFC circuit has tripped a hardware overcurrent protection. | Fault – service needed |
| E100 (Aires ducted systems) | The compressor drive’s charging circuit has a malfunction. | Fault – service needed |
| E101 (Advance and Aires ducted systems) | The drive’s PFC circuit has tripped a software overcurrent protection. | Fault – service needed |
| E102 (Advance and Aires ducted systems) | The drive’s PFC circuit has detected excessive voltage. | Fault – service needed |
| E103 (Advance ducted systems with the R-32 (Uno Pro board) outdoor unit and Aires ducted systems) also shown as E103** |
The drive’s power module temperature reading is abnormally low or its sensor is open circuit. | Minor fault |
| E104 (Advance ducted systems with the R-32 (Uno Pro board) outdoor unit and Aires ducted systems) also shown as E104** |
The drive has locked itself out after reaching its fault limit and needs to be reset and checked. | Fault – service needed |
| E11 (Classic 2, ESP Platinum, Advance, Aires and QUE ducted systems) | The high pressure safety switch has tripped, usually because the outdoor unit cannot get rid of heat. | Fault – service needed |
| E12 (ESP Platinum, Advance, Aires and QUE ducted systems) | The high pressure sensor has failed (open or short circuit). | Minor fault |
| E13 (Advance ducted systems with the R-410A (Uno board) outdoor unit; QUE three phase systems can show the same meaning under E13) also shown as E13* |
The outdoor drive’s HSP connector jumper pin is missing or disconnected. | Fault – service needed |
| E13 (Advance, Aires and QUE three phase ducted systems) | The outdoor unit’s compressor drive has reported an internal error. | Fault – service needed |
| E14 (ESP Platinum and QUE single phase ducted systems) | The condenser pressure is too low for normal operation. | Fault – service needed |
| E15 (ESP Platinum, Advance, Aires and QUE ducted systems) | The outdoor unit has lost communication with its compressor speed drive (VSD). | Fault – service needed |
| E17 (ESP Platinum and QUE single phase ducted systems) | A fault has been detected in one of the outdoor unit’s peripheral devices. | Fault – service needed |
| E18 (ESP Platinum, Advance, Aires and QUE ducted systems (E18 open circuit, E19 short circuit on ESP Platinum and QUE single phase)) also shown as E19 |
The suction temperature sensor has failed or is giving an abnormal reading. | Minor fault |
| E2 (Multi-split outdoor units (MRC)) | The indoor and outdoor units have lost communication with each other. | Fault – service needed |
| E2 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The room temperature sensor (T1) has failed. | Minor fault |
| E2 (ESP Digital and ESP Plus ducted systems (SRD/SRV) with LM7 or LM24 wall controller) | The indoor coil outlet temperature sensor has failed (open or short circuit). | Minor fault |
| E22 (ESP Platinum, Advance, Aires and QUE ducted systems) | The outdoor ambient temperature sensor has failed, and the unit may run in a reduced safe mode. | Minor fault |
| E23 (ESP Platinum and QUE single phase ducted systems) | The outdoor unit has lost communication with its electronic expansion valve (EEV) board, and the unit runs in safe mode. | Fault – service needed |
| E25 (ESP Platinum and QUE single phase ducted systems) | The outdoor temperature reading has not updated, which is a status message rather than a breakdown. | Normal operation |
| E26 (ESP Platinum, Advance, Aires and QUE ducted systems) | The compressor drive has detected excessive electrical current and shut down to protect itself. | Fault – service needed |
| E27 (ESP Platinum, Advance, Aires and QUE ducted systems) | The compressor drive has detected the incoming voltage is too high. | Fault – service needed |
| E28 (ESP Platinum, Advance, Aires and QUE ducted systems) | The compressor drive electronics are running too hot. | Fault – service needed |
| E29 (ESP Platinum, Advance, Aires and QUE ducted systems) | The compressor drive has detected the incoming voltage is too low. | Fault – service needed |
| E3 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems and multi-split indoor units (MRE/BRE) (4 lamp flashes)) also shown as 4 lamp flashes |
The indoor fan is not running at the correct speed. | Fault – service needed |
| E3 (Multi-split outdoor units (MRC)) | The outdoor unit’s inverter (IPM) board has lost communication with the main outdoor control board. | Fault – service needed |
| E3 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The indoor coil outlet temperature sensor (T2A) has failed. | Minor fault |
| E3 (Ducted systems on LM7, LM24, LM-ZC, LR7, LC7, NEO and Que controllers (Classic, Classic 2, ESP Digital/Plus, ESP Platinum, Advance, Aires, QUE)) also shown as E03 |
A room temperature sensor has failed (open or short circuit), so the system cannot read the room temperature properly. | Minor fault |
| E30 (ESP Platinum, Advance, Aires and QUE ducted systems) | The compressor drive has locked itself out after repeated faults and needs to be reset and checked. | Fault – service needed |
| E31 (ESP Platinum and QUE single phase ducted systems) | The compressor drive has reported an internal error. | Fault – service needed |
| E32 (ESP Platinum and QUE single phase ducted systems) also shown as E33 |
The system tripped on high or low refrigerant pressure measured by the drive’s pressure sensors (envelope protection). | Fault – service needed |
| E34 (ESP Platinum and QUE single phase ducted systems) | The unit has reduced its output because the compressor drive is running hot (derating). | Minor fault |
| E35 (ESP Platinum and QUE single phase ducted systems) | The unit has reduced its output because the suction pressure is low (derating). | Minor fault |
