Lennox M22A Error Codes
Mini-split unit · Split & Multi-Split
Model numbers in this family: M22A, M33A, M33B, MCFA, MCFB, MMDA, MMDB
- E0 Indoor unit EEPROM error
- E1 Communication error between indoor and outdoor units (E2 for outdoor code)
- E3 Indoor fan speed error
- E4 Indoor return air temperature sensor error
- E5 Indoor coil temperature sensor error
- EC Low refrigerant
- EE High water level alarm (cassette units with factory pumps)
- F0 Outdoor current overload sensed Note: (outdoor unit display --) two dashes
- F1 Outdoor ambient temperature sensor error (T4 malfunction) outdoor unit display E4
- F2 Outdoor coil temperature sensor error (T3) Malfunction outdoor unit display E4
- F3 Compressor discharge temperature sensor error (T5) Malfunction outdoor unit display E4
- F4 Outdoor unit EEPROM error - outdoor display E0
- F5 Outdoor unit fan speed error - outdoor Error display E8
- P0 Inverter module IPM error - outdoor display P6
- P1 High or low voltage protection - outdoor display E5
- P3 Outdoor unit low temperature lockout - outdoor unit display LP
- P4 Compressor drive error
- P6 Mode conflict
- P7 Compressor highor low-pressure switch open - outdoor unit display P2
- SC Indoor unit is running a self clean operations.
Reference only. Confirm against the manual for your exact model. Data release 105f66ecb9e96e5dc473025d.