KitchenAid Microwave Error Code F3-E0

F3-E0 means the control board has detected an open circuit in the temperature sensor. The sensor communicates with the board through a resistance signal, and when the board receives no valid reading, it triggers this code and stops the microwave from operating. The sensor should read approximately 1080 ohms at 70°F, increasing by 2 ohms per degree Fahrenheit.

No. The F3-E0 code indicates the microwave has lost its ability to monitor internal temperature. Running the appliance without a functioning temperature sensor removes a key safety protection against overheating. The microwave will typically refuse to operate while this code is active, and you should not attempt to bypass it. Resolve the sensor or wiring issue before using the microwave again.

Unplug the microwave, locate the temperature sensor, and disconnect its wiring connector. Set a multimeter to measure resistance (ohms) and place the probes across the sensor terminals. At room temperature around 70°F, a good sensor reads approximately 1080 ohms. For every degree above 70°F, expect the reading to increase by about 2 ohms. A reading of infinite resistance (open line) or one far outside this range confirms the sensor has failed and needs replacement.

Start by unplugging the microwave and checking the wiring connector at the temperature sensor. Reconnect or reseat it if it is loose. Next, measure the sensor's resistance with a multimeter: a good sensor reads around 1080 ohms at 70°F. If the reading is open or clearly out of range, replace the temperature sensor. If both the sensor and connections check out, the control board may have a welded relay and will need to be replaced.

If only the temperature sensor needs replacement, the part typically costs between $20 and $60 depending on the model, and it is a manageable DIY repair for someone comfortable with appliance disassembly and a multimeter. If the control board has a welded relay and needs replacement, the part alone can range from $80 to $200 or more, making professional diagnosis worthwhile before purchasing the board.