Thermador
Stuck Cooling Fan Relay or Temperature Sensor Error
Oven cooling fan runs continuously even when the oven is off and cool.
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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
Relay on control board stuck closed, Shorted temperature sensor reading high, Control board logic fault
How to Fix / Troubleshooting
Safety first: Disconnect power at the breaker before accessing the control area.
- Allow full cool-down: Ensure the oven has been off for several hours. Some models keep the fan running until the cavity is cool.
- Power reset: Turn off power for 10 minutes, then restore. If the fan immediately starts again with a cold oven, suspect a control issue.
- Sensor test (advanced): Test the oven temperature sensor resistance at room temperature. A low reading may cause the control to think the oven is hot.
If the sensor is normal, the cooling fan relay on the control board may be stuck and the board will likely need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Electronic Oven Control Board
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