LG Refrigerator Not Cooling: 5 Common Causes

An LG refrigerator that’s running but not cooling is one of the most common calls we get across Dublin, Pleasanton, and the surrounding area. Before you assume the compressor is dead, run through these five causes — the first two take less than fifteen minutes to check.

1. Dirty Condenser Coils

This is the #1 cause we find on service calls. LG refrigerators — especially models with the linear compressor — lose cooling fast when the condenser coils are caked with dust and pet hair. The coils sit underneath the fridge or on the back panel. Unplug the fridge first, then vacuum the coils with a brush attachment (a $10 coil brush from the hardware store reaches everywhere). Plug it back in and give it a few hours — if cooling returns, that was it.

2. Blocked Air Vents Inside

Cold air travels from the freezer into the fridge section through vents on the back wall. When food is packed tight against those vents, airflow stops and the fridge section warms up while the freezer seems fine. Rearrange items away from the vents and make sure nothing is blocking them. This one fixes a surprising number of “not cooling” complaints.

3. Failed Evaporator Fan Motor

The classic symptom: freezer is cold, fridge is warm, and you feel little or no air moving inside. The evaporator fan circulates cold air — when its motor dies, cooling stays trapped in the freezer. Sometimes you’ll hear squealing or chirping in the days before it quits. Replacing the fan means removing interior panels and handling wiring, so this is usually a pro job.

4. Faulty Start Relay or Compressor Problem

LG’s linear compressors are a known weak point. Warning signs: a clicking sound every few minutes with no cooling, or a compressor that’s hot to the touch but not running. The start relay (a small, cheap part) fails far more often than the compressor itself — but telling the two apart takes testing, not guessing. Anything involving the compressor or refrigerant is sealed-system work, which legally requires EPA certification and special equipment.

5. Damper Control or Main Board Failure

If the settings look right but the temperatures are wrong, suspect the controls. A motorized damper door regulates cold air flowing from the freezer to the fridge — when it sticks closed, the fridge warms up. On electronic models, the main control board can also fail to cycle the compressor properly. Diagnosing either one takes a multimeter and the model’s service specs; swapping parts blindly gets expensive fast.

When to Call a Professional

If the coils are clean, the vents are clear, and the fridge still isn’t cooling after several hours, stop troubleshooting. Compressor, relay, sealed-system, and board problems all need proper testing — and sealed-system work isn’t a DIY job. A tech can pinpoint the failed part in a single visit instead of an expensive guessing game.

Smart Repair fixes Samsung, LG, Whirlpool, GE, and most other brands across Dublin, Pleasanton, San Ramon, Livermore, Fremont, Hayward, and nearby cities. The diagnostic visit is $80 — book online or call (510) 283-8087.