KitchenAid Microwave Error Code F6

The F6 code indicates a microwave relay failure involving Relay 4903. The fault is triggered when the control board detects that this relay is not switching correctly, or that its contact has welded closed in the on position. A welded contact means the circuit cannot be opened on command, which is both a functional failure and a safety concern. Power must be disconnected before any inspection or repair is attempted.

No, the microwave should not be used while displaying F6. A welded relay contact means the microwave may be unable to shut off its high-voltage circuit as intended, which poses a safety risk. Discontinue use and unplug the appliance until the relay has been inspected and the fault resolved.

Repair costs vary depending on whether the issue is limited to the relay or involves additional components like the wiring harness or control board. Relay replacement parts typically range from $15 to $60, while labor costs for a qualified technician can add $80 to $150 or more depending on your location. If the magnetron is also found to be contributing to the relay failure, total repair costs can increase significantly. Getting a diagnostic estimate before committing to repairs is recommended.

Diagnosing and repairing F6 involves working near high-voltage components, so this repair is best handled by a qualified appliance technician. The first step is always to unplug the microwave and allow the high-voltage capacitor to discharge before touching any internal components. A technician will inspect the wiring to Relay 4903, test the relay contact, and replace the relay if it has failed or welded closed. Attempting this repair without proper training and tools carries a serious risk of electric shock.

Unplugging the microwave and restoring power may temporarily clear the F6 code, but if Relay 4903 has physically failed or its contact has welded closed, the fault will return. The underlying hardware problem must be identified and corrected for the error to be resolved permanently. Do not rely on a reset as a fix for this fault.