LG Refrigerator Error Code SYMPTOM‑NOT‑COOLING — How to Fix (Refrigerator Not Cooling) 2026

Introduction to SYMPTOM‑NOT‑COOLING

The LG Refrigerator error code SYMPTOM‑NOT‑COOLING indicates a problem with the refrigerator’s cooling system. This code can be caused by a variety of issues, including a faulty temperature sensor, a malfunctioning evaporator fan motor, or a problem with the defrost timer. In this guide, we’ll walk you through the steps to diagnose and fix the issue.

Understanding the Error Code

The SYMPTOM‑NOT‑COOLING code is usually accompanied by other symptoms, such as a warm interior temperature, a continuously running compressor, or a faulty evaporator fan motor. To fix the issue, you’ll need to identify the root cause of the problem and take the necessary steps to repair or replace the faulty component.

Step‑by‑Step Repair

1. Power‑Cycle the Unit (Quick Reset)

Unplug the fridge or shut off the dedicated breaker for at least 60 seconds. This clears any temporary fault in the main PCB. Re‑energize the unit and watch the display. If the error clears, you’ve solved a transient glitch. If not, continue.

2. Inspect Door Gaskets and Alignment

Open both doors and run your fingers along the rubber seal. Look for cracks, tears, or food particles. Close the doors and try to pull them away; a proper seal should resist removal. Replace any damaged gasket (part numbers vary by model; search “LG refrigerator door gasket” on Amazon). A good seal prevents warm air from entering and eliminates one of the most common causes of SYMPTOM‑NOT‑COOLING.

3. Clean the Condenser Coils

Locate the rear access panel (often held by two Phillips #2 screws). Remove the panel and use a vacuum with a brush attachment to clear dust, pet hair, and debris from the coils. A coil cleaning kit (search “condenser coil cleaning brush kit”) works well. Re‑install the panel. Clean coils restore efficient heat exchange, allowing the compressor to lower interior temperature properly.

4. Check the Evaporator Fan Motor

With the fridge unplugged, remove the freezer’s rear panel (usually secured with a T20 Torx). Spin the fan blade manually; it should rotate freely. Connect a digital multimeter across the motor terminals; a healthy fan reads between 4 Ω and 8 Ω. If the blade is stiff, the motor is seized, or the resistance is out of range, replace the motor. A working fan will emit a soft whirring sound once power is restored.

5. Test the Refrigerator Temperature Sensor

The sensor is a small black disc attached to the back wall of the fridge compartment. Disconnect the wiring harness, then measure resistance with the multimeter. Warm the sensor with your hand; resistance should drop smoothly (≈10 kΩ at 0 °C to ≈2 kΩ at 10 °C). Erratic or constant readings mean the sensor is bad. Replace it with a new LG‑compatible thermistor.

6. Verify the Defrost Timer or Control Board

Locate the defrost timer near the compressor (often a small rotary unit). Manually advance it with a flat screwdriver; you should hear a click and the evaporator fan should start. If the fan remains silent, the timer is stuck and must be replaced. For models with an electronic defrost controller, inspect the PCB for burnt pins or loose connectors. Replace only if visual damage is evident.

7. Examine the Main Control Board

If all mechanical components check out, the fault likely lies in the main PCB. With power off, remove the rear access panel and locate the board. Look for corrosion, cracked solder joints, or loose harnesses. Reseat all connectors and apply a thin layer of dielectric grease to the contacts. If the SYMPTOM‑NOT‑COOLING code persists, order a replacement board (search “LG refrigerator main control board” with your model number). Installing a new board is the final step and usually restores full cooling.

Repair Cost Estimate

*DIY cost includes part price plus a small allowance for tools or consumables. Professional labor averages $120‑$180 per hour; a full repair typically takes 2‑3 hours, so total shop‑price ranges from $300 to $600 depending on the part(s) needed.

Warranty & Support

LG offers a limited 1‑year parts and labor warranty on most new refrigerators, plus a 5‑year sealed‑system warranty for the compressor. If your unit is still under warranty, call LG Support at 1‑800‑243‑0000 before ordering parts. Have your model number and serial tag ready; the technician may guide you through a reset or arrange a service visit at no charge.

Preventive Maintenance Tips

• Clean condenser coils every 6‑12 months to keep heat exchange efficient.
• Check door seals quarterly; replace any gasket that shows wear.
• Run a weekly “defrost check.” If you notice frost building on the evaporator, manually defrost the freezer for a few hours and then run the fan to verify it spins.
• Keep the interior temperature set between 35‑38 °F for the fridge and 0‑5 °F for the freezer; extreme settings cause the compressor to cycle excessively, shortening component life.
• Avoid overloading the fridge. Too many items block airflow and can trigger the SYMPTOM‑NOT‑COOLING error.

Related Error Codes

If you encounter other LG refrigerator alerts, see the following pages for deeper dives:

• LG Refrigerator error Er FF – Evaporator fan motor fault.
• LG Refrigerator error Er FS – Freezer sensor malfunction.

For comparison, Samsung’s similar alert is documented here: Samsung Refrigerator error SYMPTOM‑NOT‑COOLING.

Frequently Asked Questions

Q: Can I reset the SYMPTOM‑NOT‑COOLING code without unplugging the fridge? A: Some LG models allow a soft reset via the control panel (press and hold the “Power Freeze” and “Power Cool” buttons for 5 seconds). However, a full power‑cycle is more reliable for clearing transient faults.

Q: My fridge still runs but stays warm after I replaced the fan. What next? A: Double‑check the temperature sensor wiring and resistance values. If the sensor checks out, the next likely culprit is the main control board.

Q: Is it safe to clean the condenser coils while the fridge is plugged in? A: No. Always disconnect power before removing the rear panel to avoid accidental contact with the compressor’s start relay.

Q: How do I know if the compressor itself is failing? A: A healthy compressor will start, run for a few minutes, then shut off as the thermostat reaches the set temperature. If it runs continuously, makes loud knocking noises, or never starts, it likely needs professional service.

Safety First

• Always disconnect power before opening panels.
• Use insulated tools and wear safety glasses.
• Never attempt to recharge refrigerant yourself; handling refrigerant requires EPA‑certified technicians.
• If you smell refrigerant, hear

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