Microwave displays F5 and may not start or may stop mid-cycle

Safety: Unplug the microwave and allow several minutes for internal capacitors to discharge. Do not touch high-voltage components.

• Power cycle: Disconnect power for 5–10 minutes, then reconnect and test. If F5 returns immediately, proceed.
• Access control board: Remove the outer cabinet and control panel to expose the electronic control board.
• Visual inspection: Look for burnt spots, cracked solder joints, or melted relay cases on the board.
• Listen for relay click: When starting a cook cycle (with cabinet reinstalled for safety), listen for the relay click. No click or repeated clicking may indicate a bad relay.
• Replace control board: Whirlpool typically does not support field replacement of individual relays. Replace the entire electronic control board with the correct part number for your model.

Note: Because this involves line-voltage switching, if you are not experienced with electrical repairs, contact a professional technician.