Lennox MCFA036S4-*P

96
Table 9. Indoor Unit Fault Codes (09/24)
Running Light
Short Flashes
State of
Timer Light
Display Description
1 time OFF E0 IndoorunitEEPROMerror
2 times OFF E1 Communicationerrorbetweenindoorandoutdoorunits
4times OFF E3 Indoor fan speed error
5 times OFF E4 Indoor return air temperature sensor error
6 times OFF E5 Indoor coil temperature sensor error
7 times OFF EC Lowrefrigerant
8 times OFF EE Highwaterlevelalarm
1 time ON F0 Outdoorcurrentoverloadsensed
2 times ON F1 Outdoorambienttemperaturesensorerror
3 times ON F2 Outdoorcoiltemperaturesensorerror
4times ON F3 Compressordischargetemperaturesensorerror
5 times ON F4 OutdoorunitEEPROMerror
6 times ON F5 Outdoorunitfanspeederror
1 time Flash P0 Inverter module IPM error
2 times Flash P1 Highorlowvoltageprotection
4times Flash P3 Outdoorunitlowtemperaturelockout
5 times Flash P4 Compressor drive error
6 times Flash -- Modeconict
7 times Flash P6 Compressorhigh-orlow-pressureswitchopen.
Table 10. Indoor Unit Fault Codes (09/30-48)
Running Light
Short Flashes
State of
Timer Light
Display Description
1 time OFF E0 IndoorunitEEPROMerror
2 times OFF E1 Communicationerrorbetweenindoorandoutdoorunits
4times OFF E3 Indoor fan speed error
5 times OFF E4 Indoor return air temperature sensor error
6 times OFF E5 Indoor coil temperature sensor error
7 times OFF EC Lowrefrigerant
8 times OFF EE Highwaterlevelalarm
1 time ON F0 Outdoorcurrentoverloadsensed
2 times ON F1 Outdoorambienttemperaturesensorerror
3 times ON F2 Outdoorcoiltemperaturesensorerror
4times ON F3 Compressordischargetemperaturesensorerror
5 times ON F4 OutdoorunitEEPROMerror
6 times ON F5 Outdoorunitfanspeederror
1 time Flash P0 Inverter module IPM error
2 times Flash P1 Highorlowvoltageprotection
4times Flash P3 Outdoorunitlowtemperaturelockout
5 times Flash P4 Compressor drive error
7 times Flash P6 Compressorhigh-orlow-pressureswitchopen.
8 times Flash P7 OutdoorIGBTtemperaturesensorerror