Lennox SLP99UHV Error Codes

Equipment type not specified · Ducted Heating

• -- Soft disable - Soft disabling is when thermostat finds a device on the BUS that it does…
• . Idle mode (Decimal blinks at 1 Hertz -- 0.5 second ON, 0.5 second OFF).
• A Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second OFF) / cfm…
• C Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting…
• E105 Device communication problem - No other devices on BUS (Communication system).
• E110 Low line voltage.
• E113 High line voltage.
• E114 Line voltage frequency out-of-range.
• E115 Low 24V - Control will restart if the error recovers.
• E120 Unresponsive device.
• E124 Active communicating thermostat signal missing for more than 3 minutes.
• E125 Control failed self-check, internal error, failed hardware. Will restart if error…
• E126 Failed internal control communication between microcontrollers.
• E180 Outdoor air sensor failure - NO error if disconnected. Only shown if shorted or…
• E200 Hard lockout - Rollout circuit open or previously open.
• E201 Indoor blower communication failure - Unable to communicate with blower motor.
• E202 Indoor blower motor mis-match - Indoor motor horsepower does not match unit capacity.
• E203 Appliance capacity / size is NOT programmed. Invalid unit codes refer to configuration…
• E204 Gas valve mis-wired.
• E205 Gas valve control relay contact shorted.
• E207 Hot surface ignitor sensed open - Refer to troubleshooting in installation instruction.
• E223 Low pressure switch failed open - Refer to troubleshooting in installation instruction.
• E224 Low pressure switch failed closed - Refer to troubleshooting in installation instruction.
• E225 High pressure switch failed open - Refer to troubleshooting in installation instruction.
• E226 High pressure switch failed closed - Refer to troubleshooting in installation instruction.
• E227 Low pressure switch open during trial for ignition or run mode. Refer to troubleshooting…
• E228 Unable to perform successful pressure switch calibration.
• E240 Low flame current - Run mode - Refer to troubleshooting in installation instruction.
• E241 Flame sensed out of sequence - Flame still present.
• E250 Limit switch circuit open - Refer to troubleshooting in installation instruction.
• E252 Discharge air temperature too high (gas heat only).
• E270 Soft lockout - Exceeded maximum number of retries. No flame current sensed.
• E271 Soft lockout - Exceeded maximum number of retries. Last retry failed due to the pressure…
• E272 Soft lockout - Exceeded maximum number of recycles. Last recycle due to the pressure…
• E273 Soft lockout - Exceeded maximum number of recycles. Last recycle due to flame failure.
• E274 Soft lockout - Exceeded maximum number of recycles. Last recycle failed due to the limit…
• E275 Soft lockout - Flame sensed out of sequence from code 241 fault. Flame signal is gone.
• E276 Soft lockout - Exceeded maximum number of calibration retries.
• E290 Ignitor circuit fault - Failed ignitor or triggering circuitry.
• E291 Restricted air flow - Cubic feet per minute is lower than what is needed for minimum…
• E292 Indoor blower motor unable to start - Seized bearings, stuck wheel, etc.
• E294 Combustion air inducer motor amp draw is too high.
• E295 Indoor blower motor temperature is too high.
• E310 Discharge error sensor failure - No error if disconnected. Only shown if shorted or…
• E311 Heat rate reduced to match indoor blower air flow. Replace filter or repair duct…
• E312 Restricted air flow in cooling or continuous fan mode is lower than cfm setting.
• E313 Indoor or outdoor unit capacity mismatch.
• E331 Global network connection - Communication link problem.
• E347 No 24 Volt output on Y1 to C with non-communicating outdoor unit.
• E348 No 24 Volt output on Y2 to C with noncommunicating outdoor unit.
• E349 No 24 Volts between R & O with non-communicating outdoor unit (Dual fuel module required…
• E401 LSOM - Compressor ran more than 18 hours in air conditioning mode.
• E402 LSOM - Outdoor unit system pressure trip.
• E403 LSOM - Compressor short-cycling (Running less than 4 minutes).
• E404 LSOM - Compressor rotor locked.
• E405 LSOM - Compressor open circuit.
• E406 LSOM - Compressor open start circuit.
• E407 LSOM - Compressor open run circuit.
• E408 LSOM - Compressor contactor is welded.
• E409 LSOM - Compressor contactor is welded.
• H Heat Stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting…
• U Discharge Air Temperature
• d Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting…
• df Defrost mode.
• h Variable Capacity Heat (1 second ON, 0.5 second OFF) / % of input rate displayed / Pause/…

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