Panasonic Microwave Error Code F04

F04 on a Panasonic microwave means the unit is detecting incoming line voltage that is too high for safe operation. The microwave shuts down to protect its internal components, including the magnetron and high-voltage capacitor. The fault can be caused by an incorrectly configured voltage selection plug inside the unit or by an actual over-voltage condition at the electrical supply.

No, you should not attempt to use the microwave while F04 is active. The error indicates the unit may be receiving more voltage than its components are rated to handle. Continuing to operate it under an over-voltage condition could damage the magnetron, capacitor, or control board, and may present a fire or shock hazard.

If the fix is simply replacing the voltage selection plug, the cost is typically low, often in the range of a few dollars to around $20 to $40 for the part. If the issue is a faulty control board, repair costs can range from $80 to $200 or more depending on labor and parts. If the problem is in your home's electrical wiring or panel, you would need a licensed electrician, and costs vary widely based on the scope of the wiring issue.

Start by replacing or reseating the voltage selection plug, which is the recommended first diagnostic step for this fault code. If that does not clear the error, measure the voltage at your wall outlet with a multimeter to check for a genuine over-voltage condition. If the wall voltage is too high, the issue must be corrected at your home's electrical supply, not inside the microwave.

Unplugging the microwave and plugging it back in may temporarily clear the display, but the F04 fault will return if the underlying cause has not been resolved. The root issue, whether it is the voltage selection plug or an actual over-voltage supply, must be corrected for the error to stay cleared.