| E36 (ESP Platinum and QUE single phase ducted systems) | The unit has reduced its output because the condenser pressure is low (derating). | Minor fault |
| E37 (ESP Platinum and QUE single phase ducted systems) | The unit has reduced its output because the condenser pressure is high (derating). | Minor fault |
| E38 (ESP Platinum and QUE single phase ducted systems) | The unit has reduced its output to stay within its power limit (derating). | Normal operation |
| E39 (ESP Platinum and QUE single phase ducted systems) | A defrost cycle took too long to complete and timed out. | Minor fault |
| E4 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems and multi-split indoor units (MRE/BRE) (5 lamp flashes)) also shown as 5 lamp flashes |
The indoor room temperature sensor (T1) has failed (open or short circuit). | Minor fault |
| E4 (Multi-split outdoor units (MRC)) | An outdoor temperature sensor (coil T3, ambient T4, discharge T5 or indoor coil outlet pipe T2B) has failed. | Minor fault |
| E4 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The indoor coil outlet pipe temperature sensor (T2B) has failed. | Minor fault |
| E4 (Ducted systems on LM7, LM24, LR7, LC7, NEO and Que controllers (Classic, Classic 2, ESP Digital/Plus, ESP Platinum, Advance, Aires, QUE; the QUE three phase table reads it as the indoor coil out sensor)) also shown as E04 |
The indoor coil temperature sensor has failed (open or short circuit). | Minor fault |
| E40 (ESP Platinum and QUE single phase ducted systems) | The compressor drive is restarting too frequently, which points to an underlying problem. | Fault – service needed |
| E41 (ESP Platinum, Advance, Aires and QUE ducted systems) | The compressor drive’s internal DC voltage is too low. | Fault – service needed |
| E42 (Advance, Aires and QUE three phase ducted systems) | The system shut down to protect the compressor because the evaporating pressure fell extremely low (envelope protection). | Fault – service needed |
| E43 (Advance, Aires and QUE three phase ducted systems) | The system shut down to protect the compressor because the compression ratio was too high (envelope protection). | Fault – service needed |
| E44 (Advance, Aires and QUE three phase ducted systems) | The system shut down because the condensing pressure was too high (envelope protection). | Fault – service needed |
| E45 (Advance, Aires and QUE three phase ducted systems) | The system shut down because the compression ratio was too low (envelope protection). | Fault – service needed |
| E47 (Advance, Aires and QUE three phase ducted systems) | The compressor hit its torque limit and the system shut down to protect it. | Fault – service needed |
| E5 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems and multi-split indoor units (MRE/BRE) (6 lamp flashes)) also shown as 6 lamp flashes |
The indoor coil temperature sensor (T2) has failed (open or short circuit). | Minor fault |
| E5 (Multi-split outdoor units (MRC)) | The supply voltage to the outdoor unit is too high or too low. | Fault – service needed |
| E5 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | An outdoor temperature sensor (T3 coil or TP discharge) has failed. | Minor fault |
| E5 (Classic (SRA/SRE/SRG), ESP Digital/Plus (SRD/SRV) and ESP Platinum ducted systems; QUE single phase shows E05 on the outdoor display) also shown as E05 |
The indoor and outdoor units have lost communication with each other. | Fault – service needed |
| E50 (Advance, Aires and QUE three phase ducted systems) | The outdoor control board is not configured correctly for the unit. | Fault – service needed |
| E51 (Classic 2, Advance, Aires and QUE ducted systems (NEO, LR7-1, LC7-2 or Que controllers)) | The indoor and outdoor units have lost communication with each other. | Fault – service needed |
| E52 (Classic 2, Advance, Aires and QUE ducted systems (NEO, LR7-1, LC7-2 or Que controllers)) | The indoor unit has lost communication with the wall controller. | Fault – service needed |
| E53 (QUE ducted systems with Que zoning (single and three phase)) | The indoor unit has lost communication with the zone (VAV) module. | Fault – service needed |
| E55 (Classic 2, Advance and Aires ducted systems (NEO, LR7-1 or LC7-2 wall controller)) | The outdoor unit has lost communication with the building management system (BMS) interface. | Minor fault |
| E56 (Classic 2, Advance and Aires ducted systems (NEO, LR7-1 or LC7-2 wall controller)) | The system cannot find a master wall controller. | Fault – service needed |
| E6 (Multi-split outdoor units (MRC)) | The power factor correction (PFC) module in the outdoor unit has tripped a protection. | Fault – service needed |
| E6 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The indoor circuit board’s zero crossing check has failed (a power signal fault on the board). | Fault – service needed |
| E6 (Most ActronAir ducted systems (Classic, ESP Digital/Plus, ESP Platinum, Advance, Aires, QUE; LM7, LM24, LR7, NEO and Que controllers)) also shown as E06 |
The compressor discharge temperature is too high, which often means the system is low on refrigerant. | Fault – service needed |
| E60 (Advance, Aires and QUE three phase ducted systems) | The compressor drive has detected excessive current in a compressor phase and shut down. | Urgent – turn it off |
| E61 (Advance and Aires ducted systems) | The compressor drive has lost one of the compressor’s output phases. | Fault – service needed |
| E62 (Advance, Aires and QUE three phase ducted systems) | The compressor drive’s internal DC bus voltage is too high. | Fault – service needed |
