MasterChef
Ventilation Fan Control Failure (OTR Models)
Microwave over-the-range vent fan does not run or runs only at one speed.
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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 vent fan motor, Faulty fan speed switch or relay, Grease-clogged fan blades, Loose wiring to fan
How to Fix / Troubleshooting
Safety first: Unplug the microwave or switch off the circuit breaker before servicing the fan.
Steps:
- 1. Check fan settings: Try all fan speed settings from the control panel. Note which speeds work.
- 2. Clean filters: Remove and clean the grease filters under the microwave. Clogged filters can strain the fan.
- 3. Inspect fan (experienced DIYers): Remove the top grille and access the vent fan motor. Check for grease buildup on blades and clean carefully.
- 4. Test motor: If the motor hums but does not spin, or only runs on one speed, the motor or speed control circuit may be failing and should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Vent Fan Motor
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