Lennox M0STAT61Q-1 - Troubleshooting; Fault Codes

10
Troubleshooting
Table 2. Fault Codes (Indoor
Unit)
Code Description
E0 Indoor unit EEPROM error
E1 Communication error
between indoor unit and
outdoor unit
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
F0 Outdoor current overload
sensed
F1 Outdoor ambient
temperature sensor error
F2 Outdoor coil temperature
sensor error
F3 Compressor discharge
temperature sensor error
F4 Outdoor unit EEPROM error
Table 2. Fault Codes (Indoor
Unit)
Code Description
F5 Outdoor unit fan speed error
P0 Inverter module IPM error
P1 High or low voltage
protection
P3 Outdoor unit low temperature
lockout
P4 Compressor drive error
-- Mode conict
P6 Compressor high-pressure or
low-pressure switch open