| E63 (Advance, Aires and QUE three phase ducted systems) | The compressor drive’s internal DC bus voltage is too low. | Fault – service needed |
| E64 (Advance ducted systems) | The compressor drive has lost track of the compressor rotor and stopped it. | Fault – service needed |
| E65 (Advance ducted systems) | The current sensor for the compressor’s U phase has failed. | Fault – service needed |
| E65 (Aires ducted systems) | The compressor drive has detected a compressor phase loss fault. | Fault – service needed |
| E66 (Advance ducted systems with the R-410A (Uno board) outdoor unit and QUE three phase systems) also shown as E66* |
The incoming AC supply voltage is imbalanced between phases or an input phase has been lost. | Fault – service needed |
| E67 (Advance ducted systems with the R-410A (Uno board) outdoor unit and QUE three phase systems) also shown as E67* |
The compressor drive’s inverter has tripped a de-saturation (hardware overcurrent) protection. | Fault – service needed |
| E68 (Advance ducted systems) | The current sensor for the compressor’s V phase has failed. | Fault – service needed |
| E69 (Advance, Aires and QUE three phase ducted systems) | The drive’s power factor correction (PFC-IGBT) module is running too hot. | Fault – service needed |
| E7 (Serene (WRC/WRE) wall splits and multi-split indoor units (MRE/BRE)) | The indoor unit’s display board has lost communication with the main indoor circuit board. | Minor fault |
| E7 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The indoor unit’s memory chip (EEPROM) has a fault. | Fault – service needed |
| E7 (Most ActronAir ducted systems (Classic, Classic 2, ESP Digital/Plus, ESP Platinum, Advance, Aires, QUE; LM7, LM24, LR7, NEO and Que controllers)) also shown as E07 |
The outdoor coil temperature sensor has failed (open or short circuit). | Minor fault |
| E70 (Advance, Aires and QUE three phase ducted systems) | The compressor drive has lost the compressor rotor position and stopped it. | Fault – service needed |
| E71 (Advance, Aires and QUE three phase ducted systems) | The compressor motor temperature sensor (thermistor) has failed. | Minor fault |
| E72 (Advance, Aires and QUE three phase ducted systems) | The drive’s precharge relay is stuck open, so the drive cannot power up properly. | Fault – service needed |
| E73 (Advance and Aires ducted systems) | The current sensor for the compressor’s W phase has failed. | Fault – service needed |
| E74 (Advance and Aires ducted systems) | The drive has tripped on IGBT overcurrent, which can point to a choke wiring problem or failure. | Urgent – turn it off |
| E74 (QUE three phase ducted systems) | The compressor drive has detected excessive current in a compressor phase and shut down. | Urgent – turn it off |
| E75 (Advance, Aires and QUE three phase ducted systems) | The drive kept reducing compressor speed because of high phase current until it timed out (foldback timeout). | Fault – service needed |
| E76 (Advance, Aires and QUE three phase ducted systems) | The drive kept reducing output because its power module was too hot until it timed out (foldback timeout). | Fault – service needed |
| E77 (Advance, Aires and QUE three phase ducted systems) | The drive kept reducing output because of high AC input current until it timed out (foldback timeout). | Fault – service needed |
| E78 (Advance and Aires ducted systems) | The drive’s power factor correction (PFC-IGBT) module temperature is abnormally low. | Minor fault |
| E78 (QUE three phase ducted systems) | The drive’s automatic configuration communication has timed out. | Fault – service needed |
| E79 (Advance and Aires ducted systems) | The drive has tripped a hardware overcurrent (IPM) protection on the compressor. | Urgent – turn it off |
| E8 (Cascade (URC/CRE) and UltraSlim (URC/LRE) twin systems (indoor display, 9 lamp flashes)) also shown as 9 lamp flashes |
The master and slave indoor units of a twin system have lost communication with each other. | Fault – service needed |
| E8 (Multi-split outdoor units (MRC)) | The outdoor fan is not running at the correct speed. | Fault – service needed |
| E8 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The indoor fan controller is out of control (the fan is not responding correctly). | Fault – service needed |
| E8 (ESP Digital/Plus, ESP Platinum, Advance, Aires and QUE ducted systems (not the original Classic series)) also shown as E08 |
The outdoor discharge temperature sensor has failed (open or short circuit). | Minor fault |
| E80 (Advance, Aires and QUE three phase ducted systems) | The compressor motor temperature is too high. | Fault – service needed |
| E81 (Advance, Aires and QUE three phase ducted systems) | The compressor drive’s control board temperature is too high. | Fault – service needed |
| E82 (Advance, Aires and QUE three phase ducted systems) | The compressor drive’s power module temperature is too high. | Fault – service needed |
| E83 (Advance, Aires and QUE three phase ducted systems) | The drive’s power factor correction (PFC-IGBT) module temperature is too high. | Fault – service needed |
| E84 (Advance, Aires and QUE three phase ducted systems) | Communication has been lost between two processors (DSP and PFC) inside the compressor drive. | Fault – service needed |
| E85 (Advance, Aires and QUE three phase ducted systems) | Communication has been lost between the drive’s communications processor and its DSP. | Fault – service needed |
| E86 (Advance and QUE three phase ducted systems) | The current drawn by the compressor phases is imbalanced. | Fault – service needed |
| E87 (Advance and QUE three phase ducted systems) | The current in the drive’s three phase PFC circuit is imbalanced. | Fault – service needed |
