---
title: LG Refrigerator Not Cooling? Troubleshooting Guide
url: https://911appliance.com/lg-refrigerator-not-cooling-troubleshooting-guide/
date: 2026-07-15T16:41:16+00:00
modified: 2026-08-14T06:27:12+00:00
lang: en_US
---

# LG Refrigerator Not Cooling? Troubleshooting Guide

An LG refrigerator that stops cooling is a urgent problem. Food safety gives you about 4 hours before perishables start to spoil, and LG refrigerators have some unique failure points that differ from other brands. LG uses linear compressors, dual-evaporator cooling systems, and digital inverter control boards, all of which can fail in ways that are specific to LG models.

At 911 Appliance Repair, we have been fixing LG refrigerators in San Diego for over 30 years. This guide covers the seven most common causes of cooling failure in LG refrigerators, in the order you should check them. If you would rather have a technician handle it, call us at **800-929-1192** for same-day LG refrigerator repair.

## Quick Checklist: LG Refrigerator Not Cooling

Before diving into individual causes, run through this 60-second checklist. It catches the simplest and most common problems:

- Is the display panel lit? If it is blank, the refrigerator may not be receiving power. Check the outlet and circuit breaker.
- Is Demo Mode active? Look for "OF F" on the display. Hold the Refrigerator and Ice Plus buttons together for 5 seconds to exit demo mode.
- Are the temperature settings correct? The refrigerator should be set to 37 degrees F and the freezer to 0 degrees F.
- Are the airflow vents between the freezer and refrigerator compartments blocked by food containers?
- Are the condenser coils clean? Check the back and bottom of the refrigerator for dust and pet hair.

If none of these solve the problem, work through the seven causes below.

## \1. Demo Mode (Exhibition Mode)

LG refrigerators have a Demo Mode, also called Exhibition Mode or Store Mode, designed for showroom display. It disables the compressor and cooling system while keeping the lights and display panel working so the refrigerator appears functional in a retail setting. This is the most common reason an LG refrigerator stops cooling, and it is not a malfunction.

Demo Mode can be activated accidentally by pressing the wrong button combination on the control panel, or by a power surge that resets the display.

**How to tell:** The display will show "OF F" or "0 F" instead of a temperature. The interior lights work, but the refrigerator and freezer are not cooling. The compressor will not be running.

**How to fix it:** The button combination varies by model. For most LG refrigerators, press and hold the **Refrigerator** and **Ice Plus** buttons simultaneously for 5 seconds until you hear a beep. On some models, hold the **Freezer** and **Ice Plus** buttons instead. On touch-screen models, look for "Ice Plus" and "Refrigerator" in the settings menu and press and hold both. The display will return to showing actual temperatures.

If the display does not show "OF F" and the refrigerator is still not cooling, move on to the next cause.

## \2. Evaporator Fan Motor Failure

The evaporator fan is located inside the freezer compartment behind the rear interior panel. It circulates cold air from the evaporator coils into both the freezer and refrigerator compartments. When this fan motor fails, the freezer may still get cold because it is directly adjacent to the coils, but the refrigerator compartment warms up because no cold air is being pushed into it.

This is one of the most common mechanical failures in LG refrigerators, particularly in French-door models with bottom freezers.

**How to tell:** Open the freezer door and press the door switch. You should hear a fan running. If you hear nothing, or if the fan makes a grinding or squealing noise, the motor is likely failing. Also check whether the back wall of the freezer feels cold but the refrigerator compartment is warm. That temperature split is a classic evaporator fan symptom.

**How to fix it:** The evaporator fan motor is located behind the rear interior panel of the freezer. To access it, remove the freezer shelves, the rear panel, and possibly the ice maker. If the fan blade is obstructed by ice, manually defrost the freezer first. If the blade spins freely by hand but the motor does not run when powered, the motor needs replacement.

This repair involves disassembling the freezer interior and working around the sealed system. We recommend a professional. A technician can replace the evaporator fan motor in under an hour.

## \3. Defrost System Failure

LG refrigerators use an automatic defrost cycle that melts frost off the evaporator coils every 8 to 12 hours. If any component in the defrost system fails, frost builds up on the coils until they are completely encased in ice. Cold air can no longer pass through the coils, and both the freezer and refrigerator lose cooling capacity.

