F90
LG
Door Lock Motor Failure
LG oven shows F90 and the door remains locked or will not lock for 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
Burned-out door lock motor, Jammed latch mechanism, Faulty door lock switch, Wiring issue to lock motor
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker. Do not force the door open if the oven is hot.
- Wait for cooling: If the error occurred during self-clean, allow the oven to cool fully. The lock may release once safe.
- Manual release (if needed): On some models, you can access a manual release lever through the top or rear panel. Consult the service manual for your specific LG model.
- Inspect lock assembly: Remove the top or rear panel to access the door lock motor assembly. Check for broken plastic parts, seized linkage, or signs of overheating.
- Test motor and switch: Use a multimeter to check motor winding resistance and the lock position switch. Replace the entire lock assembly if either is faulty.
- Check harness: Ensure the wiring from the lock to the control board is intact and connectors are secure.
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Repair Difficulty
Hard
4/5
Required Part
Oven Door Lock Motor Assembly
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