Kenmore Range Error Code F40

F40 on a Kenmore range indicates a cooktop lockout failure. It means the main Electronic Oven Control has lost communication with the cooktop lockout board, which is the module that controls whether the surface burners can be activated. This code appears on select Kenmore models that include a dedicated lockout board as part of their control system.

The F40 code points to a failure in the cooktop lockout control circuit, which means the system that manages burner activation is not functioning correctly. Operating the range in this condition is not advisable until the fault is diagnosed and repaired, as the lockout system may not respond as intended.

Repair costs depend on which component has failed. If only a wiring connector needs to be reseated, there may be no parts cost, just a service call fee. Replacing the cooktop lockout board typically costs between $80 and $200 for the part, while replacing the EOC can range from $150 to $400 or more depending on the model, plus labor if a technician performs the repair.

Some causes of the F40 code are DIY-friendly, such as reseating a loose connector between the EOC and the cooktop lockout board. However, testing harness continuity, identifying burned terminals, and replacing control boards require basic electrical knowledge and comfort working inside the appliance. If you are not experienced with appliance wiring, a qualified technician is recommended.

Resetting the range by cutting power at the breaker may temporarily clear the code, but it will return if the underlying fault is still present. The F40 code reflects an actual hardware or wiring issue that must be diagnosed and corrected for the fault to be permanently resolved.