KitchenAid Microwave Error Code F8-E3

F8-E3 indicates the microwave detected an over-temperature condition in the oven cavity while the door was open or the latch was in the unlocked position. This is a safety fault that shuts down the unit to prevent unsafe operation. It points to a problem with one or more components in the door latch system, including the latch motor, latch switch, or door open/closed switch.

Disconnecting power for several minutes may temporarily clear the displayed code, but the fault will return if the underlying component failure is not repaired. Because F8-E3 involves both a thermal condition and a door status failure, simply resetting the unit does not address the root cause. The latch motor, latch switch, and door switches need to be physically tested and replaced as needed.

Repair costs depend on which component has failed and whether you hire a technician or replace parts yourself. A door switch or latch switch typically costs between $10 and $40 for the part alone, while a latch motor or full latch assembly may run $30 to $100 or more. Adding professional labor, total repair costs can range from $100 to $250 or higher depending on your location and the extent of the diagnosis needed.

No, you should not use the microwave until the fault has been diagnosed and repaired. F8-E3 indicates a potential failure in the door latching system, which is a primary safety barrier that prevents microwave energy from being emitted with the door open. Disconnect power to the unit and do not operate it until the latch assembly and associated switches have been inspected and confirmed to be functioning correctly.

Start by disconnecting power to the microwave completely before opening any panels. Inspect the latch assembly for visible damage or debris, then test the latch motor, latch switch, and door open/closed switch for proper continuity and operation. Replace any component that fails testing. If the thermal system is also suspect, check the thermal cutout for continuity as well.