| E88 (Advance ducted systems with the R-32 (Uno Pro board) outdoor unit, Aires and QUE three phase systems) also shown as E88** |
The compressor drive has a microelectronics or memory (EEPROM) fault. | Fault – service needed |
| E89 (Advance and QUE three phase ducted systems) | The compressor motor ran over its speed limit and the drive shut it down. | Fault – service needed |
| E9 (Cascade (URC/CRE) and UltraSlim (URC/LRE) twin systems (indoor display, 10 lamp flashes)) also shown as 10 lamp flashes |
Another indoor unit in the twin system has a fault. | Fault – service needed |
| E9 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The main indoor circuit board has lost communication with the display board. | Minor fault |
| E9 (Classic (SRA/SRE/SRG) and ESP Digital/Plus (SRD/SRV) ducted systems with LM7 or LM24 wall controller) | A refrigerant pressure switch has tripped on high or low pressure, or a power phase problem has been detected (phase faults on three phase units). | Fault – service needed |
| E90 (Advance, Aires and QUE three phase ducted systems) | The drive is configured for the wrong compressor model. | Fault – service needed |
| E91 (Advance, Aires and QUE three phase ducted systems) | The temperatures measured inside the inverter are imbalanced. | Fault – service needed |
| E92 (Advance, Aires and QUE three phase ducted systems) | The temperatures measured in the drive’s PFC circuit are imbalanced. | Fault – service needed |
| E93 (Advance and Aires ducted systems) | The compressor motor temperature reading is abnormally low. | Minor fault |
| E94 (Advance and Aires ducted systems) | The compressor drive’s board temperature reading is abnormally low. | Minor fault |
| E95 (Advance and Aires ducted systems) | The drive’s power module temperature reading is abnormally low or its sensor has failed (open or short circuit). | Minor fault |
| E96 (Advance ducted systems) | The drive’s power factor correction (PFC-IGBT) module temperature is abnormally low. | Minor fault |
| E96 (Aires ducted systems) | The temperature sensing circuit for the drive’s PFC module has a malfunction. | Minor fault |
| E97 (Advance ducted systems) | The drive’s communications analog to digital converter (ADC) has failed. | Fault – service needed |
| E97 (Aires ducted systems) | A processor chip (IC) inside the compressor drive has reset unexpectedly. | Fault – service needed |
| E98 (Advance and Aires ducted systems) | A current sensor or current sensing circuit in the compressor drive has failed. | Fault – service needed |
| E99 (Advance ducted systems) | The compressor drive has tripped on compressor overload. | Fault – service needed |
| E99 (Aires ducted systems) | The compressor drive has reported a malfunction outside the standard list. | Fault – service needed |
| E99 (QUE single phase ducted systems) | The system shut down on compressor envelope protection. | Fault – service needed |
| EA (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The compressor has tripped its overload protection (recorded after 4 trips). | Fault – service needed |
| EB (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The inverter power module (IPM) has a malfunction. | Fault – service needed |
| EC (Aurora (SWB) and Serene (WRC/WRE) wall splits and Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (7 lamp flashes)) also shown as 7 lamp flashes |
The system has detected a possible refrigerant leak. | Urgent – turn it off |
| EC (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The air clean function has a malfunction. | Minor fault |
| EC07 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 12 lamp flashes |
The outdoor fan is running outside its normal speed range (some models). | Fault – service needed |
| EC0D (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 14 lamp flashes |
The outdoor unit has reported a malfunction; the outdoor display carries the detailed code. | Fault – service needed |
| EC51 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 5 lamp flashes |
The outdoor unit’s memory chip (EEPROM) has a parameter error. | Fault – service needed |
| EC52 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 5 lamp flashes |
The outdoor coil temperature sensor (T3) has failed (open or short circuit). | Minor fault |
| EC53 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 5 lamp flashes |
The outdoor air temperature sensor (T4) has failed (open or short circuit). | Minor fault |
| EC54 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 5 lamp flashes |
The compressor discharge temperature sensor (TP) has failed (open or short circuit). | Minor fault |
| EC56 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes (free-match indoor units)) also shown as 5 lamp flashes |
The evaporator coil outlet temperature sensor (T2B) has failed (open or short circuit). | Minor fault |
| ED (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The outdoor unit has a protection fault; the outdoor display carries the detailed code. | Fault – service needed |
| EE (Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems and multi-split indoor units (MRE/BRE) (cassette and ducted units, 8 lamp flashes); shown as EE full water alarm on the WC-02 wired controller) also shown as 8 lamp flashes |
The condensate water level alarm has activated, meaning the drain system cannot get rid of water. | Fault – service needed |
| EF (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | A fault outside the standard list has been detected (other fault). | Minor fault |
| EH00 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as EH0A, 1 lamp flash |
