Wolf Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Furnace will not start; control shows E01 shortly after a call for heat.
No Flame Detected on Ignition
E02
Furnace starts ignition sequence but shuts down after a few seconds with E02 displayed.
Flame Loss During Run
E03
Furnace does not ignite; inducer motor does not start and E03 is shown.
Inducer Motor Failure or Pressure Switch Not Proving
E04
Furnace attempts to start but shuts down with E04; blower may run briefly.
High Limit Switch Open (Overheat Condition)
E05
Furnace shuts down and displays E05 after running for a short period; blower may continue to run.
Rollout Switch Tripped (Flame Rollout Detected)
E06
Furnace does not respond to thermostat; E06 displayed on control board or interface.
Thermostat or Low-Voltage Communication Fault
E07
Furnace control shows E07; blower may run continuously without heat.
Open or Shorted Supply Air Temperature Sensor
E08
Furnace displays E08 and will not complete ignition; inducer may start and stop.
Pressure Switch Stuck Open
E09
Furnace displays E09; inducer runs continuously without ignition.
Pressure Switch Stuck Closed
E10
Furnace shows E10; blower may not start or may run erratically.
Blower Motor Fault or ECM Communication Error
E11
Furnace displays E11; no ignition; gas valve does not open.
Gas Valve Circuit Fault
E12
Furnace shows E12 and will not start; 24V control power may be absent.
Low-Voltage Power Fault (24V Transformer/Control Fuse)
E13
Furnace displays E13; unit may shut down unexpectedly during operation.
Return Air Temperature Sensor Fault
E14
Furnace shows E14; ignition sequence may not start or may abort.
Ignition Lockout (Exceeded Retry Limit)
E15
Furnace displays E15; unit may not respond to thermostat or may behave erratically.
Internal Control Board Fault
E16
Furnace shows E16; unit may shut down on very cold or very warm return air conditions.
Supply/Return Temperature Differential Out of Range
E17
Furnace displays E17; unit may not start or may shut down unexpectedly.
Flame Sensor Short to Ground
E18
Furnace shows E18; inducer and blower may run but no ignition occurs.
Igniter Circuit Fault
E19
Furnace displays E19; unit may lock out after a brief attempt to start.
Incorrect Line Voltage or Polarity
E20
Furnace shows E20; condensate pump may be running or unit may shut down during wet conditions.
Condensate Drain Fault (Condensing Models)
Symptom
Furnace blower runs but burners do not light; no error code displayed.
No Heat with Blower Only
Symptom
Furnace blower starts and stops repeatedly without burner ignition.
Fan-Only Cycling Without Heat
Symptom
Furnace causes noticeable vibration throughout the house when running.
Excessive Vibration
Symptom
Furnace cycles on and off frequently, running for only a few minutes at a time.
Short Cycling
Symptom
Furnace frequently trips the household circuit breaker.
Overcurrent/Short Circuit
Symptom
Furnace ignites but produces yellow, lazy flames instead of sharp blue flames.
Improper Combustion/Yellow Flame
Symptom
Furnace is completely dead; no lights, no blower, no response to thermostat.
No Power to Furnace
Symptom
Furnace is very noisy during operation; rattling, squealing, or grinding sounds are heard.
Mechanical Noise/Vibration
Symptom
Furnace makes loud booming or delayed ignition noise when burners light.
Delayed Ignition
Symptom
Furnace produces a strong burning or electrical smell when operating.
Overheating Components or Electrical Overload
Symptom
Furnace runs but produces insufficient heat; home never reaches set temperature.
Underfiring or Low Heat Output
Symptom
Furnace runs continuously and will not shut off even when thermostat is satisfied.
Continuous Operation/Runaway Heat or Fan
Symptom
Furnace shuts down during very cold weather and may restart after some time.
Intake/Exhaust Icing or Extreme Condition Shutdown
Symptom
Furnace starts but shuts down shortly after ignition; thermostat still calling for heat.
Safety Device Interruption
Symptom
Thermostat display is blank and furnace does not respond.
Loss of 24V Control Power to Thermostat
Symptom
Visible rust, soot, or discoloration around burner compartment or vent connection.
Combustion Quality/Heat Exchanger Concern
Symptom
Water is leaking around the base of the furnace or from internal panels.
