GE Microwave Error Code F1

F1 on a GE microwave indicates that the oven cavity thermistor did not detect a temperature of 165°F or higher within 20 minutes of operating an Oven, Bake, or Speedcook cycle. The appliance interprets this as an open thermistor fault and shuts down to prevent unsafe operation. The thermistor is a temperature-sensing component inside the cavity, and the fault can stem from a failed sensor, a wiring problem, or in some cases a large cold food load absorbing too much heat.

No. When F1 is triggered, the GE microwave terminates operation automatically, so continued cooking in that cycle is not possible. Attempting to repeatedly restart the unit without resolving the underlying fault is not advisable, as the code indicates the control board cannot confirm proper heating is occurring. The appliance should be diagnosed and repaired before returning to regular use.

Repair costs vary depending on the root cause. If the fix is simply reseating a connector, the cost is minimal and limited to a service call fee, typically in the range of $75 to $150. Replacing the cavity thermistor is generally an inexpensive parts repair, with parts commonly ranging from $15 to $50 plus labor. If the main PCB requires replacement, total repair costs can range from $150 to $350 or more, at which point comparing the cost to appliance replacement value is worthwhile.

Some causes of F1 are DIY-friendly, such as reseating a loose connector at CN6 on the main PCB or ruling out a false trigger by testing the unit with a smaller food load. However, replacing the cavity thermistor or diagnosing the main PCB requires comfort working with microwave internals, which store dangerously high voltage in the capacitor even when unplugged. If you are not experienced with high-voltage appliance repair, professional service is strongly recommended.

Unplugging the microwave for a few minutes and restoring power may clear the F1 display temporarily, but the code will return if the underlying cause is not corrected. If the fault is due to a genuinely failed thermistor or a wiring problem, every subsequent Oven, Bake, or Speedcook cycle will trigger F1 again within 20 minutes. A reset is useful for confirming a suspected false trigger from a large cold load but should not be treated as a repair.