The codes listed below refer to the LED display on HYA Midwall air conditioners. For other models of air conditioners, please consult your air conditioner supplier.
| Display | Description | |
|---|---|---|
| dF | Defrost function: cycling in order to remove ice build-up | |
| E1 | Outdoor unit tube temperature sensor fault | |
| E2 | Indoor temperature sensor fault | |
| E3 | Coil temperature sensor fault | |
| E6 | Communication failure | |
| E7 | External feedback fault | |
| FF | Outside temp too cold to operate | |
| F1 | Communication between indoor and outdoor faulty | |
| F2 | Indoor ambient temperature sensor fault | |
| F3 | Indoor coil temperature sensor fault (possibly include inlet/middle pipe/outlet) | |
| F4 | Indoor fan fault | |
| F5 | Outdoor module fault | |
| F6 | Outdoor ambient temperature sensor fault | |
| F7 | Outdoor coil temperature sensor fault | |
| F8 | Compressor suction temperature sensor fault | |
| F9 | Compressor discharge temperature sensor fault | |
| FA | Current or voltage fault | |
| FC | Compressor fault | |
| FD | Supply phase missing or phase sequence fault | |
| FF | Short of refrigerant | |
| P1 | Evaporator (indoor) temperature protection | |
| P2 | Overheat/overcurrent protection (inverter model only) | |
| P3 | Overcurrent protection | |
| P4 | Compressor discharge temperature protection | |
| P5 | Compressor over heat cut out protection | |
| P6 | Compressor suction temperature protection | |
| P7 | Over/under voltage protection | |
| F9 | High pressure discharge protection | |
| PA | Condenser (outdoor) high temperature protection | |
| PC | Outdoor high ambient temperature protection | |
| PF | Unknown fault protection | |
For other air conditioning issues, please contact an approved installer in your area.