LG Frequency Out of Range / Power Line Frequency Error

Dryer displays FO or F0 and may not start or respond correctly.

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.

Possible Causes

Unstable power supply, Inverter or generator power with poor frequency control, Faulty main PCB frequency detection circuit

Safety: No internal work is usually required initially.

Steps:

Check power source: Ensure the dryer is connected to a stable mains supply, not a small portable generator or inverter.
Power reset: Unplug the dryer for 5–10 minutes, then reconnect and test.
Electrical evaluation: If FO recurs on a stable supply, the main control board may be defective and require replacement.

Medium 3/5

Main Control Board

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