Lennox SL28XCV Error Codes
Air conditioner · Split & Multi-Split
Model numbers in this family: SL28XCV, SL28XCV-024, SL28XCV-036, SL28XCV-048, SL28XCV-060
- C50 Compressor capacity demand percentage; source example C50 is 50% demand with S30…
- E105 The outdoor control has lost communication with either the thermostat or indoor unit.
- E120 There is a delay in the outdoor unit responding to the system.
- E124 The S30 thermostat has lost communication with the outdoor unit for more than 3 minutes.
- E125 There is a hardware problem with the outdoor control.
- E131 The outdoor unit control parameters are corrupted.
- E132 Internal software error.
- E180 The S30 thermostat has found a problem with the outdoor unit's ambient temperature sensor.
- E181 Suction pressure transducer fault.
- E182 Suction Temperature Sensor has malfunctioned
- E183 Liquid Pressure Transducer Fault
- E184 Faulty outdoor liquid line sensor
- E345 Heat Pump or Air Conditioner Alert Code - The "O" relay on the outdoor board has failed.
- E409 Outdoor control secondary voltage is 18VAC or less.
- E410 The outdoor unit cycled off due to low pressure switch opening.
- E411 The low pressure fault has occurred 5 times within one hour. As a result, the outdoor…
- E412 The outdoor unit high pressure switch has opened.
- E413 The high pressure switch has opened 5 times within one hour. As a result, the outdoor…
- E416 The outdoor coil sensor has malfunctioned.
- E422 Compressor top cap switch exceeding thermal limit.
- E423 The inverter has detected a circuit problem.
- E424 The liquid line temperature sensor has malfunctioned.
- E425 Outdoor control has increased minimum compressor speed to allow for proper oil return due…
- E426 Excessive inverter alarms
- E427 The inverter has detected a DC peak fault condition.
- E428 The inverter has detected a high main input current condition.
- E429 On a call for compressor operation, if DC link power in inverter does not rise above 180…
- E430 Compressor start failure
- E431 Error occurs when PFC detects an over-current condition of 100A, the control will display…
- E432 The inverter has detected a DC link high voltage condition.
- E433 The inverter has detected a compressor over-current condition.
- E434 Outdoor control has lost communications with the inverter for greater than 3 minutes.…
- E435 Inverter internal error.
- E436 Inverter heat sink temperature exceeded limit. Occurs when the heat sink temperature…
- E437 Heat sink temperature sensor fault has occurred (temperature less than 4 ºF or greater…
- E438 The inverter has detected a PFC over current condition. This would be caused by a high…
- E439 Compressor slowdown due to high input current.
- E440 Heat sink temperature is approaching limit. The compressor speed automatically slows to…
- E441 Compressor slowdown due to high compressor current. Compressor current is approaching…
- E442 The top cap switch has opened 5 times within one hour. As a result, the outdoor unit is…
- E443 Incorrect appliance unit size code selected.
- E600 Compressor has been cycled OFF by utility load-shedding function.
- E601 Outdoor unit has been cycled OFF on low temperature protection.
- H50 Compressor capacity demand percentage; source example H50 is 50% demand with S30…
- Pd Pump down mode.
- Red OFF, Green OFF Indicates inverter is NOT energized.
- Red ON, Green OFF Indicates inverter is operating normally.
- Red ON, Green ON [MODEL]-036, -048, -060 only: Indicates inverter is operating normally.
Reference only. Confirm against the manual for your exact model. Data release 105f66ecb9e96e5dc473025d.