HVACopediaKinghome heat pump error codes
55 codes with causes and test steps.
| Code | Meaning | Severity |
|---|---|---|
| A1 | Outdoor fan IPM module protection | High |
| C4 | ODU jumper cap error | Medium |
| C5 | Jumper cap missing or wrong | Medium |
| C8 | ODU drive jumper cap error | Medium |
| E1 | High pressure protection / high-pressure sensor fault | High |
| E2 | Indoor coil anti-freeze protection | Medium |
| E3 | Low pressure protection / low-pressure sensor fault | High |
| E4 | Compressor discharge temperature too high | High |
| E5 | Overcurrent protection | Medium |
| E6 | Indoor/outdoor communication fault | High |
| E8 | High temperature resistance (overload) protection | Medium |
| E9 | Water overflow protection | Medium |
| F0 | Refrigerant recovery mode | Low |
| F1 | Indoor room temperature sensor fault | Medium |
| F2 | Sensor fault (indoor coil or outdoor condenser) | Medium |
| F3 | Outdoor ambient temperature sensor fault | Medium |
| F4 | Sensor fault (outdoor condenser or discharge) | Medium |
| F5 | Outdoor discharge temperature sensor fault | Medium |
| F6 | Frequency limit for overload / ODU tube sensor fault | Medium |
| F8 | Frequency reduced - overcurrent | Low |
| F9 | Frequency reduced - high discharge temperature | Low |
| H3 | Compressor overload protection | High |
| H4 | Overload protection (high condensing pressure) | High |
| H5 | IPM module protection | Critical |
| H6 | Fan motor feedback fault (indoor or outdoor) | High |
| H7 | Compressor out-of-step | High |
| L3 | Outdoor DC fan motor fault | High |
| L9 | Power limit protection | Medium |
| P0 | Compressor minimum-frequency test / driver reset | Low |
| P1 | Compressor rated-frequency test display | Low |
| P2 | Compressor maximum-frequency test display | Low |
| P3 | Compressor intermediate-frequency test display | Low |
| P5 | Compressor phase overcurrent | High |
| P6 | Main-to-driver communication error | High |
| P7 | Module temperature sensor circuit fault | Medium |
| P8 | Power module over-temperature | High |
| U1 | Compressor phase current detection circuit fault | High |
| U3 | DC bus voltage drop fault | Medium |
| U5 | Whole-unit current detection fault | High |
| U7 | Four-way valve abnormal | High |
| AC | Outdoor fan startup failure | High |
| AE | Outdoor fan current detection error | High |
| AJ | Outdoor fan out-of-step | High |
| EE | Memory chip fault | High |
| EU | Frequency reduced - module too hot | Low |
| FH | Frequency reduced - anti-freeze | Low |
| HC | PFC protection | High |
| LC | Compressor start failure | High |
| LP | Indoor and outdoor unit mismatch | High |
| PA | AC current protection | High |
| PH | DC bus voltage high | High |
| PL | DC bus voltage low | High |
| PU | Capacitor charging failure | High |
| Pc | Drive current detection error | High |
| UL | Outdoor fan overcurrent | High |
Models covered
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For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.