Whirlpool Microwave: fan running continuously
What is this symptom?
If your Whirlpool microwave's fan runs continuously even after cooking, it may be due to normal cooling operations or a malfunctioning component. This issue can be caused by a faulty temperature sensor, an activated exhaust fan, or clogged vents. Understanding the reasons behind this symptom can help you address the problem effectively.
Important Tips for Whirlpool Models
- Whirlpool official docs confirm the fan running after use is normal as part of cooling.
Possible Causes
Normal post‑cooking cooling operation
How to Identify: Fan runs for a few minutes after cooking finishes and stops once internal components cool; often accompanied by turntable running or light on for a short period.
Part: Cooling fan thermal control system
Over‑range exhaust fan activated by external heat
How to Identify: Fan runs when stovetop below is used even if microwave is not cooking; shuts off after ventilated heat dissipates.
Part: Exhaust/vent fan and heat sensor
Faulty internal temperature sensor/thermostat
How to Identify: Fan runs indefinitely and unit feels cool; resetting power does not stop fan; sensor misreads temperature.
Part: Thermal sensor/thermostat
Malfunctioning control board or relay
How to Identify: Fan runs continuously regardless of temperature and after resets; other functions may behave erratically.
Part: Electronic control board and fan relay
Clogged vents or filters
How to Identify: Fan runs longer than expected, reduced airflow out of vents, and vents appear dirty or blocked.
Part: Air vents and filters
DIY Solutions
Allow normal cooling time
- Wait after cooking ends to allow the fan to run and cool the internal components.
- Observe if the fan shuts off naturally once the microwave cools down.
Clean vents and filters
- Unplug the microwave.
- Access exterior vents and grease/charcoal filters (if applicable) and remove debris.
- Use a vacuum/brush to clean vents and filters thoroughly.
- Reassemble and test the microwave.
Power reset the microwave
- Unplug the microwave from power.
- Wait 5–10 minutes to allow internal reset.
- Plug it back in and check if fan stops running.
- If available, consult manual for model‑specific power reset steps.
Next step
Choose the next step for fan running continuously
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Cooling Fan Motor
Moves cooling air around hot cooking components and electronic controls.
- Typical part-only price
- $35 - $120
- DIY difficulty
- Medium
- Estimated time
- 30-75 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Thermostat
Regulates temperature by turning the heating or cooling system on or off.
Temperature Sensor
Monitors the internal temperature to ensure correct operation and prevent overheating.
Main Control Board
The central brain of the appliance that controls all components, cycles, and timings.
Model-compatible Microwave parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Professional Repairs
Replace thermal sensor/thermostat
Control board/relay repair or replacement
Service exhaust fan mechanisms
When to Call a Professional
Preventive Maintenance
-
Clean vents and filters regularly: Extended fan running due to blocked airflow
Frequency: Every 1–3 months -
Avoid consecutive heavy cooking cycles: Excessive internal heat buildup requiring long cooling periods
Frequency: As needed
Frequently Asked Questions
Why is my Whirlpool Microwave fan running continuously?
How do I fix Whirlpool Microwave fan running continuously myself?
How much does it cost to fix fan running continuously?
When should I call a technician for fan running continuously?
References & Sources
- Whirlpool Vent Randomly Turns On Official
- Whirlpool Cooling Fan Continues to Run Official
Community Analytical Insights
Guidance from available sources; statistical claims are shown only for samples of at least 10 discussions
Common Issues Reported by Users
- Faulty thermostat causing the fan to run continuously to prevent overheating.
- Stuck relay in the control board, keeping the fan activated.
- Defective fan motor that may be shorted, leading to constant operation.
User Suggested Solutions
-
Check and replace the thermostat: Unplug the microwave, locate the thermostat (usually near the magnetron), test it with a multimeter for continuity, and replace if faulty.
-
Inspect and replace the control board: Access the control board by removing the outer casing, check for stuck relays, and replace the board if necessary.
-
Test and replace the fan motor: Disconnect power, access the fan motor, use a multimeter to check for shorts, and replace if defective.
Limited-source guidance; percentages and success-rate claims are not shown
View
Sources
Data compiled from real discussions on r/appliancerepair and r/Appliances:
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