Fridge Not Cooling? Here's How to Diagnose the Problem

A fridge that's not cooling properly is a food safety emergency. Food in a fridge that's above 5°C for more than 2 hours is at risk. Here's how to quickly diagnose what's wrong and decide whether to repair or replace.

Step 1: Check the Basics

Is it plugged in? Sounds obvious, but check the power point and make sure the socket is working. Is the thermostat set correctly? The fridge thermostat may have been accidentally turned to its warmest setting. Turn it to the middle or recommended setting (3–4°C). Is the door closing properly? A partially open door or damaged door seal will let warm air in constantly.

Step 2: Check the Door Seal

Close the door on a piece of paper. If the paper slides out easily, the seal is not creating a good vacuum. A damaged or loose seal needs replacing — a relatively inexpensive repair that can be done as a DIY job or by a technician.

Step 3: Check for Ice Build-Up

Open the freezer compartment. Is there excessive ice build-up on the back wall or around the evaporator area? Heavy ice build-up means the defrost system isn't working properly. The ice blocks airflow from the freezer to the fridge, causing the fridge to warm up while the freezer may be very cold.

Temporary fix: Manually defrost the freezer (unplug, remove all food, leave door open for several hours). If the problem returns within a week or two, the defrost heater, timer or thermostat needs replacement by a technician.

Step 4: Check the Condenser Coils

Dusty condenser coils (on the back or underneath the fridge) can't release heat efficiently. This makes the fridge work harder and cool less effectively. Vacuum or brush the coils to clean them. This alone sometimes restores normal cooling.

Step 5: Listen to the Compressor

Can you hear the motor running? Put your ear near the bottom back of the fridge. A healthy fridge hums consistently. If you hear nothing, clicking sounds, or the motor starts and immediately stops, the compressor or start relay may be faulty. No noise = likely compressor issue.

Step 6: Check the Evaporator Fan

Open the fridge and listen for a fan running inside. This fan circulates cold air. If the fan has failed, cold air won't circulate properly and parts of the fridge will be warm while others are cold. This is a technician repair.

When to Replace vs Repair

Simple fixes: door seal, thermostat, defrost system — generally worth repairing. Expensive fixes: compressor, evaporator, control board — get a repair quote and compare to a replacement refurbished fridge. If repair costs exceed 50% of a replacement fridge cost, replacement is usually smarter.

Oceania Appliances sells tested, refurbished fridges from $199 with warranty. Free delivery across Sydney. Call 0481 243 211 or visit 2/14 Centre Place, Wetherill Park.