KitchenAid Microwave Error Code F3T

F3T indicates a temperature sensor failure, meaning the microwave's control board has detected an oven cavity temperature outside the accepted range of 41°F (5°C) to 140°F (60°C). This can be caused by a genuinely extreme ambient temperature, a failed thermistor, damaged wiring, or in rare cases a faulty control board. The unit will not operate normally until the fault is resolved.

No, you should not continue using the microwave while F3T is active. The error indicates the temperature monitoring system is not functioning correctly, which means the unit cannot accurately regulate or safely monitor cooking conditions. Continued use without a functional temperature sensor could result in overheating or inaccurate cooking results.

Repair costs vary depending on what component has failed. A replacement thermistor is generally an inexpensive part, with the total repair cost including labor typically ranging from $75 to $175. If the main control board is at fault, parts and labor costs can range from $150 to $350 or more. Getting a diagnostic estimate before authorizing repairs is advisable, particularly on older units.

Some causes of F3T are DIY-accessible. If the microwave was in a cold or hot environment, simply moving it to a room-temperature location and waiting may clear the code. Checking and reseating wiring connectors is also manageable for experienced DIYers. However, testing and replacing the thermistor or control board involves working near high-voltage components and is best handled by a qualified technician.

A power reset, performed by unplugging the unit for one to two minutes and restoring power, may temporarily clear the code if the fault was caused by a transient condition such as a brief temperature extreme or a loose connection. However, if the underlying cause is a failed sensor or damaged wiring, the F3T code will return. A reset alone is not a repair.