Product troubleshooting
Airquest D5FSDAH18XAK troubleshooting and error codes
These codes are matched from manufacturer documentation to this model's series or control platform. Keep checks visible and safe; do not open electrical, refrigerant, gas, combustion, or sealed equipment compartments.
Source-backed code set
31 matched codes
| Code | Meaning | System area | Priority |
|---|---|---|---|
| EC07 | Outdoor-unit fan speed out of control | Outdoor fan | Service |
| EC51 | Outdoor-unit EEPROM parameter error | Outdoor control | Service |
| EC52 | Outdoor-unit coil temperature sensor error | Outdoor coil sensor T3 | Service |
| EC53 | Outdoor-unit ambient temperature sensor error | Outdoor ambient sensor T4 | Service |
| EC54 | Compressor discharge temperature sensor error | Compressor discharge sensor TP | Service |
| EC56 | Indoor-unit coil temperature sensor error | Indoor coil sensor T2B | Service |
| ECC1 | Another indoor unit detects refrigerant leakage | Refrigerant detection | Urgent |
| EH00 | Indoor-unit EEPROM malfunction | Indoor control | Service |
| EH03 | Indoor-unit fan speed out of control | Indoor fan | Service |
| EH0A | Indoor-unit EEPROM parameter error | Indoor control | Service |
| EH0E | Water-level alarm malfunction | Condensate drainage | Urgent |
| EH12 | Main unit or secondary units malfunction | Multi-unit control | Service |
| EH3A | External fan DC bus voltage too low protection | External fan power | Service |
| EH3b | External fan DC bus voltage too high fault | External fan power | Service |
| EH60 | Indoor-unit room temperature sensor error | Indoor room sensor T1 | Service |
| EH61 | Indoor-unit coil temperature sensor error | Indoor coil sensor T2 | Service |
| EHba | Indoor unit and external fan module communication error | Communication | Service |
| EHC1 | Refrigerant sensor detects leakage | Refrigerant detection | Urgent |
| EHC2 | Refrigerant sensor out of range with leakage detected | Refrigerant detection | Urgent |
| EHC3 | Refrigerant sensor out of range | Refrigerant detection | Urgent |
| EL01 | Indoor and outdoor unit communication error | Communication | Service |
| EL0C | System lacks refrigerant | Refrigerant circuit | Urgent |
| EL11 | Main and secondary units communication malfunction | Multi-unit communication | Service |
| FH07 | Lift-panel communication or opening and closing failure | Lift panel | Service |
| FHCC | Refrigerant sensor error | Refrigerant detection | Urgent |
| PC00 | Outdoor-unit IPM module protection | Inverter power module | Urgent |
| PC01 | Outdoor-unit voltage protection | Outdoor power | Urgent |
| PC02 | Compressor temperature or IPM module protection | Compressor or inverter power module | Urgent |
| PC03 | Low- or high-pressure protection | Refrigerant pressure | Urgent |
| PC04 | Inverter compressor drive error | Compressor drive | Urgent |
| PC0L | Low ambient temperature protection | Low ambient protection | Notice |
No matching error codes found.