Lennox EL21KLV Error Codes

Heat pump · Split & Multi-Split

Model numbers in this family: EL21KLV, EL21KLV-024, EL21KLV-036, EL21KLV-048, EL21KLV-060

• C1 Compressor capacity status C 1 or C 2 while running with conventional 24VAC…
• C2 Compressor capacity status C 1 or C 2 while running with conventional 24VAC…
• CAN LED (Green) - LED Flickers Compressor capacity demand percentage; source example CAN LED (Green) - LED Flickers is…
• CAN LED (Green) - Off Compressor capacity demand percentage; source example CAN LED (Green) - Off is 50% demand…
• D10 Status LED (Green) - 1s On, 1s Off Normal Heartbeat of the EEV Controller Firmware
• D10 Status LED (Green) - Off No Heartbeat
• D11 EEV LED (Orange) - 10Hz Blink (10 Blinks per Second) Indicates EEV is Moving (Open or Closed)
• D11 EEV LED (Orange) - On EEV overcurrent is reported from the EEV stepper motor.
• 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 Equipment lost communication
• 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 suction pressure.
• E411 L The low pressure switch has opened 5 times within one hour. As c a result, the outdoor…
• E412 The outdoor unit high pressure switch has opened.
• E413 The high pressure switch has T 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. 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.
• E444 Reversing valve position does not match the position commanded by the outdoor control.…
• E480 The EEV control board has stopped communicating with the outdoor control. Heat pump…
• 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…
• E600 Compressor has been cycled OFF by utility load-shedding function.
• E601 Outdoor unit has been cycled OFF on low temperature protection.
• Red OFF, Green OFF Indicates inverter is NOT energized.
• Red ON, Green OFF Indicates inverter is operating normally.
• Red ON, Green ON [MODEL]-048, -060 only: Indicates inverter is operating normally.

Reference only. Confirm against the manual for your exact model. Data release 105f66ecb9e96e5dc473025d.