Cooling Fan Moderate Moderate DIY

Frigidaire Microwave 'Cooling Fan' / Fan-runs-after-cooking — Vent fan stuck on

Frigidaire Microwave · Error code Cooling Fan

What Cooling Fan Means

Many over-the-range Frigidaire microwaves run the vent/cooling fan automatically when the cabinet gets hot (typically above ~158°F / 70°C). If it runs constantly or will not shut off, the thermal sensor or control is calling for cooling indefinitely.

Symptoms

  • Vent fan runs nonstop, even when microwave is off
  • Fan kicks on minutes after a cycle
  • Cannot turn fan off from Vent Fan button

Common Causes

1
Heat from cooktop below triggering auto-cool

Normal behavior on OTR units — fan runs until cabinet cools.

2
Stuck-closed thermal sensor

Sensor reads hot even after cabinet cools.

3
Failed control board

Board commands fan on continuously.

How to Fix It

  1. Stop using the cooktop and wait 15–30 minutes — if fan stops, it was normal auto-cool.
  2. If it never stops, unplug for 5 minutes and re-test.
  3. Test the thermal cutout / thermistor on top of the microwave per the tech sheet (should open at room temp on cutout types, or read normal resistance on thermistor types).
  4. Replace the thermal sensor if it does not open / reads shorted.
  5. If sensor is good, replace the control board.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement Frigidaire microwave thermal cut-off / thermostat View on Amazon→ Common replacement Frigidaire microwave thermistor View on Amazon→

More Frigidaire Microwave Codes

Child Lock 'Lock' / 'L' — Child lock engaged Demo 'Demo' / 'd' — Showroom demo mode on door 'door' message — Door not fully closed F1 F1 — Control board / thermistor open F10 F10 — Analog-to-digital / keypad communication error F2 F2 — Shorted thermistor / over-temp sensor

All Frigidaire codes → All microwave codes →

Verified against manufacturer documentation: frigidaire.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.