This is a common failure in LG refrigerators that are 4 to 8 years old.

**How to tell:** Remove the rear interior panel of the freezer. If the evaporator coils are covered in a thick block of ice, the defrost system is not working. A light frost pattern is normal. A solid wall of ice is not.

Three components can cause this:

- **Defrost heater:** A glass or metal tube that warms the coils during the defrost cycle. If it burns out, ice accumulates. Test it with a multimeter for continuity. No continuity means it needs replacement.
- **Defrost thermostat (bimetal):** A small disc clipped to the evaporator coil that signals the heater to turn on and off. If it is stuck open, the heater never activates. Test it for continuity when cold (below 40 degrees F). No continuity when cold means it is bad.
- **Main control board:** On modern LG refrigerators, the main control board manages the defrost cycle electronically. If the board fails to send the defrost signal, ice builds up. This requires professional diagnosis.

**How to fix it:** A manual defrost (unplugging the refrigerator for 24 hours with the doors open) will temporarily restore cooling by melting the ice. But if the defrost system is not repaired, the ice will return within 1 to 2 weeks. The failed component needs to be identified and replaced. We recommend professional diagnosis because testing the control board requires specialized equipment.

## \4. Linear Compressor Failure

LG refrigerators use a linear compressor, which is different from the traditional rotary or reciprocating compressors used in most other brands. The linear compressor is designed to be quieter and more energy efficient, but it has been the subject of a class-action lawsuit and extended warranty program due to a higher-than-expected failure rate in certain LG refrigerator models manufactured between 2014 and 2017.

When the linear compressor fails, the refrigerator will not cool at all. You may hear a clicking sound every 2 to 3 minutes as the compressor attempts to start and fails.

**How to tell:** The display works and the lights are on, but you hear no compressor noise, or you hear a repeated clicking. The back of the refrigerator near the compressor will be at room temperature, not warm. If you have a model from 2014 to 2017, check whether your unit is covered under the extended linear compressor warranty.

**How to fix it:** This is not a DIY repair. The compressor is part of the sealed refrigerant system, and replacing it requires EPA-certified refrigerant recovery and recharge. If your refrigerator was manufactured between 2014 and 2017, contact LG to verify warranty coverage for the linear compressor. The extended warranty may cover the part and in some cases the labor. If your unit is out of warranty, we can provide a repair quote and help you weigh repair versus replacement.

## \5. Dirty Condenser Coils

The condenser coils release heat from the refrigerant as it circulates through the cooling system. On LG refrigerators, these coils are typically located on the back of the unit or underneath it behind a kickplate. When they get coated with dust, pet hair, and kitchen grease, they cannot release heat efficiently. The compressor works harder and longer, and eventually the refrigerator cannot maintain temperature.

**How to tell:** The refrigerator runs constantly but never reaches the set temperature. The sides or back of the unit may feel unusually warm. The compressor may be louder than normal.

**How to fix it:** Unplug the refrigerator, pull it away from the wall, and locate the condenser coils. Use a vacuum with a brush attachment or a coil cleaning brush to remove the dust. Be gentle with the fins. Clean the coils every 6 months to prevent recurrence.

Some newer LG models have enclosed condenser coils that are not user-accessible. If you cannot find exposed coils on the back or bottom, your model may have them sealed inside the cabinet. In that case, skip this step.

## \6. Damaged or Worn Door Seals

The rubber gaskets around the refrigerator and freezer doors create an airtight seal that keeps cold air in and warm air out. Over time, these gaskets can tear, flatten, or become brittle. Warm kitchen air leaks in and cold air leaks out. The compressor runs constantly to compensate but may not keep up.

**How to tell:** Close the door on a dollar bill. Pull the bill out. If it slides out with no resistance, the seal is weak in that spot. Repeat around the entire perimeter. You may also notice condensation on the inside of the door or food spoiling faster than usual.

**How to fix it:** First, clean the gaskets with warm soapy water. Dirt and grime can prevent a good seal. If cleaning does not help, the gasket needs replacement. Replacement gaskets are model-specific and can be ordered from LG or a parts supplier. Soak the new gasket in warm water before installation to make it pliable. The gasket presses into a retainer channel around the door on most LG models.