The indoor unit’s memory chip (EEPROM) has a parameter error. | Fault – service needed |
| EH03 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 4 lamp flashes |
The indoor fan is running outside its normal speed range (some models). | Fault – service needed |
| EH0E (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes (cassette and ducted units)) also shown as 13 lamp flashes |
The condensate water level alarm has activated, meaning the drain system cannot get rid of water. | Fault – service needed |
| EH0b (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 9 lamp flashes |
The two processor chips on the indoor unit have lost communication with each other. | Minor fault |
| EH3A (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes (units with an external fan module)) also shown as 4 lamp flashes |
The external fan module’s DC bus voltage is too low. | Fault – service needed |
| EH3b (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes (units with an external fan module)) also shown as 4 lamp flashes |
The external fan module’s DC bus voltage is too high. | Fault – service needed |
| EH60 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 6 lamp flashes |
The indoor room temperature sensor (T1) has failed (open or short circuit). | Minor fault |
| EH61 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 6 lamp flashes |
The indoor coil temperature sensor (T2) has failed (open or short circuit). | Minor fault |
| EHbA (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes (units with an external fan module)) | The external fan module has lost communication with the indoor unit. | Minor fault |
| EL01 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 2 lamp flashes |
The indoor and outdoor units have lost communication with each other. | Fault – service needed |
| EL0C (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 8 lamp flashes |
The system has detected a possible refrigerant leak (some models). | Urgent – turn it off |
| F0 (Serene (WRC/WRE) wall splits and Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (some units, 1 lamp flash); also the outdoor display on Cascade, UltraSlim and UltraSlim R-32 systems) also shown as 1 lamp flash |
Overcurrent or overload protection has tripped. | Urgent – turn it off |
| F0 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The wired wall controller has lost communication with the indoor unit. | Fault – service needed |
| F1 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display) and multi-split indoor units (MRE/BRE) (2 lamp flashes)) also shown as 2 lamp flashes |
The outdoor air temperature sensor (T4) has failed (open or short circuit). | Minor fault |
| F1 (Multi-split outdoor units (MRC)) | The coil outlet temperature sensor for indoor unit A has failed. | Minor fault |
| F1 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The elevating fascia panel has not closed properly. | Minor fault |
| F2 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display) and multi-split indoor units (MRE/BRE) (3 lamp flashes)) also shown as 3 lamp flashes |
The outdoor coil temperature sensor (T3) has failed (open or short circuit). | Minor fault |
| F2 (Multi-split outdoor units (MRC)) | The coil outlet temperature sensor for indoor unit B has failed. | Minor fault |
| F3 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display) and multi-split indoor units (MRE/BRE) (4 lamp flashes)) also shown as 4 lamp flashes |
The compressor discharge temperature sensor (T5) has failed (open or short circuit). | Minor fault |
| F3 (Multi-split outdoor units (MRC)) | The coil outlet temperature sensor for indoor unit C has failed. | Minor fault |
| F4 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display) and multi-split indoor units (MRE/BRE) (5 lamp flashes)) also shown as 5 lamp flashes |
The outdoor unit’s memory chip (EEPROM) has a parameter error. | Fault – service needed |
| F4 (Multi-split outdoor units (MRC)) | The coil outlet temperature sensor for indoor unit D has failed. | Minor fault |
| F5 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display) and multi-split indoor units (MRE/BRE) (6 lamp flashes)) also shown as 6 lamp flashes |
The outdoor fan is not running at the correct speed. | Fault – service needed |
| F5 (Multi-split outdoor units (MRC)) | The coil outlet temperature sensor for indoor unit E has failed. | Minor fault |
| F6 (Cascade and UltraSlim free-match indoor units and multi-split indoor units (MRE/BRE) (7 lamp flashes)) also shown as 7 lamp flashes |
The indoor coil outlet pipe temperature sensor (T2B) has failed (open or short circuit). | Minor fault |
| F7 (Cascade slim cassettes with an auto-lifting panel (8 lamp flashes)) also shown as 8 lamp flashes |
The auto-lifting panel has lost communication with the slim cassette unit. | Minor fault |
| F8 (Cascade slim cassettes with an auto-lifting panel (9 lamp flashes)) also shown as 9 lamp flashes |
The auto-lifting panel mechanism is faulty. | Minor fault |
| F9 (Cascade slim cassettes with an auto-lifting panel (10 lamp flashes)) also shown as 10 lamp flashes |
The auto-lifting panel has not closed properly. | Minor fault |
| J0 (Cascade (URC/CRE), UltraSlim (URC/LRE) and UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The evaporator coil temperature is too high and the unit has stopped to protect itself. | Fault – service needed |
| J1 (Cascade (URC/CRE), UltraSlim (URC/LRE) and UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The condenser coil temperature is too high and the unit has stopped to protect itself. | Fault – service needed |
| J2 (Cascade (URC/CRE), UltraSlim (URC/LRE) and UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The compressor discharge temperature is too high and the unit has stopped to protect itself. | Fault – service needed |
