Er FF (also shown as FF) on an LG refrigerator means the freezer evaporator fan — the fan that moves cold air through the whole fridge — isn't running normally. When it stops, both the freezer and fridge start warming. The most common root cause is ice jamming the fan blade because the defrost system isn't keeping up. Here's how a tech works it.
The #1 cause of Er FF. If the defrost circuit (heater, sensor, or thermostat) isn't fully melting frost, ice builds on the evaporator and blocks the fan — so it errors out and the box warms.
Check it: This is a tech diagnosis: the fan error is the symptom, the defrost circuit is the root. A tech clears the ice and repairs what caused it so it doesn't rebuild.
The fan motor can wear out or seize on its own, with no ice present.
Check it: A tech pulls the evap cover, spins the fan, and ohms the motor; a dead motor is an affordable replacement.
A loose or corroded fan connector breaks the signal and throws Er FF.
Check it: A tech inspects the fan wiring and connector during testing.
Occasionally a one-time fault triggers it.
Check it: Unplug the fridge ~5 minutes and restore power. If Er FF returns or the box is warming, it needs a tech — don't keep resetting a warming fridge.
Repair — a fan motor is affordable and even a defrost repair is far below a new fridge. Fixing the defrost cause is what keeps the ice — and Er FF — from coming back.
In Middle Tennessee or the Baton Rouge area? We'll come to you, same-day. Anywhere else in the U.S.? Send a 10-second video, a real technician tells you exactly what's wrong for $50 (credited toward the repair), and we ship you the exact part. 24/7 — text, call, or upload anytime.
It's a freezer evaporator fan error — the main cooling fan isn't running normally, so the fridge and freezer warm up. Most often ice from a defrost problem is jamming the fan.
A power reset (unplug ~5 min) may clear a one-time glitch, but if it returns or the fridge is warming, it needs a tech — usually to clear ice off the freezer evaporator fan and repair the defrost circuit behind it.
It can warm both compartments and spoil food, and the common cause (a defrost failure icing the fan) needs proper repair so it doesn't recur. Your $50 Quick Check credits toward the repair.