## \7. Main Control Board Failure

The main control board is the electronic brain of the LG refrigerator. It manages the compressor, fans, defrost cycle, ice maker, and temperature sensors. If the board fails, it may not send power to the compressor or fans, or it may send incorrect signals that cause erratic cooling behavior.

**How to tell:** This is the hardest cause to diagnose because the symptoms mimic other failures. The refrigerator may cool intermittently, the display may show error codes, or the compressor may run but not cool. Common LG error codes include ER FF (freezer fan error), ER CO (communication error between boards), and ER 1F (ice maker fan error).

**How to fix it:** The control board is located behind a panel on the back of the refrigerator. Before replacing it, a technician will check the temperature sensors, fan motors, and defrost components to rule out everything else. Control board replacement is a job for a professional because the board must be matched to your exact model number and the wiring connections are specific to each configuration.

## LG Refrigerator Error Codes to Watch For

If your LG refrigerator has a display panel, it may show an error code that points directly to the problem. Here are the most common codes related to cooling failures:

| Code | Meaning | Likely Cause |
| --- | --- | --- |
| ER FF | Freezer fan error | Evaporator fan motor failure |
| ER CO | Communication error between boards | Main control board or sub-board failure |
| ER 1F | Ice maker fan error | Ice maker fan motor or ice buildup |
| ER dH | Defrost heater error | Defrost heater or thermostat failure |
| ER rF | Refrigerator fan error | Refrigerator compartment fan motor failure |
| ER FS | Freezer sensor error | Temperature sensor failure |

If you see any of these codes, note it before calling for service. It helps the technician bring the right part on the first visit.

## When to Call a Professional

Some of these fixes are simple enough to do yourself: exiting demo mode, cleaning condenser coils, and replacing door gaskets. But anything involving the sealed refrigerant system, the control board, or disassembling the freezer interior is best left to a professional. Attempting these repairs without the right tools and training can cause further damage and void any remaining warranty coverage.

At 911 Appliance Repair, we have been repairing LG refrigerators in San Diego for over 30 years. We carry common LG replacement parts on our service vehicles, including evaporator fan motors, defrost heaters, defrost thermostats, and control boards, so most repairs are completed in a single visit. Our house call is $49.95, which is waived if you proceed with the repair, and all work is backed by a 1-year warranty on parts and labor.

Call **800-929-1192** to schedule same-day service, or visit our [LG appliance repair page](https://911appliance.com/lg-appliance-repair-san-diego/) for more information about the LG models we service.

## Frequently Asked Questions

### Why is my LG refrigerator running but not cooling?

The most common causes are Demo Mode being active (check for "OF F" on the display), a failed evaporator fan motor, or a defrost system failure causing ice buildup on the evaporator coils. If the compressor is not running at all, the linear compressor or main control board may have failed. Start by checking for Demo Mode, then listen for the evaporator fan in the freezer.

### How do I reset my LG refrigerator compressor?

To reset the compressor, unplug the refrigerator for 5 minutes, then plug it back in. This power cycle resets the control board and can resolve temporary glitches. If the compressor still does not start after the reset, the problem is mechanical, not a software issue. Do not attempt to reset the compressor by pressing buttons on the control panel, as this may activate Demo Mode instead.

### What is the first thing to check when an LG refrigerator stops cooling?

Check the display for "OF F," which indicates Demo Mode is active. This is the most common cause and the easiest to fix. If the display shows normal temperatures, check that the doors are closing fully and that nothing is blocking the airflow vents between the freezer and refrigerator compartments.

### What is the most common problem with LG refrigerators?

The linear compressor has been the most widely reported problem in LG refrigerators, particularly in models manufactured between 2014 and 2017. LG extended the warranty on the linear compressor for certain models due to a class-action settlement. Defrost system failures and evaporator fan motor failures are also common, especially in models that are 4 to 8 years old.

### Is it worth repairing an LG refrigerator that is not cooling?

In most cases, yes. The most common fixes (defrost heater, evaporator fan motor, thermostat) cost far less than replacing the refrigerator. If the linear compressor has failed and the unit is out of warranty, the repair cost may approach the value of the fridge, and replacement becomes the better option. We provide a free diagnosis and honest recommendation so you can make an informed decision. Time to upgrade? Our guide to the [best refrigerator brands of 2026](https://911appliance.com/2026s-most-reliable-refrigerator-brand-a-comprehensive-review/) can help you pick a model that lasts.