F5
LG
Oven control self-check failure
LG range displays F5 and oven functions may be disabled.
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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
Internal main control board fault, Power surge or brownout damage, Corrupted control firmware
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before removing any panels.
- Power reset: Turn the breaker OFF for 10 minutes to fully discharge the control. Turn it back ON and test the oven. If F5 returns immediately, the control is likely defective.
- Check supply voltage: Verify the range is receiving correct voltage (typically 240 VAC across L1–L2 and 120 VAC from each leg to neutral). Incorrect voltage can cause control errors; have a qualified electrician correct supply issues.
- Inspect control board: Remove the back cover and inspect the main control for burnt components or damaged traces. Any visible damage requires board replacement.
- Replace control: If F5 persists and power supply is correct, replace the main control board with the correct LG part number for your model.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (ERC)
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