What's the difference between FS, rS, dS and rT?

They identify which specific sensor is reporting a short or open circuit — freezer, fridge, defrost or room temperature. The distinction matters for diagnosis, but the practical next step is the same: it's a sensor-level repair, not something to troubleshoot yourself.

My LG fridge shows IF — is that the same as an ice maker that's just slow?

IF specifically points to the ice maker fan, not general ice production speed. If ice is just slower than usual without a code showing, see our guide on an ice maker not making ice.

Is LG's 10-year compressor warranty still valid on my fridge?

Many LG refrigerators carry a 10-year compressor warranty, but terms vary by model and purchase date — check directly with LG using your model and serial number before assuming it's expired.

LG Refrigerator Error Codes: Er FF, Er IF, Er dH

Error codes

Search codes

LG Refrigerators

Code	What it usually means
FF	Freezer fan issue, possibly frost buildup
rF	Fridge fan motor abnormality, possibly frost buildup
IF	Ice maker fan problem
CF	Condenser fan feedback error
dH	Defrost ran more than 1 hour without finishing
FS / rS / dS / rT	Freezer / fridge / defrost / room temperature sensor short or open
gF	Flow sensor error or low water pressure
CO	Communication error, control board to display
22 / 33	Compressor relay problem
CL E / CH E	Low-side / high-side refrigerant leak
OF F	Demo mode: cooling disabled, not a fault

Source: LG support

What you can check yourself

0 / 4 checked

For FF (freezer fan) or rF (fridge fan), unplug the refrigerator and leave the doors open for a few hours to let frost melt off the fan blades, then restart.
For dH (defrost ran too long), check that nothing is blocking airflow around the vents inside the freezer compartment.
For gF (flow sensor / low water pressure), check the water line isn't kinked and the household water pressure is normal elsewhere in the home.
For CO (communication error), power-cycle the refrigerator — unplug for a minute, then restart.

Still not working? A technician can take it from here.

Book a visit

When to call a technician

Call a technician for 22/33 (compressor relay) or CL E/CH E (refrigerant leak) — refrigerant work specifically should never be attempted by anyone other than a certified technician.

Call now Text now

If your LG fridge has stopped cooling entirely

A code is one thing — a fridge that's gone fully warm while the freezer still runs cold is a different, more specific symptom worth its own guide. LG's linear compressor has a documented failure pattern on some model years; see our dedicated guide before assuming the worst or paying for a repair out of pocket.

OF F isn't a fault

If your display shows OF F, the refrigerator is in demo/showroom mode with cooling intentionally disabled — this sometimes gets triggered by accident through the control panel. Check your owner's manual for how to exit demo mode on your specific model.

A note on this brand's codes: Codes vary by model and production year — check your owner's manual or LG's support site for your exact model if your display shows something not listed here.

Sources: LG support — refrigerator error code list

LG Refrigerator Error Codes: Er FF, Er IF, Er dH, Er rS and More