Can I fix LG code FU myself?

Start with these safe checks: Unplug for 60 seconds and plug into a wall outlet directly. Make sure the freezer is set to 0°F (-18°C), vents aren't blocked, and doors seal (a sheet of paper closed in the door should resist being pulled out). If FU continues, request service.

When should I call a technician for code FU?

If FU continues, request service. Don't open the sealed refrigerant system, cut or braze lines, or add refrigerant. That needs an EPA-certified technician. Turn power off at the breaker or disconnect before opening any panel, and leave capacitors, compressors and control boards to a pro: they can hold a dangerous charge even with the power off.

LG Refrigerator Error Code FU: Freezer not cooling (cycle error)

What FU means

The freezer didn't get cold enough within the expected time, or warmed up during operation.

Likely causes

Doors opened often or left ajar
Food blocking vents
Worn door gaskets

Safe first checks

Unplug for 60 seconds and plug into a wall outlet directly.
Make sure the freezer is set to 0°F (-18°C), vents aren't blocked, and doors seal (a sheet of paper closed in the door should resist being pulled out).

When to stop

If FU continues, request service.

Checked against: LG USA Support: LG Refrigerator digital and analog error codes. Codes can differ by model and year, so confirm with your owner's manual.