How an LG refrigerator reports a fault
An LG refrigerator monitors its compartments, its fans and its defrost system through sensors and the main control, so trouble shows up as an “Er” alert on the display — and the display often drops the “Er” prefix, so you may simply see two letters. Reading the alert is the quickest way to an accurate LG refrigerator repair, because each one points at a fan, a sensor, the defrost system or the controls. These apply across French-door, side-by-side, top-freezer and InstaView models.
The alerts you will see
rF is the fridge (fresh-food) fan, FF the freezer fan, and CF the condenser fan — any of which chokes airflow and lets the cabinet warm. dH flags a defrost cycle running over an hour, dS a defrost sensor, and FS/rS the freezer or fridge temperature sensors. gF points at a water-flow or low-pressure issue, IF at the ice-maker fan, and Ad at the auto-door motor — not auto-defrost. The serious pair, CL E and CH E, point at a refrigerant leak and warrant prompt service.
Indicators that are not faults
Sb is Sabbath mode, and OF F (or OFF) is demo/display mode, which disables cooling — a common reason a fridge appears not to cool after a reset or store display, cleared by holding the indicated pads. 88 simply means the diagnostic check passed. The Ad-code glossary clears up the auto-door mix-up.
What to check, and when to call
For a sensor or fan alert, confirm the doors seal, the unit is not in demo mode and the condenser is clean, then allow recovery time after a large load. A persistent rF/FF/CF fan code, a dH defrost fault, a gF water-flow fault or any CL E / CH E leak alert needs an experienced technician with genuine parts. Read the Er IF / Er FF / Er rF guide and the not-cooling guide, see the full list in the error codes library, then book refrigerator repair. Confirm your model on the manufacturer’s site at lg.com/us.