OBH Nordica
Cooling Fan Overrun / Control Logic Issue
Microwave fan continues to run for a very long time after cooking has finished.
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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
Overheated cavity or magnetron, Stuck fan relay, Faulty temperature sensor, Control board firmware behavior
How to Fix / Troubleshooting
Safety first: It is generally safe for the fan to run after cooking, but if it runs indefinitely, unplug the unit.
- Step 1 – Allow cooling: After heavy use, it is normal for the fan to run for several minutes. Monitor whether it eventually stops.
- Step 2 – Check vents: Ensure vents are clear to allow efficient cooling; blocked vents can prolong fan operation.
- Step 3 – Sensor check: A faulty temperature sensor may falsely indicate high temperature. Inspect and, if necessary, replace the sensor.
- Step 4 – Control board: If the fan never stops until the unit is unplugged, the fan relay on the control PCB may be stuck and the board should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Cooling Fan Relay / Temperature Sensor
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