LG · Washing machine

LG washer FF / u51 code

ErrorFF / u51

FF / u51 is listed by LG support as freeze condition detected. The exact checks and component layout can vary by model and region.

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Source-linked guidance reviewed against LG US front-load washer error codes.

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What the code means

Freeze condition detected

Pause the cycle before inspection. Water may be hot; use the model manual before opening a user-accessible drain filter.

Typical symptoms

01Controls can remain disabled when the washer temperature is below the operating threshold

02Water does not enter or drain because an inlet or drain path is frozen

03The code appears during prolonged cold weather

Likely causes

Start with the least invasive explanation and stop if the check requires internal electrical or sealed-system access.

01Freeze condition detected

Safe next steps

1
Move the washer area above 4°C and remove all laundry
Follow the exact model manual where access or reset steps differ by product series.
2
Pour warm—not boiling—water at about 50–60°C into the drum, close the door, and wait 1–2 hours
Follow the exact model manual where access or reset steps differ by product series.
3
Open the lower access cover and use the service tube to drain melted water; refit its cap securely
Follow the exact model manual where access or reset steps differ by product series.
4
Run one RINSE cycle after water flows freely
Follow the exact model manual where access or reset steps differ by product series.
5
If the weather is not cold or FF/u51 returns after thawing, request service
Follow the exact model manual where access or reset steps differ by product series.

When to stop

Stop if you see damaged wiring, smell burning, find an active leak, suspect gas or refrigerant, or need to remove a sealed electrical cover. Use a qualified appliance technician.