LG Microwave moderate

F-5 Door switch error - not detecting door closed

The LGF-5 error code on your microwave indicates: Door switch error - not detecting door closed. This typically requires troubleshooting the door system.

Reported on: LMV2031STLMVH1711ST
Diagnosis

What Causes This Error

1

Door latch or lock mechanism jammed

high

The door latch assembly is stuck in the locked or unlocked position.

2

Door switch failure

high

The switch that detects door open/closed state has failed electrically.

3

Misaligned door

medium

The door has dropped or shifted, preventing the latch from engaging properly.

4

Wiring issue to lock motor or switch

low

A wire to the door lock assembly has come loose or broken.

Repair Guide

How to Fix Error F-5

  1. 1

    Power cycle the appliance

    Unplug for 5 minutes. Door lock mechanisms often reset after a power cycle. Plug back in and try opening/closing the door.

  2. 2

    Inspect the door latch

    Look at the latch mechanism where the door meets the frame. Check for food debris, mineral buildup, or visible damage preventing it from clicking into place.

  3. 3

    Clean the latch area

    Wipe down the latch, striker plate, and surrounding area with a damp cloth. Dry thoroughly. Accumulated grime is a common cause of latch errors.

  4. 4

    Check door alignment

    Close the door slowly and watch if it lines up with the frame evenly. If the door has sagged, the hinges may need adjustment or replacement.

  5. 5

    Test the door switch

    The door switch is usually a small button-style switch near the top or side of the door opening. Press it by hand — you should hear/feel a click. Test for continuity with a multimeter.

  6. 6

    Replace the door latch or switch

    If the latch is broken or the switch doesn't click, order a replacement. Most are held by 2 screws and a wire connector.

Parts

Replacement Parts

If the steps above don't fix it, you may need one of these parts:

Door Switch (Interlock)

$5-$15
Amazon PartSelect

Door Latch

$5-$12
Amazon PartSelect

When to Call a Professional

If the door won't close properly after cleaning the latch, or if multiple switches need testing

  • Microwave interlock switches are a safety-critical system — incorrect reassembly can allow the microwave to run with the door open
  • Forcing a stuck door can break the latch hooks
  • Some models have 3-4 interlock switches that must be tested individually
Video Repair Guide Search "LG microwave error F-5 fix"

Models Affected

LMV2031STLMVH1711ST