Jenn-Air Oven Error Code FF

FF on a Jenn-Air oven means the power relay board has received an invalid temperature reading from the oven temperature sensor. The board cannot interpret the signal it is getting, so it shuts down and displays FF. The fault is usually caused by a failed temperature sensor, a wiring harness problem, or a defective power relay board.

No. When the FF code is active, the oven will not heat because the power relay board has shut down relay operation due to the invalid temperature signal. Attempting to run the oven in this state serves no purpose, and the root cause of the fault needs to be resolved before the oven will function. Do not attempt workarounds or bypasses on the temperature sensing circuit.

Powering the oven off at the breaker for a few minutes may temporarily clear the FF code, but it will return as soon as the oven attempts to operate if the underlying sensor or harness problem has not been fixed. A reset is useful for confirming the fault is persistent and not a one-time power glitch, but it is not a repair.

Start by unplugging the oven and locating the temperature sensor probe at the back wall of the oven cavity. Disconnect the sensor and measure its resistance with a multimeter. At room temperature, most Jenn-Air oven sensors read approximately 1080-1100 ohms. If the reading is open, shorted, or significantly outside that range, replace the sensor. If the sensor reads correctly, inspect the wiring harness between the sensor and the power relay board for burnt connectors, broken wires, or loose terminals. If both the sensor and harness check out, the power relay board likely needs replacement.

A replacement oven temperature sensor for a Jenn-Air oven typically costs $20-$60 for the part, making it the least expensive fix if that is the cause. A new power relay board ranges from $100-$250 depending on the model. If you hire a technician, expect a service call fee of $75-$150 plus parts and labor. A confident DIY homeowner comfortable with multimeter testing and basic appliance disassembly can handle sensor and harness diagnosis without professional help.