Lennox SL22KLV Error Codes
Heat pump · Split & Multi-Split
Model numbers in this family: SL22KLV, SL22KLV-024, SL22KLV-036, SL22KLV-048, SL22KLV-060
- 84 Power-up unit identification code for SL22KLV-024.
- 85 Power-up unit identification code for SL22KLV-036.
- 86 Power-up unit identification code for SL22KLV-048.
- 87 Power-up unit identification code for SL22KLV-060.
- C50 Example of compressor cooling capacity demand at 50 percent.
- 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 iComfort thermostat has lost communication with the outdoor unit for more than 3…
- E125 There is a hardware problem with the outdoor control.
- E131 The outdoor unit control parameters are corrupted.
- E132 Internal software error.
- E180 The iComfort thermostat has found a problem with the outdoor unit's ambient temperature…
- E181 Suction pressure transducer fault.
- E182 Suction Temperature Sensor has malfunctioned
- E183 Liquid Pressure Transducer Fault
- E184 Faulty outdoor liquid line sensor
- E186 Discharge temperaure too low
- E187 Discharge temperature/pressure too high
- 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 protection logic.
- 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…
- 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 during compressor operation. Occurs when…
- 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.
- E444 Reversing valve position error
- E480 EEV control board fault
- E481 Discharge pressure transducer fault. Discharge pressures sensor signal is out of range.…
- E482 Compressor Suction Temperature Sensor has malfunctioned. Check temperature sensor…
- E484 System EEV coil current too low. Heat pump operation can continue. Check system EEV coil…
- E485 System EEV coil currrent too high. Heat pump heating operation stopped. Check system EEV…
- E486 System superheat below 3 degrees F for more than 10 minutes. Heat pump heating operation…
- E487 System superheat higher than 40 degrees F for more than 10 minutes. Heat pump heating…
- E490 Injection EEV coil current too high
- E600 Compressor has been cycled OFF by utility load-shedding function.
- E601 Outdoor unit has been cycled OFF on low temperature protection (-20°F).
- H50 Example of compressor heating capacity demand at 50 percent.
- 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.
- three bars Unit type or capacity not determined, or unit not programmed; read the current power-up…
Reference only. Confirm against the manual for your exact model. Data release 105f66ecb9e96e5dc473025d.