Quick summary
First check display/demo mode and settings, then that air vents aren't blocked by food and doors seal properly. If codes like CF, FF or FU appear, or the compressor doesn't run, call a technician.
A modern fridge relies on the compressor, fans and sensors together. Weak cooling may come from usage (open doors, overcrowding), environment (summer heat and poor ventilation) or a real fault.
Unplug the appliance, close the water tap if there's a leak, and never open covers that need tools or expose wiring or circuits.
Possible causes
Display mode on
In display/demo mode, lights and display work without cooling—it's for showrooms.
Blocked air vents
Food pressed against vents stops cold air circulating.
Door gaskets
Leaking cold air causes weak cooling and condensation.
Dusty condenser, poor ventilation
In Jordan's summers, dust and tight spaces reduce heat rejection.
Fan faults
Codes such as FF (freezer fan) and CF (condenser fan).
Compressor or sealed system
Requires a qualified technician—never a user task.
Safe checks you can do
- Check settings: about 3° fridge and −18° freezer, as LG's guidance suggests.
- Make sure the fridge isn't in display mode (see the manual to disable).
- Move food away from vents in both compartments.
- Test gaskets: close the door on a sheet of paper; if it slides out easily the seal may be poor.
- Leave ventilation space behind and beside the fridge per the installation guide; keep it out of direct sun.
- If a code shows, unplug for 60 seconds and reconnect to a direct socket (as LG suggests for FU).
When to stop checking immediately
- Never open the sealed system or handle refrigerant.
- If CF, FF or sensor codes appear—call a technician.
Related components
- Compressor
- Condenser
- Fans
- Temperature sensors
When do you need a technician?
The technician checks compressor and fan operation, sensors, the defrost system and the board, measuring performance without opening the sealed system unless necessary and with proper equipment.
Related error codes
FAQ
What temperature should an LG fridge be?
LG's guidance suggests about 3° for the fridge and −18° for the freezer. Check your model's manual.
Why is the fridge cold but not the freezer, or the reverse?
It can indicate a fan, defrost or sensor problem that needs diagnosis.
Related guides
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LG Refrigerator Ice Problems: Frost Build-Up, Ice Maker and Defrost
Frost building up in your LG freezer or the ice maker not working? Door seals and opening habits, defrost faults (dH), IF and IS codes, and safe checks.
Your LG Fridge in Jordan's Summer: 8 Tips for Better Cooling
Keep your LG fridge performing in heatwaves: ventilation, condenser, settings, loading and gaskets—and when weak cooling is a real fault.