E13
Wolf
Return Air Temperature Sensor Fault
Furnace displays E13; unit may shut down unexpectedly during operation.
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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 return air thermistor, Loose or corroded sensor connector, Damaged sensor wiring harness, Control board sensor input failure
How to Fix / Troubleshooting
Safety: Disconnect power before handling sensors or wiring.
- Locate sensor: The return air temperature sensor is typically mounted near the return air opening or inside the blower compartment on Wolf furnaces.
- Inspect and reseat: Check the sensor body for physical damage. Unplug and replug the connector to clean contacts.
- Resistance check: Measure sensor resistance and compare to Wolf's temperature/resistance chart. Replace the sensor if readings are out of range.
- Board input: If a known-good sensor still results in E13, the control board's sensor input circuit may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Wolf Return Air Temperature Sensor
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