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LG refrigerator freezer not working: why it happens and what to check

Your LG may have lights, a working display, and a fan sound, while the freezer is still softening food. This page walks through the safe checks first, then shows what a technician tests when the LG refrigerator is not running or not cooling.

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Straight answer

An LG refrigerator freezer not working means the freezer is not reaching its set temperature, often with the fresh-food section warming too. After settings, Demo Mode, blocked vents, and dirty coils are ruled out, the most common failed system to suspect on a warm LG is the compressor or sealed system.

Check these first

Safe to do yourself. Unplug the appliance before you start.

  1. Confirm power at the outlet

    If the refrigerator has no lights, no display, and no fan sound, plug a lamp or phone charger into the same outlet. Reset the breaker if the outlet is dead, then give the refrigerator a few minutes to restart.

  2. Check Lock, settings, and Demo Mode

    Unlock the panel by holding the Lock button for 3 seconds if the controls won't respond. Set the refrigerator near 37°F and the freezer near 0°F, then check the manual for the Demo Mode button sequence because it varies by model.

  3. Use a real thermometer

    The LG display usually shows the set point, not the real air temperature inside the box. Put an appliance thermometer in the freezer and wait long enough for a stable reading before judging the repair.

  4. Clear the air vents

    Move bags, boxes, and tall containers away from the rear and upper vents in both compartments. Blocked vents can make one section warm even while the cooling system is trying to run.

  5. Check the door seals and frost

    Wipe the gaskets, then close each door on a sheet of paper and pull gently. If the paper slides out with almost no drag, that door may be leaking warm air; heavy frost on the rear freezer wall points more toward an airflow or defrost fault.

  6. Clean accessible coil dust

    Unplug the refrigerator and vacuum dust from the toe grille area or any coil area you can reach without removing a service cover. Dust and pet hair make the condenser shed heat poorly, so cooling can fade before a part fully fails.

When it's a repair

A technician will usually replace a failed evaporator fan or condenser fan when there is no airflow, then a thermistor or defrost sensor/heater if frost is blocking the evaporator, then the main PCB or inverter section if test mode and board checks point there. If the compressor vibrates but the copper lines never change temperature and both sections stay warm, the job moves into compressor or sealed-system work. On an older LG with a major sealed-system failure, repeated board failures, cabinet liner damage, or parts that are no longer available, replacement often makes more sense than repair.

Models where this shows up most

Many LG models use a rear main PCB test button with staged diagnostics. Some side-by-side models may skip the second test step, so the exact behavior depends on the model.

Worth knowing

Conditions that make this more likely

Lint and dust build up faster than you'd think

Dryer vents, refrigerator condenser coils and dishwasher filters collect lint, pet hair and dust. Homes with pets, long vent runs or dusty surroundings usually need these cleaned more than once a year.

Boards fail earlier in hot rooms

Electronics are rated for room temperature. In a garage or an unconditioned laundry room in summer, a control board can sit well above that for hours a day. Before replacing a board, a good technician confirms the parts it controls test good, since a shorted pump or valve can take out a new board too.

What a technician tests

Most likely part first. These are for a technician with a meter and the tech sheet, not a weekend project.

PartHow it's tested
Compressor and sealed systemIn PCB test mode stage 1, the compressor should run with a light vibration while the condenser fan runs. If the compressor is running but the copper lines stay near room temperature and the cabinet never cools, the tech checks charge, restriction, and compressor pumping rather than replacing small sensors first.
Evaporator fan motorDuring the first test-mode step, the tech checks for airflow at the freezer and fresh-food vents; some models stop the fan when a door is open, so the door switch has to be closed for the test. No airflow means a bad fan motor, a blocked fan blade, or a fan trapped in ice from a defrost problem.
Main PCB or power control boardFor a dead refrigerator, the tech checks for about 120 VAC at the board power input. If the board has proper incoming voltage but the refrigerator has no response, or the board LED blink pattern points to a drive fault, the main PCB or inverter section becomes suspect.
Power cordWith the refrigerator unplugged, the tech checks continuity from the cord plug to the board connector. A good conductor should read 0 ohms or show continuity; an open reading points to a failed cord or damaged connection.
Thermistors and defrost circuitThe tech checks the refrigerator and freezer sensor circuits at the board pins or at the sensor plugs, looking for an open, shorted, or fixed reading that doesn't change with temperature. In defrost test mode, the fans and compressor stop; if the evaporator is iced but the heater never warms, the heater, sensor, wiring, or board is tested next.

Don't see your symptom?

Describe it on the phone. The company on the other end works on these every day and will know what to ask.

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Common questions about appliance repair

Can I reset an LG refrigerator that is not working?

You can unplug it, wait a few minutes, then plug it back in. If it cools for a short time and warms up again, the reset did not fix the fault; it only restarted the controls.

Why are the lights on but the LG freezer is warm?

Lights and the display only prove the refrigerator has power. Demo Mode, a failed fan, a control fault, or a compressor/sealed-system problem can still leave the freezer warm.

Does the LG display show the real freezer temperature?

Usually it shows the temperature you set, not the actual temperature in the freezer. Use a separate thermometer, especially if ice cream is soft or ice production has slowed.

Should I keep trying parts if the compressor is running but it will not cool?

No. If both sections are warm, the compressor is vibrating, and the copper lines are not changing temperature, a technician should test the sealed system before any more small parts are replaced.

What if the refrigerator is under warranty?

Do not remove covers or replace parts before checking the warranty terms. Compressor and sealed-system coverage can differ from the rest of the refrigerator.

Still showing the problem after the checks?

Call and describe what you tried. You'll be connected with an independent repair company near you.

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