| J3 (Cascade (URC/CRE), UltraSlim (URC/LRE) and UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The power factor correction (PFC) module in the outdoor unit has tripped a protection. | Fault – service needed |
| J4 (Cascade (URC/CRE), UltraSlim (URC/LRE) and UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The outdoor unit’s main board has lost communication with the compressor drive board. | Fault – service needed |
| J5 (Cascade (URC/CRE), UltraSlim (URC/LRE) and UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The high pressure protection has tripped, usually because the outdoor unit cannot get rid of heat. | Fault – service needed |
| J6 (Cascade (URC/CRE), UltraSlim (URC/LRE) and UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The low pressure protection has tripped, usually because the system is low on refrigerant. | Fault – service needed |
| J8 (Cascade (URC/CRE), UltraSlim (URC/LRE) and UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The incoming AC power voltage is outside safe limits and the unit has stopped. | Fault – service needed |
| LP (UltraSlim R-32 (URC/LRE/LRC) systems (outdoor unit display)) | The unit has stopped because the outdoor temperature is too low for safe operation. | Normal operation |
| P0 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display) and multi-split indoor units (MRE/BRE) (1 lamp flash)) also shown as 1 lamp flash |
The inverter power module (IPM) has detected a fault or excessive current and shut the compressor down. | Fault – service needed |
| P0 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The evaporator (indoor coil) temperature protection has tripped. | Minor fault |
| P1 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display) and multi-split indoor units (MRE/BRE) (2 lamp flashes)) also shown as 2 lamp flashes |
The supply voltage to the unit is too high or too low. | Fault – service needed |
| P1 (Multi-split outdoor units (MRC): models MRC-100AS-4, MRC-110AS-5 and MRC-135AS-5 only) | The high pressure protection has tripped, usually because the outdoor unit cannot get rid of heat. | Fault – service needed |
| P1 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The unit is in defrost or anti-cold-draught mode, which is normal operation rather than a fault. | Normal operation |
| P2 (Aurora (SWB) and Serene (WRC/WRE) wall splits (Aurora SWB52C and SWB70C only), Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems and the UltraSlim R-32 outdoor display (3 lamp flashes)) also shown as 3 lamp flashes |
The compressor (or on some models the inverter module) has overheated and the unit has shut down to protect it. | Fault – service needed |
| P2 (Multi-split outdoor units (MRC): models MRC-100AS-4, MRC-110AS-5 and MRC-135AS-5 only) | The low pressure protection has tripped, usually because the system is low on refrigerant. | Fault – service needed |
| P2 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The condenser temperature protection has tripped. | Fault – service needed |
| P3 (Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, 4 lamp flashes)) also shown as 4 lamp flashes |
The unit has stopped because the outdoor temperature is too low for safe operation. | Normal operation |
| P3 (Multi-split outdoor units (MRC)) | The outdoor unit is drawing too much electrical current and has shut down to protect itself. | Urgent – turn it off |
| P3 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The compressor temperature protection has tripped. | Fault – service needed |
| P4 (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including compressor rotor position protection, and the UltraSlim R-32 outdoor display) and multi-split indoor units (MRE/BRE) (5 lamp flashes)) also shown as 5 lamp flashes |
The inverter compressor drive has reported an error and stopped the compressor. | Fault – service needed |
| P4 (Multi-split outdoor units (MRC); also shown as P4 (discharge pipe temperature protection) on the WC-02 wired controller) | The compressor discharge temperature is too high and the unit has stopped to protect the compressor. | Fault – service needed |
| P5 (Multi-split systems (MRE/BRE indoor units, 6 lamp flashes)) also shown as 6 lamp flashes |
Two indoor units are asking for opposite modes (one heating, one cooling), which the system cannot do at the same time. | Normal operation |
| P5 (Multi-split outdoor units (MRC)) | The condenser temperature is too high and the unit has stopped to protect itself. | Fault – service needed |
| P5 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The discharge high pressure protection has tripped. | Fault – service needed |
| P6 (Multi-split systems (MRE/BRE indoor units, 7 lamp flashes)) also shown as 7 lamp flashes |
The outdoor unit has tripped on a high or low refrigerant pressure fault (the outdoor display shows J5 for high pressure or J6 for low pressure). | Fault – service needed |
| P6 (Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor display, 7 lamp flashes)) also shown as 7 lamp flashes |
The compressor voltage protection has tripped. | Fault – service needed |
| P6 (Multi-split outdoor units (MRC)) | The inverter power module (IPM) has tripped a protection and stopped the compressor. | Fault – service needed |
| P6 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The discharge low pressure protection has tripped, usually because the system is low on refrigerant. | Fault – service needed |
| P7 (Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, 8 lamp flashes) and the UltraSlim R-32 outdoor display) also shown as 8 lamp flashes |
