LG Freezer Not Freezing – Causes & Fixes
1. Temperature Settings Are Incorrect
An accidental bump to the control panel or a power fluctuation can reset your LG freezer’s temperature to a setting that is too warm. LG recommends a freezer temperature of 0 °F (−18 °C) for safe food storage.
- Press the Freezer button on the control panel and confirm the display reads 0 °F (−18 °C) or lower.
- If the display shows a warmer setting, press the button repeatedly until the correct temperature appears.
- Allow 24 hours for the compartment to stabilize before re-evaluating.
- Make sure the Sabbath mode or Demo mode is not active — consult your model’s manual on LG’s official support page to disable it.
2. Dirty or Blocked Condenser Coils
Condenser coils release heat from the refrigerant; when they are clogged with dust and debris, the freezer cannot reach the target temperature. Most LG freezer coils are located at the bottom rear of the unit and should be cleaned every 6–12 months.
- Unplug the freezer from the wall outlet.
- Pull the unit away from the wall and locate the condenser coils at the back or bottom.
- Use a vacuum with a brush attachment or a condenser coil brush to remove dust and debris.
- Replace the grille or access panel, push the freezer back, and plug it in.
- Wait 24 hours and check whether temperatures have improved.
3. Evaporator Fan Motor Has Failed
The evaporator fan circulates cold air throughout the freezer compartment; if it stops running, you will notice the freezer warming even though the compressor is still operating. Listen for the fan — if you hear no airflow sound when the door is closed, the motor may be at fault.
- Unplug the freezer.
- Remove the interior back panel of the freezer compartment to access the evaporator fan.
- Spin the fan blade by hand — if it does not spin freely, the motor bearings may be seized.
- Use a multimeter to test the fan motor for continuity. No continuity confirms a failed motor.
- Replace the motor if it fails the continuity test.
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4. Defrost System Malfunction (Frost Build-Up on Evaporator Coils)
LG freezers use an automatic defrost system; if the defrost heater, defrost thermostat, or defrost timer/control board fails, ice accumulates on the evaporator coils and blocks airflow, causing the freezer to stop freezing. A thick layer of frost on the back interior wall is the telltale sign.
- Unplug the freezer and remove the interior back panel to inspect the evaporator coils.
- If the coils are encased in ice, perform a manual defrost: leave the freezer off with the door open (with towels on the floor) for 24–48 hours.
- After defrosting, plug the unit back in and monitor it. If frost returns within a day or two, a component in the defrost system has failed.
- Test the defrost heater with a multimeter for continuity. Replace it if there is none.
- Test the defrost thermostat at room temperature — it should show continuity when cold and open when warm.
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5. Faulty Compressor Start Relay
The start relay gives the compressor the jolt it needs to start a cooling cycle; a burned-out relay means the compressor never kicks on, so the lg freezer not freezing problem persists even though everything else appears fine. This small, inexpensive part is one of the most common compressor-related failures.
- Unplug the freezer.
- Locate the compressor at the bottom rear of the unit and remove the start relay from its side (it pulls straight off).
- Shake the relay near your ear — a rattling sound indicates a burned-out internal component.
- Test for continuity between the relay’s terminals using a multimeter. No continuity means it needs replacement.
- Snap in the new relay, reposition the access panel, and plug the freezer back in.
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6. Failed Thermistor (Temperature Sensor)
The thermistor monitors freezer temperature and sends readings to the control board; if it fails, the board cannot regulate the cooling cycle correctly, causing the freezer to run too warm or not at all. This is a common root cause that is often overlooked.
- Unplug the freezer.
- Locate the thermistor — it is typically clipped to the evaporator coils behind the interior back panel.
- Disconnect the thermistor and test its resistance with a multimeter. Compare the reading to the specification in your model’s service manual (resistance should decrease as temperature decreases).
- If the resistance reading is out of range or shows no continuity, replace the thermistor.
- Reassemble, plug in the unit, and allow 24 hours for temperatures to stabilize.
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Frequently asked questions
How long should I wait after adjusting the temperature before the LG freezer starts freezing properly?
Allow at least 24 hours after changing the temperature setting or completing a repair before judging whether the freezer is working correctly. A heavily loaded freezer or one that was recently defrosted may take up to 48 hours to reach the target temperature of 0 °F (−18 °C).
Why is my LG freezer running but not freezing?
If the compressor is running (you can hear and feel it humming) but the freezer is not cold enough, the most likely culprits are frosted-over evaporator coils blocking airflow, a failed evaporator fan motor, a bad thermistor sending incorrect readings to the control board, or dirty condenser coils preventing proper heat dissipation.
Can a faulty door seal cause an lg freezer not freezing?
Yes. A worn or torn door gasket lets warm, humid air into the freezer compartment continuously. This forces the compressor to work harder, raises the internal temperature, and can lead to rapid frost build-up on the evaporator coils. Inspect the seal by closing the door on a piece of paper — if it slides out easily, the gasket needs replacement.
Is a compressor replacement worth it on an LG freezer?
A compressor is the most expensive repair on any freezer. If your unit is less than 5–7 years old and still under warranty, replacement is usually worthwhile. For older units, compare the repair cost against the price of a new appliance. LG has also been involved in class-action settlements related to linear compressor failures, so check whether your model qualifies for coverage before paying out of pocket.