OK
Stuck Cooling Fan Relay or Overheat Condition
Microwave fan runs continuously even when not cooking
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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 PCB, Faulty temperature sensor reading high, Control PCB logic fault, Shorted fan wiring
How to Fix / Troubleshooting
Safety: Unplug the microwave before internal inspection.
- 1. Allow cooling: If the fan stops after several minutes, it may be normal post-cook cooling.
- 2. If fan never stops: Unplug for 10 minutes, then reconnect. If the fan starts immediately without any command, the relay is likely stuck.
- 3. Inspect control PCB: Look for burnt or discolored areas around the fan relay.
- 4. Replace control PCB if relay is stuck or driver is faulty.
- 5. Check fan wiring for shorts to live that could bypass the relay.
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Repair Difficulty
Medium
3/5
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