Whirlpool Microwave Error Code FCE2

FCE2 indicates a failure in the exhaust air temperature detection circuit, caused by a problem with the HF NTC thermistor. This thermistor monitors the temperature of air passing through the microwave's exhaust system and reports that data to the Appliance Control Unit. When the ACU receives a signal outside the expected resistance range, it logs FCE2 and may disable operation. The fault can stem from a bad thermistor, damaged wiring, or a faulty connector.

It is not recommended to continue using the microwave while FCE2 is active. The exhaust air thermistor is part of the thermal protection system, and without reliable temperature monitoring, the microwave cannot properly detect overheating in the exhaust path. Operating the unit with this fault present could allow unsafe temperature conditions to go undetected.

Repair costs depend on which component has failed. A replacement HF NTC thermistor is typically an inexpensive part, often in the range of $10 to $40. If the ACU needs replacement, part costs alone can range from $80 to $200 or more. Adding professional labor, total repair costs generally fall between $100 and $350 depending on the scope of the repair and your location.

A knowledgeable DIYer can diagnose FCE2 by unplugging the microwave, disconnecting the HF NTC thermistor cable from the ACU, and measuring resistance between the connector pins with a multimeter. A correct reading at room temperature falls between 9.5 k and 10.5 k ohms. If the reading is outside that range, the thermistor needs replacement. Wiring and connector issues can also be addressed without professional help, but ACU replacement is a more complex repair.

Unplugging the microwave may temporarily clear the FCE2 code, but if the underlying component failure is still present, the code will return once the unit is powered and operated again. A permanent fix requires identifying and correcting the root cause, whether that is a failed thermistor, damaged wiring, or a bad connector. Resetting without repair is not a lasting solution.