Frigidaire Range Error Code F100

F100 on a Frigidaire range means the NTC temperature sensor on the magnetron housing has detected a temperature above the allowed limit. The magnetron is the component that generates microwave energy, and this code is a thermal protection response. The appliance stops microwave operation to prevent damage to the magnetron. The cause can be genuine overheating or a defective temperature sensor.

You should not continue using the microwave function while F100 is active. The error indicates a thermal protection limit has been reached, and continuing to operate the unit could cause permanent damage to the magnetron or create a fire hazard. The stovetop or oven sections of the range are separate systems and may still be safe to use, but the microwave should remain off until the issue is resolved.

Repair costs depend on which component has failed. Replacing an NTC thermistor sensor is typically the least expensive fix, with parts generally ranging from around $15 to $50 and labor costs varying by region. A cooling fan replacement may run $40 to $100 for parts. Magnetron replacement is the most costly repair, with parts alone potentially ranging from $100 to $300 or more, plus labor. Getting a diagnostic visit from a technician will help clarify exactly what needs to be replaced.

Some causes of F100 can be addressed without professional help, such as clearing blocked vents or allowing the unit to fully cool down after heavy use. However, testing and replacing the NTC sensor, cooling fan, or magnetron involves working near high-voltage components and requires proper knowledge and safety precautions. If basic cooling and ventilation checks do not resolve the error, a qualified technician should perform further diagnosis.

Turning off the microwave and allowing it to cool down is the recommended first step and may clear F100 if the unit simply overheated during extended use. However, if the underlying cause is a faulty NTC sensor, a failed cooling fan, or a deteriorating magnetron, the error will return once operation resumes. A reset addresses the symptom but not a component failure.