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Error code reference

GE Range Error Code F100

Magnetron case sensor temperature over-temp limit (NTC sensor on the magnetron detects temperature above the limit).

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What the F100 error code actually means

Your GE range's microwave section has detected that a heat-sensitive component called the magnetron has gotten too hot and shut itself down for safety. This is similar to a circuit breaker tripping to prevent damage. Letting the unit cool down completely and ensuring the vents are clear are the first steps before attempting to use it again.

Diagnostic procedure

The full F100 procedure

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1
First diagnostic step
Turn off the microwave and wait for the temperature to cool down.
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Most common causes of F100

Ranked by how often they cause this code
  1. 1Blocked or restricted ventilation
  2. 2Cooling fan failure
  3. 3Extended or high-power cooking cycles
  4. 4Faulty NTC temperature sensor
  5. 5Magnetron failure or degradation

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Questions people ask about F100

What does F100 mean on a GE range?
F100 on a GE range means the NTC temperature sensor mounted on the magnetron case has detected a temperature above the allowable limit. The control board triggers this code as a protective measure to shut down microwave operation before damage occurs. It points to a problem with overheating in the magnetron section, which can stem from ventilation issues, a faulty cooling fan, a defective sensor, or the magnetron itself.
Is it safe to keep using my GE range when F100 is displayed?
No, you should not continue using the microwave function while F100 is active. The code indicates the magnetron section has overheated, and continued operation could damage the magnetron, surrounding components, or in extreme cases pose a fire risk. Turn the unit off and allow it to cool down fully before investigating further.
How much does it cost to repair an F100 error on a GE range?
Repair costs depend on which component is at fault. Replacing an NTC temperature sensor is typically a lower-cost repair, generally in the range of $50 to $150 for parts and labor. A cooling fan replacement may fall in the $75 to $200 range. Magnetron replacement is the most expensive possibility, often ranging from $150 to $400 or more depending on the model and labor rates in your area.
Can I fix the F100 error myself, or do I need a technician?
Some causes of F100, such as blocked vents or running the unit too long, can be resolved without professional help by clearing obstructions and allowing the unit to cool completely. However, diagnosing a faulty NTC sensor, a failed cooling fan, or a degraded magnetron requires basic electrical testing skills and comfort working near high-voltage components. If you are not experienced with appliance repair, a qualified technician is the safer choice for any steps beyond cleaning and cooling.
Will resetting the range clear the F100 error code?
Powering the unit off and allowing it to cool may allow the error to clear if the fault was caused by a temporary over-temperature event such as a long cooking cycle or momentarily blocked venting. However, if the underlying cause, such as a faulty cooling fan or defective NTC sensor, is still present, the F100 code will return during the next use. A reset alone is not a repair.

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