F2 Serious Moderate DIY

Frigidaire Microwave F2 — Shorted thermistor / over-temp sensor

Frigidaire Microwave · Error code F2

What F2 Means

F2 means the control sees the cavity (or magnetron) temperature sensor reading short-circuit or out-of-range high. It can also indicate a true over-temperature condition.

Symptoms

  • F2 on display
  • Cooking stops mid-cycle
  • Cavity feels unusually hot before fault
  • Cooling fan may run continuously

Common Causes

1
Shorted thermistor

Sensor element or its wiring is shorted to chassis.

2
Actual high-temp event

Blocked vent, failed cooling fan, or cooking empty triggered a real over-temp.

3
Pinched / chafed sensor harness

Insulation worn through against a sharp edge.

4
Control board fault

Board misreads a good sensor.

How to Fix It

  1. Unplug and let the microwave cool for 30 minutes.
  2. Verify vents (top, rear) are not blocked and the cooling fan spins freely.
  3. Disconnect the thermistor and measure resistance at room temp; compare to tech-sheet spec.
  4. Inspect the sensor harness for pinch points or melted insulation.
  5. Replace the thermistor if shorted; repair harness if damaged.
  6. If sensor and harness check 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 thermistor View on Amazon→ Common replacement Frigidaire microwave cooling fan motor View on Amazon→

More Frigidaire Microwave Codes

Child Lock 'Lock' / 'L' — Child lock engaged Cooling Fan 'Cooling Fan' / Fan-runs-after-cooking — Vent fan stuck on 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

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.