KitchenAid Oven Error Code F5

F5 signals that the control board detected either a shorted temperature sensor circuit or an oven temperature that exceeded safe limits due to a runaway condition. The two most common hardware causes are a failed RTD temperature sensor and relay contacts on the oven control board that have welded themselves closed, leaving the heating element unable to shut off.

Start by disconnecting power, then check the wiring harness from the temperature sensor to the control board for any visible damage or loose connectors. With a multimeter set to ohms, measure resistance across the sensor terminals; a healthy sensor reads around 1080 ohms at room temperature. If the sensor and connections check out, the fault is likely welded relay contacts on the control board, which requires board replacement. The sensor swap is a beginner-level repair; board replacement is moderate difficulty and warrants a technician if you are not comfortable working with oven wiring.

Disconnect power to the oven, then locate the temperature sensor probe inside the oven cavity, usually mounted to the rear wall with one or two screws. Disconnect the sensor's wiring harness connector and use a multimeter set to resistance (ohms) to measure across the two sensor terminals. At room temperature, a good sensor reads approximately 1080 ohms. A reading near zero indicates a short and the sensor needs replacement. A reading within the normal range shifts suspicion to the wiring harness or the control board relay.

No. F5 can indicate a runaway heating condition caused by welded relay contacts, meaning the oven may be unable to stop heating on its own. Disconnect power to the appliance and do not operate it until the cause has been identified and repaired. This is one of the few oven error codes that presents a genuine fire and burn risk if ignored.

A replacement oven temperature sensor typically costs $20 to $60 for the part, and replacing it is a low-difficulty DIY repair taking under 30 minutes. If the cause is welded relay contacts, a replacement oven control board usually runs $150 to $350 for the part alone. Adding professional labor for a board replacement generally brings the total to $300 to $550 or more depending on your market and service provider.