The outdoor inverter (IGBT) temperature sensor is faulty (open or short circuit). | Minor fault |
| P7 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The over-voltage protection has tripped. | Fault – service needed |
| P8 (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | The compressor overload protection has tripped. | Fault – service needed |
| PC00 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 7 lamp flashes |
The inverter power module has detected a fault or excessive current and shut the compressor down. | Fault – service needed |
| PC01 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 2 lamp flashes |
The supply voltage to the unit is too high or too low. | Fault – service needed |
| PC02 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 3 lamp flashes |
The compressor or inverter module has overheated and the unit has shut down to protect itself. | Fault – service needed |
| PC03 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 7 lamp flashes |
The system has tripped on a high or low refrigerant pressure fault (some models). | Fault – service needed |
| PC04 (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes) also shown as 5 lamp flashes |
The inverter compressor drive has reported an error and stopped the compressor. | Fault – service needed |
| PF (Systems with the WC-02 wired wall controller (Cascade and UltraSlim ducted and cassette units)) | A fault has occurred elsewhere in the system; check the indoor or outdoor unit display for the detailed code. | Minor fault |
| dF (Serene Series 2 wall split indoor units (also shown as dEF on ducted outdoor displays)) | The unit is running a normal defrost cycle in heating mode, not a fault. | Normal operation |
Codes that mean switch the system off
If your ActronAir unit shows EC, F0, P3, EL0C, E60, E74, E74, E79, turn the system off at the isolator and leave it off. These faults involve the compressor, refrigerant or electrical protection, and running the unit can cause further damage.
The most serious ActronAir fault codes explained
What does ActronAir fault code EC mean? (Aurora (SWB) and Serene (WRC/WRE) wall splits and Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (7 lamp flashes))
The system has detected a possible refrigerant leak.
Likely causes:
- Refrigerant leak in the piping or coils
- Faulty leak detection sensor
Safe checks before you call:
- Stop using the unit and switch it off at the isolator or breaker
- Open windows to ventilate the room
- Do not use open flames near the indoor unit
What does ActronAir fault code F0 mean? (Serene (WRC/WRE) wall splits and Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (some units, 1 lamp flash); also the outdoor display on Cascade, UltraSlim and UltraSlim R-32 systems)
Overcurrent or overload protection has tripped.
Likely causes:
- Power surge or unstable supply voltage
- Compressor or fan motor drawing excess current
- Electrical fault on the outdoor unit
Safe checks before you call:
- Turn the system off at the isolator for 5 minutes, then restart it once. If F0 returns, leave the system off.
What does ActronAir fault code P3 mean? (Multi-split outdoor units (MRC))
The outdoor unit is drawing too much electrical current and has shut down to protect itself.
Likely causes:
- Compressor working too hard due to blocked airflow
- Power supply problem
- Failing compressor
Safe checks before you call:
- Look at the outdoor unit and make sure leaves, grass or objects are not blocking the airflow (do not open the unit)
- Clean or check the return air filter is not clogged
- Turn the system off at the isolator or breaker, wait 5 minutes, then restart it
What does ActronAir fault code EL0C mean? (Cascade R-32 (URC/CRC) and UltraSlim R-32 (URC/LRE/LRC) systems; Serene Series 2 R-32 wall splits show the same codes)
The system has detected a possible refrigerant leak (some models).
Likely causes:
- Refrigerant leak in the piping or coils
- Faulty leak detection sensor
Safe checks before you call:
- Stop using the unit and switch it off at the isolator or breaker
- Open windows to ventilate the room
- Do not use open flames near the indoor unit
What does ActronAir fault code E60 mean? (Advance, Aires and QUE three phase ducted systems)
The compressor drive has detected excessive current in a compressor phase and shut down.
Likely causes:
- Compressor winding or wiring fault
- Compressor drive fault
- Compressor working too hard due to blocked airflow
Safe checks before you call:
- Look at the outdoor unit and make sure leaves, grass or objects are not blocking the airflow (do not open the unit)
- Clean or check the return air filter is not clogged
- Turn the system off at the isolator or breaker, wait 5 minutes, then restart it
What does ActronAir fault code E74 mean? (Advance and Aires ducted systems)
The drive has tripped on IGBT overcurrent, which can point to a choke wiring problem or failure.
Likely causes:
- Choke wiring problem or choke failure
- Drive power electronics fault
- Compressor winding fault
Safe checks before you call:
- Turn the system off at the isolator or breaker, wait 5 minutes, then restart it
What does ActronAir fault code E79 mean? (Advance and Aires ducted systems)
The drive has tripped a hardware overcurrent (IPM) protection on the compressor.
Likely causes:
- Drive power electronics fault
- Compressor winding fault
- Failing compressor
Safe checks before you call:
- Turn the system off at the isolator or breaker, wait 5 minutes, then restart it
What does ActronAir fault code E0 mean? (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems and multi-split indoor units (MRE/BRE) (1 lamp flash))
The indoor unit’s memory chip (EEPROM) has a parameter error.
