Microwave displays F9 and may not start or may stop mid-cycle; sometimes associated with door issues.

Safety: Unplug the microwave before working near the door switch area. Door switches are part of the safety interlock system.

• Inspect door alignment: Check that the door closes evenly and latches firmly. Look for sagging hinges or warped door.
• Check latch hooks: Open the door and inspect the plastic latch hooks that engage the switches. If cracked or loose, the latch assembly may need replacement.
• Access door switches: Remove the control panel and, if needed, the side cover to expose the door switch bracket. You will typically see 2–3 microswitches.
• Test switches (for trained users): Using a multimeter, test each switch for proper continuity when the door is opened and closed. Replace any switch that does not change state correctly.
• Secure bracket: Tighten any loose mounting screws on the switch bracket so the switches align correctly with the latch hooks.

Because door switches are critical safety components, if you are unsure of your work, have a professional complete the repair.