Kenmore Oven Error Code F80

F80 indicates a communication problem between the User Interface Board and the Microwave Control Board in a Kenmore combination oven and microwave unit. The User Interface Board is unable to initiate communication with the Microwave Control Board. This can result from a loss of power to the microwave section, a wiring fault between the two boards, or a failure of either control board.

Start by opening the microwave door and checking whether the cavity light turns on. If it does not, investigate the power supply by checking external circuit breakers, internal chassis fuses, and the door switch. If the cavity light is on, inspect the wiring harness and connectors between the User Interface Board and the Microwave Control Board for loose or damaged connections. If wiring is intact, one or both control boards may need to be replaced.

Repair costs vary depending on what component has failed. If only a fuse or a wiring connection is at fault, costs may be relatively low, typically in the range of $20 to $100 for parts and minimal labor. Replacing a Microwave Control Board or User Interface Board generally costs more, with parts and labor combined often ranging from $150 to $400 or higher depending on the specific unit and service rates in your area.

A reset by cutting power at the breaker may temporarily clear the display, but F80 will return if the underlying cause is not resolved. If the microwave section has no power, a wiring connection is broken, or a control board has failed, the error will reappear as soon as the unit tries to re-establish communication between the boards.

The F80 fault itself indicates a communication failure and typically prevents normal microwave operation, which means the microwave section may be non-functional. It is not a fire or shock hazard by itself, but you should avoid attempting to use the microwave while the fault is active. If the fault involves a failed door switch, that component should be inspected and repaired promptly, as door switches are part of the microwave's safety interlock system.