Likely causes:
- Corrupted indoor board memory
- Indoor control board fault
Safe checks before you call:
- Turn the system off at the isolator or breaker, wait 5 minutes, then restart it
What does ActronAir fault code E1 mean? (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems (indoor and outdoor displays, including the UltraSlim R-32 outdoor display), multi-split indoor units (MRE/BRE) (2 lamp flashes) and the WC-02 wired controller)
The indoor and outdoor units have lost communication with each other.
Likely causes:
- Damaged or loose interconnecting cable
- Power interruption to the outdoor unit
- Indoor or outdoor board fault
Safe checks before you call:
- Check the outdoor unit isolator switch (next to the outdoor unit) is switched on
- Turn the system off at the isolator or breaker, wait 5 minutes, then restart it
What does ActronAir fault code E3 mean? (Aurora (SWB) and Serene (WRC/WRE) wall splits, Cascade (URC/CRE) and UltraSlim (URC/LRE) split ducted and cassette systems and multi-split indoor units (MRE/BRE) (4 lamp flashes))
The indoor fan is not running at the correct speed.
Likely causes:
- Faulty indoor fan motor
- Fan obstruction
- Indoor control board fault
Safe checks before you call:
- Clean or check the return air filter is not clogged
- Turn the system off at the isolator or breaker, wait 5 minutes, then restart it
What does ActronAir fault code E8 mean? (Cascade (URC/CRE) and UltraSlim (URC/LRE) twin systems (indoor display, 9 lamp flashes))
The master and slave indoor units of a twin system have lost communication with each other.
Likely causes:
- Interconnecting cable fault between the twin indoor units
- Indoor PCB fault
Safe checks before you call:
- Turn the system off at the isolator or breaker, wait 5 minutes, then restart it
What does ActronAir fault code E9 mean? (Cascade (URC/CRE) and UltraSlim (URC/LRE) twin systems (indoor display, 10 lamp flashes))
Another indoor unit in the twin system has a fault.
Likely causes:
- A fault on the other indoor unit of the twin pair
- Communication fault between the twin units
Safe checks before you call:
- Check the other indoor unit’s display for its own fault code and look that code up
Fault confirmed? Here is what to do next
A fault code is the starting point, not the fix. Start here:
- Air conditioner repairs – how we diagnose and fix ActronAir faults across Adelaide. Our fault find covers the full diagnosis, and it is on us if you go ahead with the repair.
- Repair or replace calculator – whether fixing your current system is the smarter money.
- Service and maintenance – regular servicing prevents most of the faults on this page.
- Air conditioner fault code lookup – all 15 brands in one place.
- All calculators and tools
Call us on 08 8296 7888 or book online and we will call or text you back ASAP.
Sources for this page
Every ActronAir code above is checked against these Australian documents. Open them yourself to verify anything on this page:
- ActronAir Product Fault Codes (PDF) (docs.actronair.com.au)
- e1 error code wc 02 controller (actronair.com.au)
- e1 error code wc 02 controller ultraslim (actronair.com.au)
- actronair air conditioner error codes (valleyairconditioning.com.au)
- actronair air conditioner error codes (airconditioningmackay.com.au)
- ec error code wc 02 controller (actronair.com.au)
- ee error code wc 02 controller (actronair.com.au)
- e3 error code wc 02 controller (actronair.com.au)
- e3 error code wc 02 controller ultraslim (actronair.com.au)
- el01 whs indoor unit (actronair.com.au)
- eh03 whs indoor unit (actronair.com.au)
- el0c whs indoor unit (actronair.com.au)
ActronAir fault code FAQs
Where do I find the fault code on a ActronAir air conditioner?
Check the remote or wall controller display first. Some models flash the indoor unit’s lamps in a pattern instead; the table above lists documented lamp patterns alongside their codes. If nothing is showing, the code may only appear while the fault is active.
Can I clear a ActronAir fault code myself?
You can reset the system by turning it off at the isolator or breaker for five minutes. If the code stays gone, it was a one-off. If it returns, the fault is real and needs a licensed technician, and repeated resets can cause further damage on compressor or refrigerant faults.
Does a ActronAir fault code mean I need a new air conditioner?
Usually not. Most codes point to repairable faults like sensors, fan motors or drainage. Our fault find gives you an honest verdict either way, and the fee is credited if you repair with us.
Are these ActronAir fault codes correct for Australian models?
Yes. Every code on this page was checked against Australian documentation (docs.actronair.com.au, actronair.com.au, valleyairconditioning.com.au), not overseas lists, because the same code can mean different things in different markets. Meanings still vary between model series, so treat this page as reference and cross-check your unit’s manual.
Written by Oliver Hastings, T&K Airpower. Last updated 01/08/2026. Compiled from Australian sources including docs.actronair.com.au, actronair.com.au, valleyairconditioning.com.au, airconditioningmackay.com.au, so you can check every code against the official documentation. Fault code meanings vary between model series and controllers, so treat this page as reference only and never remove panels or work on the refrigeration or electrical parts of the system yourself.