Water/Condensate Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Furnace will not start; control shows E01 shortly after a call for heat.
|
No Flame Detected on Ignition | View Details |
| E02 |
Furnace starts ignition sequence but shuts down after a few seconds with E02 displayed.
|
Flame Loss During Run | View Details |
| E03 |
Furnace does not ignite; inducer motor does not start and E03 is shown.
|
Inducer Motor Failure or Pressure Switch Not Proving | View Details |
| E04 |
Furnace attempts to start but shuts down with E04; blower may run briefly.
|
High Limit Switch Open (Overheat Condition) | View Details |
| E05 |
Furnace shuts down and displays E05 after running for a short period; blower may continue to run.
|
Rollout Switch Tripped (Flame Rollout Detected) | View Details |
| E06 |
Furnace does not respond to thermostat; E06 displayed on control board or interface.
|
Thermostat or Low-Voltage Communication Fault | View Details |
| E07 |
Furnace control shows E07; blower may run continuously without heat.
|
Open or Shorted Supply Air Temperature Sensor | View Details |
| E08 |
Furnace displays E08 and will not complete ignition; inducer may start and stop.
|
Pressure Switch Stuck Open | View Details |
| E09 |
Furnace displays E09; inducer runs continuously without ignition.
|
Pressure Switch Stuck Closed | View Details |
| E10 |
Furnace shows E10; blower may not start or may run erratically.
|
Blower Motor Fault or ECM Communication Error | View Details |
| E11 |
Furnace displays E11; no ignition; gas valve does not open.
|
Gas Valve Circuit Fault | View Details |
| E12 |
Furnace shows E12 and will not start; 24V control power may be absent.
|
Low-Voltage Power Fault (24V Transformer/Control Fuse) | View Details |
| E13 |
Furnace displays E13; unit may shut down unexpectedly during operation.
|
Return Air Temperature Sensor Fault | View Details |
| E14 |
Furnace shows E14; ignition sequence may not start or may abort.
|
Ignition Lockout (Exceeded Retry Limit) | View Details |
| E15 |
Furnace displays E15; unit may not respond to thermostat or may behave erratically.
|
Internal Control Board Fault | View Details |
| E16 |
Furnace shows E16; unit may shut down on very cold or very warm return air conditions.
|
Supply/Return Temperature Differential Out of Range | View Details |
| E17 |
Furnace displays E17; unit may not start or may shut down unexpectedly.
|
Flame Sensor Short to Ground | View Details |
| E18 |
Furnace shows E18; inducer and blower may run but no ignition occurs.
|
Igniter Circuit Fault | View Details |
| E19 |
Furnace displays E19; unit may lock out after a brief attempt to start.
|
Incorrect Line Voltage or Polarity | View Details |
| E20 |
Furnace shows E20; condensate pump may be running or unit may shut down during wet conditions.
|
Condensate Drain Fault (Condensing Models) | View Details |
| – |
Furnace blower runs but burners do not light; no error code displayed.
|
No Heat with Blower Only | View Details |
| – |
Furnace blower starts and stops repeatedly without burner ignition.
|
Fan-Only Cycling Without Heat | View Details |
| – |
Furnace causes noticeable vibration throughout the house when running.
|
Excessive Vibration | View Details |
| – |
Furnace cycles on and off frequently, running for only a few minutes at a time.
|
Short Cycling | View Details |
| – |
Furnace frequently trips the household circuit breaker.
|
Overcurrent/Short Circuit | View Details |
| – |
Furnace ignites but produces yellow, lazy flames instead of sharp blue flames.
|
Improper Combustion/Yellow Flame | View Details |
| – |
Furnace is completely dead; no lights, no blower, no response to thermostat.
|
No Power to Furnace | View Details |
| – |
Furnace is very noisy during operation; rattling, squealing, or grinding sounds are heard.
|
Mechanical Noise/Vibration | View Details |
| – |
Furnace makes loud booming or delayed ignition noise when burners light.
|
Delayed Ignition | View Details |
| – |
Furnace produces a strong burning or electrical smell when operating.
|
Overheating Components or Electrical Overload | View Details |
| – |
Furnace runs but produces insufficient heat; home never reaches set temperature.
|
Underfiring or Low Heat Output | View Details |
| – |
Furnace runs continuously and will not shut off even when thermostat is satisfied.
|
Continuous Operation/Runaway Heat or Fan | View Details |
| – |
Furnace shuts down during very cold weather and may restart after some time.
|
Intake/Exhaust Icing or Extreme Condition Shutdown | View Details |
| – |
Furnace starts but shuts down shortly after ignition; thermostat still calling for heat.
|
Safety Device Interruption | View Details |
| – |
Thermostat display is blank and furnace does not respond.
|
Loss of 24V Control Power to Thermostat | View Details |
| – |
Visible rust, soot, or discoloration around burner compartment or vent connection.
|
Combustion Quality/Heat Exchanger Concern | View Details |
| – |
Water is leaking around the base of the furnace or from internal panels.
|
Water/Condensate Leak | View Details |
No matching codes found
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