Hamilton Beach
Cooling Fan or Control Logic Issue
Microwave fan runs loudly or continuously even when not cooking (beyond normal cool-down period).
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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
Stuck fan relay on control board, Overheating detected by thermostat, Shorted fan motor, Control board firmware fault
How to Fix / Troubleshooting
Safety: Unplug the microwave before inspection.
Steps:
- Allow the microwave to cool for 20–30 minutes. Some models run the fan briefly after cooking; continuous operation beyond this is abnormal.
- Plug back in and observe if the fan starts immediately without any command.
- If so, the fan relay on the control board may be stuck closed or the thermostat may be signaling overheat.
Internal (qualified DIYers):
- Inspect the cooling fan motor and wiring for shorts.
- Check thermostats for proper operation.
- If the fan is powered whenever the unit is plugged in, replace the electronic control board.
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Repair Difficulty
Hard
4/5
Required Part
Cooling Fan Motor
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