LG Refrigerator Er FF — Freezer Evaporator-Fan Fault

What the LG Er FF code means

LG defines Er FF as “an abnormality in the freezer/refrigerator compartment fan motor.” The evaporator fan lives behind the rear panel inside the freezer and pushes cold air through both compartments. The board watches a feedback signal from that fan; when the fan does not spin at the expected speed, it flags FF. Because the fan usually stalls after ice locks the blade, Er FF is really a symptom of a defrost problem as often as a fan failure. Do not confuse it with Er rF, which points at the refrigerator-section fan, or refrigerant/cooling faults — FF is specifically the freezer evaporator fan.

Most likely causes (ranked)

Likelihood	Cause	What is happening
Most common	Ice jamming the fan blade	A failed defrost cycle lets frost build on the blade and shroud until it physically locks.
Common	Failed evaporator fan motor	Motor windings or bearings wear out (typical life ~8–12 years), so it no longer spins.
Common	Underlying defrost failure	A bad defrost heater, thermostat, or sensor lets frost return — the reason the ice formed.
Less common	Damaged wiring or connector	A pinched or cracked harness breaks the fan’s feedback signal to the board.
Least common	Faulty main control board	The board fails to read a good fan signal even though the motor runs.

How to fix it, in order

1. Power reset — unplug the refrigerator (or trip its breaker) for about 5 minutes, then restore power. A transient fault can clear here; a real fault will return.
2. Full manual defrost — if the code comes back, LG’s own fix is to unplug the unit and leave both doors wide open so the ice around the fan melts: about 1 day in summer, up to 3 days in winter. Move food to a cooler and lay towels to catch meltwater.
3. Speed it up (optional) — to shorten the thaw, remove the rear freezer evaporator panel (a few Phillips screws) and melt the visible ice with a hair dryer on low, kept ~6 inches back from plastic. Never use anything sharp on the coils.
4. Spin-test the fan — with the unit unplugged and panel off, flick the fan blade by hand. It should spin freely. A blade that is stiff or grinds indicates a failing motor bearing.
5. Test the fan motor — check the motor for continuity/resistance with a multimeter; an open or out-of-range reading means the motor is dead and needs replacing.
6. Inspect the wiring — look for a pinched, chafed, or disconnected harness at the fan connector before condemning any part.
7. Address the defrost system — if ice keeps returning after a thaw, the real fault is the defrost heater, thermostat, or sensor. Diagnosing these, and any board replacement, is best done by a technician.

Parts that may be involved

• Evaporator fan motor — the freezer fan itself; the primary replacement part when the motor has failed.
• Defrost heater — melts frost off the evaporator each cycle; a failed heater is why ice returns.
• Defrost thermostat / sensor — tells the control when to run defrost; a common root cause of ice buildup.
• Wiring harness / fan connector — carries power and the feedback signal; checked for damage.
• Main control board — reads the fan signal; replaced only after other causes are ruled out.

Difficulty and time

The reset and manual defrost are easy but slow — plan for the fridge to be out of service for a day or more, so have a cooler ready. Removing the evaporator panel and replacing the fan motor is an intermediate job of about an hour with a nut driver and multimeter. Anything involving the defrost heater, sensors, control board, or the sealed refrigerant system should go to a professional.

When to call a pro

• Er FF returns immediately after a full thaw — the fan motor or control board likely needs replacing.
• Ice rebuilds within days, pointing at a defrost heater/thermostat/sensor failure.
• You would need to touch the sealed system (compressor, refrigerant lines) — this legally and safely requires a certified technician.
• You see refrigerant staining or hear hissing near the coils, or you are worried about food safety during a long defrost.

FAQ

Will my food spoil while I fix Er FF?

A full manual defrost means the unit is off for a day or more, so move perishables to a cooler with ice. If you cannot afford that downtime, a technician can melt the ice and replace the fan faster than an ambient thaw.

Why does the fan keep icing up again?

A fan that re-ices after a thaw is telling you the defrost system has failed — usually the defrost heater, thermostat, or sensor is not clearing frost on schedule. Melting the ice fixes the symptom; the defrost part fixes the cause.

Is Er FF the same as Er rF?

No. Er FF is the freezer evaporator fan; Er rF refers to the refrigerator-compartment fan. They are related air-circulation faults but point at different fans, so confirm which code you actually see.

Browse more refrigerator fault codes or the full LG error code index for related freezer and cooling faults.