E07
Wolf
Open or Shorted Supply Air Temperature Sensor
Furnace control shows E07; blower may run continuously without heat.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed supply air temperature sensor (supply thermistor), Damaged sensor wiring harness, Loose connector at Wolf control board, Overheated sensor due to airflow issues
How to Fix / Troubleshooting
Safety: Disconnect power before accessing internal wiring.
- Locate sensor: The supply air temperature sensor is typically mounted in the supply plenum or on the furnace outlet panel, wired back to the Wolf control board.
- Inspect wiring: Check the sensor harness for cuts, abrasions, or melted insulation. Ensure the plug is fully seated on the control board.
- Check resistance: With power off, disconnect the sensor and measure its resistance with a multimeter. Compare to Wolf's temperature/resistance chart (from the service manual). If the reading is open, shorted, or far out of range, replace the sensor.
- Airflow check: Confirm the filter is clean and registers are open. Chronic overheating can damage sensors.
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Repair Difficulty
Medium
3/5
Required Part
Wolf Supply Air Temperature Sensor
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