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Back to Lennox SLP99DF110XV60C*

Lennox SLP99DF110XV60C* troubleshooting and error codes

These codes are matched from manufacturer documentation to this model's series or control platform. Keep checks visible and safe; do not open electrical, refrigerant, gas, combustion, or sealed equipment compartments.

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Source-backed code set

56 matched codes

CodeMeaningSystem areaPriority
E105Device communication problem; no other devices on the busSystem controlService
E110Low line voltageSystem controlService
E113High line voltageSystem controlService
E114Line-voltage frequency out of rangeSystem controlService
E115Low 24-volt control voltageSystem controlService
E120Unresponsive deviceSystem controlService
E124Communicating thermostat signal missing for more than three minutesSystem controlService
E125Control self-check or internal hardware failureSystem controlService
E126Internal communication failure between control microcontrollersSystem controlService
E180Outdoor-air sensor shorted or out of rangeSystem controlService
E200Hard lockout from an open or previously open rollout circuitSystem controlUrgent
E201Indoor blower communication failureSystem controlService
E202Indoor blower motor horsepower does not match unit capacitySystem controlService
E203Appliance capacity or size is not programmedSystem controlService
E204Gas valve miswiredSystem controlService
E205Gas-valve control relay contact shortedSystem controlUrgent
E207Hot-surface ignitor sensed openSystem controlUrgent
E223Low-pressure switch failed openSystem controlService
E224Low-pressure switch failed closedSystem controlService
E225High-pressure switch failed openSystem controlService
E226High-pressure switch failed closedSystem controlService
E227Low-pressure switch open during ignition trial or run modeSystem controlService
E228Pressure-switch calibration unsuccessfulSystem controlService
E240Low flame current during run modeSystem controlUrgent
E241Flame sensed out of sequenceSystem controlUrgent
E250Limit-switch circuit openSystem controlUrgent
E252Discharge-air temperature too high during gas heatSystem controlUrgent
E270Soft lockout after maximum ignition retries with no flame currentSystem controlUrgent
E271Soft lockout after retries ending with pressure switch openSystem controlService
E272Soft lockout after recycles ending with pressure switch openSystem controlService
E273Soft lockout after recycles caused by flame failureSystem controlUrgent
E274Soft lockout after limit-circuit opening or extended open limitSystem controlUrgent
E275Soft lockout following out-of-sequence flame faultSystem controlUrgent
E276Soft lockout after maximum calibration retriesSystem controlService
E290Ignitor circuit faultSystem controlUrgent
E291Restricted airflow below the minimum firing-rate requirementSystem controlService
E292Indoor blower motor unable to startSystem controlService
E294Combustion-air inducer motor current too highSystem controlService
E295Indoor blower motor temperature too highSystem controlService
E310Discharge-air temperature sensor shorted or out of rangeSystem controlService
E311Heat rate reduced to match restricted indoor-blower airflowSystem controlService
E312Restricted airflow in cooling or continuous-fan modeSystem controlService
E313Indoor and outdoor unit capacity mismatchSystem controlService
E331Global network communication-link problemSystem controlService
E347No 24-volt Y1 output to C with a noncommunicating outdoor unitSystem controlService
E348No 24-volt Y2 output to C with a noncommunicating outdoor unitSystem controlService
E349No 24 volts between R and O with a noncommunicating outdoor unitSystem controlService
E401Compressor ran more than 18 hours in air-conditioning modeSystem controlUrgent
E402Outdoor-unit system pressure tripSystem controlUrgent
E403Compressor short cyclingSystem controlService
E404Compressor rotor lockedSystem controlUrgent
E405Compressor open circuitSystem controlUrgent
E406Compressor open start circuitSystem controlUrgent
E407Compressor open run circuitSystem controlUrgent
E408Compressor contactor weldedSystem controlUrgent
E409Compressor contactor weldedSystem controlUrgent