F90
LG
Door lock motor or switch failure
LG range displays F90 and the oven door will not lock or unlock during self-clean.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed door lock motor, Misaligned door latch, Faulty door lock switch, Wiring issue between lock and control
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker. Allow the oven to cool completely if recently used.
- Manual unlock: Remove the rear top panel to access the door lock mechanism. Manually move the latch arm to unlock the door.
- Inspect mechanism: Check for bent or broken latch parts, loose screws, or disconnected rods. Correct any mechanical issues.
- Test lock motor: With power OFF, disconnect the lock motor and measure resistance. An open motor indicates failure; replace the lock assembly.
- Check switches: Many lock assemblies have position switches. Test continuity as the latch is moved. Replace the assembly if switches do not change state.
- Replace lock assembly: Install a new LG door lock motor assembly if any component is defective.
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Repair Difficulty
Hard
4/5
Required Part
Oven Door Lock Motor Assembly
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