KitchenAid Oven Error Code F4

F4 means the control board detected an open circuit in the oven temperature sensor. The sensor is not sending any resistance signal to the board, which prevents the oven from reading its internal temperature. The most common causes are a failed sensor, a loose wiring connection, or damaged wiring between the sensor and the board.

No. When F4 is active, the oven cannot monitor its internal temperature, which means the control board cannot regulate the heating elements. Operating the oven in this state creates a risk of significant overheating. Do not use the oven until the sensor or wiring issue is resolved.

Unplug the oven before testing. Remove the two screws securing the sensor probe inside the oven cavity, pull it forward slightly, and disconnect the wiring harness connector. Set your multimeter to the ohms setting and probe the two terminals on the sensor connector. At room temperature (70°F), a good sensor reads approximately 1080 ohms. The resistance should increase steadily as temperature rises, adding roughly 2 ohms per degree Fahrenheit above 70°F. A reading of infinite resistance or no continuity confirms the sensor is open and needs replacement.

Start by unplugging the oven and locating the temperature sensor probe mounted on the back wall inside the oven cavity. Disconnect the sensor and use a multimeter to measure its resistance. At 70°F, you should read approximately 1080 ohms, increasing by about 2 ohms for each degree above 70°F. If you read infinite resistance or no continuity, replace the sensor. If the sensor measures correctly, check the wiring harness connector at both the sensor end and at the control board for looseness or corrosion.

A replacement oven temperature sensor typically costs between $20 and $60 for the part, depending on your specific model. If you replace it yourself, that is your total cost and the repair usually takes under 30 minutes. A professional repair technician will add a service call fee plus labor, bringing the total to roughly $100 to $200 in most markets. If the control board turns out to be the cause, board replacement costs significantly more, often $150 to $350 for the part alone.