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Model reference

Lennox XC25-024-230-02

Air Conditioner

1 document38 error codes6 service modes

Available documentation

Service Manual

  • XC25 Installation and Service Procedure78 pg
    Covers this model
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Error codes (38)

CodeMeaning
E105The outdoor control has lost communication with either the thermostat or indoor…E120There is a delay in the outdoor unit responding to the system.E124The iComfort Wi-Fi thermostat has lost communication with the outdoor unit for…E125There is a hardware problem with the outdoor control.E131The outdoor unit control parameters are corrupted.E132Internal software error in the outdoor control.E180The outdoor unit ambient temperature sensor has malfunctioned; outdoor unit…E345The O relay on the outdoor board has failedE409Outdoor control secondary voltage is 18VAC or less; after 10 minutes operation…E410The outdoor unit low pressure switch has opened indicating unit pressure is…E411The low pressure switch has opened 5 times within one hour; outdoor unit is…E412The outdoor unit high pressure switch has opened indicating unit pressure is…E413The high pressure switch has opened 5 times within one hour; outdoor unit is…E416The outdoor coil sensor has malfunctioned (open, shorted, or out of range)…E422Compressor top cap switch exceeding thermal limit.E423The inverter has detected a circuit problem (inverter code 40).E424The liquid line temperature sensor has malfunctioned (open or shorted).E425Outdoor control has increased minimum compressor speed to allow for proper oil…E426Excessive inverter alarmsE427The inverter has detected a DC peak fault condition (55A or higher), causing…E428The inverter has detected a high main input current condition (inverter code…E429DC link power in inverter does not rise above threshold (180 VDC for 2/3-ton…E430Compressor start failure (inverter code 26).E431PFC detected an over-current condition of 100A (inverter code 27), indicating…E432The inverter has detected a DC link high voltage conditionE433The inverter has detected a compressor over-current conditionE434Outdoor control has lost communications with the inverter for greater than 3…E435Inverter internal error (inverter code 60).E436Inverter heat sink temperature exceeded limit (inverter code 62).E437Heat sink temperature sensor fault
View all 38 error codes
E438The inverter has detected a PFC over-current condition caused by high load…E439Compressor slowdown due to high input currentE440Heat sink temperature is approaching limit; compressor speed automatically…E441Compressor slowdown due to high compressor currentE442The top cap switch has opened five times within one hour; outdoor unit is…E443Incorrect appliance unit size code selected.E600Compressor has been cycled OFF on utility load shedding.E601Outdoor unit has been cycled OFF on low temperature protection

Service modes (6)

  • Diagnostic Mode["Ensure outdoor control is in IDLE mode (no heating or cooling demand).","Push and hold the button…
  • Display Configuration Mode (Enable Coil/Liquid Line Temperature Display)["Control can be in Idle or demand mode.","Push and hold button until solid dash (-) appears…
  • Error Code Recall Mode["Ensure outdoor control is in IDLE mode.","Push and hold button next to 7-segment display until…
  • Outdoor Fan Test Mode["Ensure outdoor control is in IDLE mode.","Push and hold button next to 7-segment display until…
  • Pump Down Mode["Turn room thermostat OFF.","Install refrigerant gauges on the system to monitor pressure.","Move…
  • Unit Selection Code Programming["Ensure outdoor control is in IDLE mode (no heating or cooling demand).","Push and hold button…

Full entry steps, exit procedures, and test sequences are available in Max.

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