Your Concealed Ducted Multi-Zone system is equipped with a built-in self-diagnostic function. When the system detects a potential operating issue, a specific error code—usually a combination of letters and numbers—may appear on the wired controller, indoor unit, or outdoor unit.
This guide will help you identify the meaning of each error code and determine which part of the system may require attention. Find the code displayed on your system in the table below, then refer to the corresponding troubleshooting instructions.
| Code | Reason |
|---|---|
| E0 | IDU & ODU Communication Failure |
| E1 | IDU Room Temperature Sensor Failure. (Wired Controller Sensor Failure) |
| E2 | IDU Coil Temperature Sensor Failure. (IDU IPT Failure) |
| E3 | ODU Coil Temperature Sensor Failure. (OPT) |
| E4 | AC Cooling System Abnormal |
| E5 | IDU/ODU Mismatched Failure (Specially Performance Test on the Production Line) |
| E6 | IDU PG Fan Motor / DC Fan Motor Works Abnormal (IDU Failure) |
| E7 | ODU Ambient Temperature Sensor Failure. |
| E8 | ODU Discharge Temperature Sensor Failure. |
| E9 | IPM / Compressor Driving Control Abnormal. |
| EA | ODU Current Test Circuit Failure. |
| Eb | The Communication Abnormal of Main PCB and Display Board (IDU Failure) |
| EC | ODU Modules Communication Failure |
| EE | ODU EEPROM Failure. |
| EF | ODU DC Fan Motor Failure. |
| EH | ODU Suction Temperature Sensor Failure. |
| EP | ODU Compressor Casing Top Failure. |
| EU | ODU Voltage Test Circuit Abnormal. |
| Ej | ODU Central Coil Temperature Sensor Failure. |
| En | ODU Gas Pipe Temperature Sensor Failure. |
| Ey | ODU Liquid Pipe Temperature Sensor Failure |
| P0 | IPM Module Protection. |
| P1 | Over / Under Voltage Protection. |
| P2 | Over Current Protection. |
| P4 | ODU Discharge Pipe Over Temperature Protection. |
| P5 | Sub-Cooling Protection on Cooling Mode. |
| P6 | Overheating Protection on Cooling Mode. |
| P7 | Overheating Protection on Heating Mode. |
| P8 | Outdoor Over Temperature / Under Temperature Protection. |
| P9 | Compressor Drving Protection. (Load Abnormal) |
| PA | Communication Failure / Mode Conflict |
| F0 | Infrared Customer Feeling Test Sensor Failure. (IDU Failure) |
| F1 | Electric Power Test Module Failure. (IDU Failure) |
| F2 | Discharge Temperature Sensor Failure Protection. |
| F3 | ODU Coil Temperature Failure Protection. |
| F4 | Cooling System Gas Flow Abnormal Protection. |
| F5 | PFC Protection. |
| F6 | Compressor Lack of Phase / Anti-Phase Protection. |
| F7 | IPM Module Temperature Protection. |
| F8 | 4-Way Valve Reversing Abnormal. |
| F9 | The Module Temperature Test Circuit Failure. |
| FA | The Compressor Phase-Current Test Circuit Failure. |
| Fb | Limiting/Reducing Frequency for Overload Protection on Cooling/Heating Mode. |
| FC | Limiting/Reducing Frequency for High Power Consumption Protection. |
| FE | Limiting/Reducing Frequency for Module Current Protection. (Compressor Phase Current) |
| FF | Limiting/Reducing Frequency for Module Temperature Protection. |
| FH | Limiting/Reducing Frequency for Compressor Driving Protection. |
| FP | Limiting/Reducing Frequency for Anti-Condensation Protection. |
| FU | Limiting/Reducing Frequency for Anti-Frost Protection. |
| Fj | Limiting/Reducing Frequency for Discharge Over Temperature Protection. |
| Fn | Limiting/Reducing Frequency for ODU AC Current Protection. |
| Fy | Gas Leakage Protection. |
| bf | TVOC Sensor Failure (IDU Failure, Optional) |
| bc | PM2.5 Sensor Failure (IDU Failure, Optional) |
| bj | Humidity Sensor Failure (IDU Failure) |
| Fd | The Communication Of The Refrigerant Sensor Is Abnormal. |
| Hd | Refrigerant Leak Protection. |
| d4 | Water Full Protection |
| d5 | Access Control Protection |
| H1 | High Pressure Switch Malfunction (HP). |
| H2 | Low Pressure Switch Malfunction (LP). |
| CL | Filter Duty Remind. |
For detailed, step-by-step solutions for all the codes listed above, please view the complete troubleshooting guide.
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