Westinghouse
Ventilation / Ducting Problem
Over-the-range microwave exhaust fan does not vent properly or airflow is weak.
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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
Clogged grease filters,Blocked or incorrectly installed ductwork,Blower not oriented correctly (recirculating vs external vent),Weak or failing exhaust fan motor
How to Fix / Troubleshooting
Safety first: Unplug the microwave before removing filters or accessing the blower.
User-level steps:
- 1. Clean or replace filters: Remove metal grease filters and clean with hot soapy water, or replace charcoal filters if used.
- 2. Check vent flap: Outside, ensure the wall or roof vent flap opens freely and is not blocked.
Advanced steps:
- 3. Verify blower orientation: Some Westinghouse OTR models allow the blower to be rotated for recirculating or external venting. Confirm it is set correctly for your installation.
- 4. Inspect ducting: Check for crushed or disconnected duct sections.
- 5. Replace fan motor: If airflow remains weak and the motor is noisy or slow, replace the exhaust fan motor.
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Repair Difficulty
Medium
3/5
Required Part
Exhaust Fan Motor
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