LG refrigerator not cooling? What to check, in order

1. Did anything just change?

A fridge that was just installed, moved, repaired or switched back on is often simply not cold yet. Give it time before you look for a fault.

• •After installation or a repair: LG says reaching normal temperature can take 2–3 days, depending on how much food is inside.
• •After changing a setting: change it one step at a time and wait 24 hours.
• •After a power outage: allow up to 24 hours. If the fridge was laid on its side, stand it upright for 24 hours before plugging it in.
• •After a manual defrost: allow 24–48 hours.

2. Power and temperature settings

• •Plugged in, breaker on, and the control not set to OFF.
• •LG’s defaults are 37°F in the fridge and 0°F in the freezer. LG recommends 34–37°F for the fridge and calls 41–43°F too warm; the FDA says 40°F or below. An appliance thermometer settles any doubt.
• •If the buttons don’t respond, the panel is probably locked: hold Lock for 3 seconds.

3. “O F F” on the display: demo mode

If the display shows O F F, the fridge is in display (demo) mode: lights and display work, but neither compartment cools. On models from 2019 on (serial number starting with 901 or higher), open the door, hold Ice Plus and Refrigerator until the second beep, then keep holding Refrigerator and press Ice Plus three times. On 2018 and older models, hold Refrigerator and Ice Plus for 5 seconds.

4. Airflow: don’t overpack, keep the vents clear

LG’s advice is to keep the fridge no more than about 70% full and to keep the air vents in both the fridge and the freezer clear. Food pushed against a vent can leave one section warm while the other is fine.

5. Doors and gaskets

• •If the door alarm goes off with the doors closed, LG lists three causes: something blocking a door, a dirty gasket, or a fridge or doors that aren’t level.
• •Clean the gaskets with a soapy cloth. A torn or flattened gasket needs replacing.
• •The paper test: close the door on a sheet of paper around the edge. If it slides out easily, the seal leaks at that spot.

6. The condenser at the back

The condenser coils and fan sit in a compartment at the bottom rear. Unplug the fridge, then vacuum and wipe the rear cover. LG says not to remove that cover yourself: the gas pipes behind it are easy to damage. Keep the clearance your manual asks for (on many LG French-door models about 2 inches behind). A CF code means the condenser fan has failed, which is a service call.

7. Listen for the freezer fan

With the doors closed you should hear the fan and feel air from the vents. On many LG models the fan stops when a door opens; pressing the door switch with the door open lets you hear it run. An FF (freezer fan), rF (fridge fan) or IF (ice fan) code usually means the fan is blocked by frost: LG’s advice is a manual defrost first, then service if the code comes back.

8. Frost on the back wall of the freezer

• •LG fridges defrost themselves every 4–16 hours. A thick layer of frost on the back panel means the air can’t get through.
• •Causes LG lists: a door not sealing, a damaged gasket, the fridge not level, the freezer set colder than 0°F, hot food put inside, or a freezer that is overfull or almost empty.
• •Manual defrost: unplug, empty it, leave the doors open for at least 8 hours with towels down, dry it, plug it back in and give it 24–48 hours.
• •If cooling comes back and fades again within days, the defrost system (heater, sensor or board) has failed and needs service. A dH code means the same.
• •A sheet of ice on the freezer floor that keeps coming back usually means a blocked drain, also a service call.

9. When it’s the compressor or the sealed system

• •Both compartments warm up together while the lights, display and fans keep working, and temperatures climb into the 50s and on toward room temperature.
• •The compressor runs but nothing gets cold, or it clicks and stops without starting.
• •Codes that point here: CH or CL, LG’s refrigerant (sealed-system) codes for the high and low side, and on LG’s list 22 or 33 for the compressor relay.
• •This is a sealed-system repair: refrigerant recovery, a new compressor and filter-drier, vacuum and recharge. It is a job for a certified technician, not a DIY one, especially as many newer LG fridges use flammable R-600a refrigerant.
• •LG’s warranty covers the compressor and sealed system, parts and labor, for 5 years from purchase. For the linear compressor LG still covers the part in years 6–10, and you pay labor. Keep your receipt.

What’s normal

• •In a 70°F kitchen the compressor can run 40–80% of the time.
• •Clicks when defrost starts and ends, and pulsing or high-pitched sounds, are normal LG sounds.