KitchenAid Oven Error Code F4-E0

F4-E0 indicates that the lower cavity temperature sensor circuit has opened, meaning the control board is reading an infinite resistance instead of the expected sensor signal. The oven cannot safely regulate lower cavity temperature without a valid sensor reading. This fault requires diagnosing the sensor, its wiring, and connections before the oven can operate normally.

No, you should not use the oven while this fault is active. Without a valid signal from the lower cavity temperature sensor, the control board cannot accurately regulate oven temperature, which creates a risk of overheating. Discontinue use until the sensor circuit is repaired and the fault is cleared.

A reset may temporarily clear the code from the display, but if the underlying fault in the sensor circuit has not been fixed, the F4-E0 error will return as soon as the oven runs a diagnostic cycle or attempts to heat. A reset is not a repair. The sensor resistance and wiring connections must be confirmed as correct before the fault will stay cleared.

A knowledgeable DIYer can handle this repair if they are comfortable checking wiring connections and measuring resistance with a multimeter. Start by reseating the lower cavity sensor connector, then measure the sensor resistance at a known temperature and compare it to the 1080-ohm baseline at 70°F. If the sensor reads open or out of range, replacing the sensor is a straightforward part swap. Control board replacement is more involved and may warrant a professional technician.

If the fix is simply reseating a loose connector, there is no parts cost involved. A replacement lower cavity temperature sensor typically costs in the range of $20 to $60 for parts. If the control board is at fault, board replacement parts can range from $150 to $350 or more, with additional labor costs if a technician is hired.