- Appliances
- Washing machines
FF
LG FF on a washer: frozen water in hoses or drum
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
On an LG washer, FF (or u51) means freezing: the temperature has dropped below 1 °C. Pour 50 to 60 °C water into the drum, wait 1 to 2 hours, drain it and run a rinse. If the hoses are still frozen, disconnect and thaw them in warm water.
Safety first
Stop and check this first
- Use 50 to 60 °C water, as LG says, not boiling water, and do not use flames or heaters on hoses or the casing to thaw them.
Safe checks you can perform
- Where the washer is and how cold it is
- Warm water in the drum
- Thaw the inlet hoses
Leave these tasks to a qualified professional
- Do not attempt this professional task: Freeze damage inspection
- Do not attempt this professional task: Fill, wash and drain test
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Freeze damage inspection
What they doIf leaks or other codes appear after thawing, the technician checks the pump, inlet valve and internal connections for cracks caused by ice.
They must show youthe damaged part or proof that everything is watertight.
In writingwhich part was damaged, its number and the reason for replacing it.
Fill, wash and drain test
What they doAfter the inspection, they run a full programme to check water enters, drains and does not leak.
They must show youthe full programme without codes or leaks.
In writingthe test and its result.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Where the washer is and how cold it is
- Who:
- you, no tools.
- How:
- check whether the washer is in an unheated space and whether there has been a frost. LG links FF to temperatures below 1 °C.
- Result that matters:
- whether the cold explains the code.
- If it is cold or has frozen:
- go on to thawing.
- If the room is warm:
- note the code; FF without cold is unusual and the technician should know.
- Evidence to keep:
- note of the room temperature and date.
Evidence: LG USA front-load washer error code list
Warm water in the drum
- Who:
- you.
- How:
- pour 50 to 60 °C water into the drum, close the door and wait 1 to 2 hours; then drain the remaining water and run a rinse cycle, as LG says.
- Result that matters:
- whether the water drains and the rinse finishes without FF.
- If it finishes:
- the ice was in the drum or pump.
- If water still does not enter:
- check the inlet hoses.
- Evidence to keep:
- note of the waiting time and the result.
Evidence: LG USA front-load washer error code list
Thaw the inlet hoses
- Who:
- you, with the tap closed.
- How:
- disconnect the inlet hoses and thaw them in warm water, as LG suggests; reconnect them and open the tap.
- Result that matters:
- whether water enters normally.
- If it does:
- done; protect the washer from the cold.
- If it does not, or another code appears after thawing:
- call service.
- Evidence to keep:
- photo of any new code.
Evidence: LG USA front-load washer error code list
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- LG
- Product type
- Washing machines
Known code variants
- F F
- lavadora LG error FF congelada
- LG FF freeze failure
- LG FF hielo
- LG lavadora FF
- LG washer FF
- LG washer FF frozen
- u51
What it means
LG's front-load list defines FF and u51 as freeze failure, with the temperature below 1 °C. It happens with washers installed in garages, outbuildings or unheated spaces, where water left in the hoses, pump or drum freezes. LG says to pour 50 to 60 °C water into the drum, wait 1 to 2 hours, drain the residual water and run a rinse, and to thaw the inlet hoses separately if needed. If another code appears after thawing, the ice may have damaged something; FF on its own does not say so.
Warnings and stop conditions
- Loweditorial warning
Use 50 to 60 °C water, as LG says, not boiling water, and do not use flames or heaters on hoses or the casing to thaw them.
Evidence: LG USA front-load washer error code list
Symptoms and causes
Probable causes · in order
- Frozen water in the drum or pumpCommon
What LG describes below 1 °C. Fits if the washer is in a cold place and the code appeared after a frost.
Evidence: LG USA front-load washer error code list
- Frozen inlet hosesPossible
LG suggests disconnecting and thawing them in warm water. Suspected if no water enters with the tap open.
Evidence: LG USA front-load washer error code list
Virtual technician
Does FF still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
LG USA front-load washer error code list
LG Electronics · 2026 · official_doc
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