Frigidaire Range Error Code F18

The F18 code on a Frigidaire range indicates an Oven Relay Board failure. The control system has detected that the relay board, which switches power to the oven's heating elements, is defective. This code is a direct component failure indication rather than a sensor or wiring fault. Replacing the relay board is the prescribed repair.

No, you should not continue using the oven when F18 is active. A failed relay board can cause the heating elements to behave unpredictably, including heating without shutting off, which is a potential fire and safety hazard. Discontinue oven use until the relay board has been replaced.

Resetting the range by cutting power at the breaker may temporarily clear the F18 code, but the code will return because the relay board itself is defective. A reset does not repair the failed hardware. The only reliable fix is to replace the oven relay board.

A knowledgeable DIYer can replace the oven relay board, but the repair does involve working near high-voltage components. The range must be fully disconnected from power before beginning any work. If you are comfortable with appliance disassembly and electrical safety precautions, this is a board-swap repair. Otherwise, hiring a qualified technician is the safer option.

Parts and labor costs vary by model and region. A replacement oven relay board typically costs in the range of $50 to $150 for the part alone. If you hire a technician, total repair costs including labor generally fall in the range of $150 to $350. Getting a quote before authorizing the repair is recommended.