Kenmore Oven Error Code F83

The F83 code on a Kenmore combination oven/microwave means the microwave control board detected a sudden, extreme change in the microwave thermistor's value that is consistent with a fire inside the microwave cavity. The unit shuts down automatically when this condition is detected. You need to inspect the cavity for any signs of combustion, charring, or damage before attempting to use the microwave again.

Resetting the unit by disconnecting power may clear the fault code, but it will not resolve the underlying condition that caused it. If the cavity is not inspected and cleaned, or if a damaged component is not replaced, the F83 fault is likely to return during the next cooking cycle. Always address the root cause before restoring power.

Repair costs vary depending on the root cause. If only cleaning and a replacement waveguide cover are needed, costs are typically in the range of $10 to $40 for parts. If the microwave thermistor requires replacement, parts and labor may run between $75 and $175. A control board replacement, if needed, can bring the total repair cost to $150 to $350 or more depending on the specific model and local labor rates.

Do not use the microwave until you have thoroughly inspected the cavity for damage. Check the waveguide cover, turntable, and all interior walls for charring, cracking, or burned residue. If any components show heat or fire damage, they must be replaced before the unit is operated. Attempting to run a damaged microwave can create a repeat fire or electrical hazard.

Start by unplugging the unit and carefully inspecting the entire microwave cavity for signs of fire, including charring, burned food, melted material, or a damaged waveguide cover. Remove and clean the turntable and clean all interior surfaces. Replace the waveguide cover if it shows any burning or cracking. If no visible cause is found, have a technician test the microwave thermistor and control board for proper function.