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The first split is which compartment failed. If my lg refrigerator is not cooling and the freezer is also warm, that is an lg refrigerator not cooling or freezing: both sections failed. A freezer that still holds 0°F with a warm fresh-food section is an airflow problem, and those two jobs do not share a fix. Read the model and serial on the tag inside the fresh-food compartment before you roll the cabinet out. A compressor you can hear is not a reason to open the sealed system.
LG has offered extra service coverage for specific linear-compressor serial ranges. An lg inverter linear refrigerator not cooling is not proof the compressor failed. Check that model and serial on LG's support site. Coverage applies only to the ranges LG lists there. Plenty of warm LG cabinets are dusty underneath, set too warm, or sealed poorly at the door.
Thermometer placement, gasket checks, and condenser clearance are shared with every brand. The full walk-through is in the guide to a refrigerator not cooling. Use that page for the common tests, then return here for the LG split. A Samsung refrigerator that is not cooling and a Whirlpool refrigerator that is not cooling follow different service notes, so do not borrow their steps for this badge.
Warm fridge, freezer still at 0°F
Put a thermometer in a glass of water on a middle shelf, and a second thermometer between frozen packages, not on the door. Leave both doors closed for several hours. The food-safety targets are a refrigerator at or below 40°F and a freezer at 0°F. Those figures come from the FDA's cold-food guidance.
If the freezer is truly at 0°F and the glass of water is above 40°F, cold air is not reaching the fresh-food section. Many LG models pause the evaporator fan when a door switch opens, so a silent fan with the door open can be normal. The manual for that model number tells you how to listen with the door shut. A solid frost sheet on the freezer's rear panel can choke the same path.
One manual defrost is only a test. Unplug the refrigerator, move the food to a cooler, leave the doors open, and lay towels on the floor for several hours. Do not chip ice and do not use a heat gun. If the frost returns after the cabinet cools again, stop and hire a qualified technician. Repeated frost means a defrost failure, not a gasket you can keep wiping.
Both compartments warm
When the whole cabinet is warm, the machine is not producing enough cold. Confirm the controls are not in a showroom or demo mode. LG does not use one button sequence on every model, so read the icon on the display and the key chart in the manual for that model number. A wrong sequence from a different LG can turn features off without telling you why the air is warm.
Then give the condenser room to shed heat. The manual shows whether the coils sit on the back or underneath and how much side clearance that model wants. Unplug the refrigerator and vacuum only the surface the manual exposes. Do not tip the cabinet alone, and do not open any panel that covers refrigerant lines. A click every few minutes, followed by silence and no cooling, is a stop sign, not a cue to pierce a tube.
What the two temperatures mean
| What you notice | Likely cause | Safe check |
|---|---|---|
| Fresh food above 40°F, freezer still near 0°F | Air path blocked by frost, a fan, or a damper | Thermometer in a glass of water; one defrost test if frost is visible |
| Both sections warm and the coils are dusty or boxed in | Condenser cannot reject heat | Unplug, clean only the coils the manual shows, restore the listed clearance |
| New delivery, both sections still warm | Cabinet still pulling down | Wait up to 24 hours with the doors closed |
| Dollar bill slides out of the door with no drag | Warm air leaking past the gasket | Clean the gasket; stop if it is torn and order the seal for that model |
| Serial falls in a range LG lists for extra coverage | Possible linear-compressor service case | Use the model and serial on LG's site and follow that service path |
| Frost returns within a few days of a full defrost | Defrost system, not a one-time ice block | Stop. Do not chip ice or add refrigerant |
Checks that stay outside the sealed system
Photograph the tag
Write down the model and serial from the fresh-food tag. You will need both for LG's site and for any technician. Confirm the characters against the manual so a worn digit does not send you to the wrong coverage page.
Set the targets and wait
Set the refrigerator at or below 40°F and the freezer at 0°F. Close the doors. A cabinet that was unplugged, overloaded with warm groceries, or just delivered needs hours, and a new one can take up to 24 hours. Measure after the wait, not after a minute of staring at the display.
Test the gasket
Close a dollar bill in the door at several spots. It should take a tug to slide free. Clean crumbs off the gasket and the strike face. A torn gasket is a parts order for that model number, not a piece of tape.
Clear the condenser the manual shows
Unplug first. Vacuum the coil face the guide identifies, pull the cabinet back out to the clearance that guide prints, and plug in again. Skip any cover that the manual does not tell you to remove.
Run one defrost only if you can see frost
If a frost sheet is blocking the freezer panel, do the unplug, empty, doors-open test once. Dry the floor as the ice melts. If cooling returns and then the frost sheet comes back, that test has done its job. Stop there.
Look up linear-compressor coverage
On LG's site, enter the model and serial. If they sit in a listed range, use LG's service path. If they do not, do not invent a compressor diagnosis. Other parts fail, and a technician has to test them with the sealed system left intact.
After the cabinet is cold again
Give the refrigerator several quiet hours and reread the glass of water. If a gasket cleaning or a coil vacuum was the whole fix, the temperatures should settle near the set points and stay there. If they climb again within a day or two, the earlier improvement was temporary. Use the serial check and schedule service instead of repeating the same cleaning.
More cabinet guides live in the refrigerator and freezer section. Coil and gasket care is collected under maintenance and cleaning. If the freezer side is the one that will not hold 0°F, the separate freezer not freezing guide covers upright and chest cabinets.
Questions readers ask
How long should a new LG refrigerator take to cool?
LG and other makers allow up to 24 hours for a new refrigerator to reach the set temperature. Leave both doors closed, keep the controls at or below 40°F in the fresh-food section and 0°F in the freezer, and measure with a thermometer rather than the door skin. If the cabinet is still warm after a full day, move on to airflow and the serial-number check.
Does a warm LG always mean the linear compressor failed?
No. LG has offered extra service coverage for specific linear-compressor serial ranges, and many warm cabinets fall outside those ranges. An inverter linear model can also run warm because of dust, a poor door seal, a demo setting named in that manual, or a frost block. Look up the model and serial on LG's site before you decide the compressor is the cause.
Why is the refrigerator warm when the freezer still feels cold?
Cold air is made in the freezer and has to reach the fresh-food section. A frost sheet on the back panel, a fan that is not moving, or a door left ajar will warm the fridge while the freezer still feels cold. Confirm the freezer is actually near 0°F with a thermometer. One careful defrost is only a test. If the frost returns, stop.
Can I add refrigerant to an LG refrigerator myself?
No. The sealed system is not a homeowner repair. Adding refrigerant, piercing a line, or opening the compressor compartment can ruin the cabinet and is unsafe. If temperatures stay high after the airflow, gasket, and setup checks, hire a qualified technician. If the serial is in a published coverage range, start with LG's support path for that model.
Where do I find the model and serial on an LG refrigerator?
On most LG refrigerators the tag is on an interior wall of the fresh-food section, often near the top or along the side. Some models also repeat it on a frame edge behind the door. Match both numbers to the label in the manual. Use those exact characters on LG's support site when you check service coverage. A photo of the tag saves a second trip behind the cabinet.