Frigidaire Range Error Code F40

F40 on a Frigidaire range indicates a cooktop lockout failure, meaning the main oven control board has detected a problem communicating with the cooktop lockout board. This fault is present only on models equipped with a separate cooktop lockout module. It can be caused by a loose wiring connection, a damaged harness, or a failed control board.

A power reset by unplugging the range or switching off the circuit breaker for a few minutes may temporarily clear the F40 code, but it will return if the underlying problem is not fixed. If the fault is caused by a loose connector, reseating it and then resetting may resolve the issue permanently. A reset alone will not fix a failed lockout board or a damaged harness.

Repair costs vary depending on what component is at fault. If only the wiring harness needs repair or a connector needs reseating, costs may be limited to a service call fee, typically in the range of $75 to $150. A cooktop lockout board replacement adds parts costs that can range from $50 to $200 or more depending on the model. If the EOC requires replacement, total repair costs including labor could range from $200 to $450 or higher.

Some DIYers can resolve F40 by locating and reseating the wiring connectors between the oven control and the cooktop lockout board, which requires accessing the back or interior of the range. If the connectors are secure, testing harness continuity with a multimeter is the next step. Board replacements are straightforward for those comfortable with appliance repair, but if you are unfamiliar with working around live circuits, a qualified technician is the safer choice.

The F40 fault relates to the cooktop lockout control system, and the range may disable cooktop burner operation while this fault is active as a precaution. Oven functionality could also be affected depending on the model. It is best to avoid relying on the appliance until the fault is diagnosed and repaired to ensure safe and predictable operation.