Microwave High Severity
F2 Appliance Error Code

GE Microwave F2 Error: Shorted thermal sensor

This guide covers GE microwave F2 error in detail to help you diagnose and resolve the issue. What Does GE Microwave Error Code F2 Mean? Error code F2 means the control board detected a short circuit in the cavity thermal sensor. Instead of the normal resistance range (50–150 kΩ at room temperature), the sensor is […]

Quick Assessment

Answer to continue safely

Is it safe to keep using?

No. A shorted sensor sends false temperature data to the control board, making safe operation impossible. The magnetron may not run at all, or may cycle erratically. Do not use until the sensor is replaced.

Can I reset the code?

Yes. A 5-minute power disconnect clears the F2 code. If the sensor is genuinely shorted, the code returns on the next cook attempt. A successful reset that holds indicates the fault was transient (power surge or excessive heat).

When to stop immediately?

Stop if you notice: F2 returns immediately after every reset attempt, You smell burning plastic or ozone during or after operation.

Symptoms You May Notice

Microwave displays incorrect time or overheating warning

A shorted sensor sends a falsely high temperature reading, causing the unit to behave as if the cavity is dangerously hot even when cooking has not started.

F2 on display, magnetron will not activate

The display shows "F2" and all cook functions are locked. The clock and light work normally, but pressing any power-level or time pad does not start heating.

Unit shuts off seconds after starting a cook cycle

On some models, the magnetron starts briefly and then immediately cuts off as the shorted sensor reports an over-temperature condition to the control board.

Sensor-based cooking modes fail immediately

Auto-sensor cook and reheat functions (Sensor Cook, Auto Reheat) fault out at the start because they rely on accurate sensor readings that the shorted sensor cannot provide.

Possible Causes

1

Shorted thermal sensor — moisture or physical damage

Condensation inside the cavity, a grease spatter reaching the sensor body, or physical damage to the sensor tip can cause an internal short that drops the resistance to near zero.

Requires Professional
2

Pinched or shorted sensor wiring harness

The wire pair connecting the thermal sensor to the control board is pinched against a sharp metal edge, causing the two conductors to contact each other and create a short circuit.

Requires Professional
3

Control board false reading after power surge

A power surge can corrupt the sensor reading circuit on the control board, causing it to report a short even when the sensor wiring is intact.

Requires Professional

Safe Checks You Can Do

These checks are safe for homeowners. No disassembly required. Do not remove panels or access internal components.
  1. 1

    Unplug and wait 5 minutes before reset

    Unplug the microwave for 5 full minutes — longer than a standard reset — to allow any residual heat to dissipate and the control board to fully discharge. Restore power and press Clear, then test with a 30-second cook.

    If the microwave was recently used for extended cooking (large casseroles, boiling liquids), wait an additional 10 minutes before resetting to allow genuine cavity heat to clear.

  2. 2

    Clean the cavity interior before testing

    Wipe down the cavity walls, ceiling, and floor with a damp cloth to remove any grease or food splatter near the sensor port (usually a small hole or bump visible near the top of the cavity interior). Heavy grease deposits near the sensor can cause thermal bridging that mimics a short.

    Use only a mild dish-soap solution — no abrasive cleaners, which can damage the cavity coating and clog the sensor port.

  3. 3

    Confirm fault persistence before calling service

    After cleaning and resetting, run two test cycles. If F2 returns on either cycle, call for professional service. Do not continue using the microwave — never open the cabinet to inspect the sensor yourself due to the high-voltage capacitor inside.

    Tell the technician whether F2 appears immediately on power-up or only after attempting to start a cook — this helps distinguish a sensor fault from a control board fault.

When to Call a Professional

Contact a qualified technician if:

  • F2 persists after cavity cleaning and a 5-minute hard reset
  • Sensor-based cook modes fault out on every attempt — sensor reading confirmed faulty

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