Fridge Making Noise? Here's What Each Sound Means

Fridges are never completely silent, but certain noises can signal problems. Knowing the difference between normal fridge sounds and warning signs can save you from an expensive breakdown — or food spoilage at the worst possible time.

Normal Fridge Noises

Humming

A steady, low hum is the sound of the compressor running. This is completely normal. The compressor runs in cycles — turning on when the temperature rises and off when the target temperature is reached. A fridge that hums constantly may be working harder than it should (see below), but intermittent humming is healthy.

Clicking

A single click when the compressor starts or stops is normal. This is the thermostat or relay switch operating. If clicking is rapid and repetitive (more than one click every few seconds) without the compressor successfully starting, this is a problem — see below.

Gurgling or Bubbling

This is the sound of refrigerant flowing through the cooling coils. It's completely normal, especially after the compressor runs. Many people hear this more at night when the house is quiet.

Cracking or Popping

Plastic components inside the fridge expand and contract with temperature changes. Light cracking and popping sounds, especially after the door is opened and the temperature changes, are normal.

Warning Noises

Loud or Continuous Humming

If the fridge is humming louder than usual and running almost continuously without cycling off, it's working harder than it should. Common causes:

• Dirty condenser coils (at the back or bottom of the fridge) restricting heat dissipation
• Fridge placed too close to a wall or heat source
• Door seals letting warm air in
• Fridge overloaded with warm food

Fix: Clean the condenser coils (vacuum or brush), ensure 10cm clearance from walls, check door seals by putting a piece of paper in the door and seeing if it slides out easily when closed.

Rapid Clicking Without the Compressor Starting

This often indicates a faulty start relay — the small component that gives the compressor an electrical 'kick' to start. The relay tries repeatedly but fails.

Test: Remove the start relay (usually a small box plugged into the side of the compressor) and shake it. If you hear rattling, the relay has failed.

Fix: A start relay typically costs $15–40 and can be replaced yourself. This is a very common repair.

Buzzing or Vibrating

Intermittent buzzing often comes from the ice maker attempting to cycle (if equipped) or from the fridge vibrating against a wall or the floor being uneven. Check that the fridge is level and not touching walls at the back or sides.

Knocking or Banging

A knocking sound during compressor cycling can indicate worn compressor mounts or a compressor that's failing. If the knocking is accompanied by reduced cooling, this is a serious sign.

Diagnosis: If the fridge is old (over 12 years) and both noisy and not cooling, compressor replacement may cost more than the fridge is worth.

Fan Noises (Scraping, Grinding)

Fridges have one or two fans: the evaporator fan (inside, behind the rear panel) and the condenser fan (near the compressor). If either blade is hitting ice buildup or debris, you'll hear scraping. If the fan motor is failing, you'll hear grinding.

Fix: Defrost the fridge completely (evaporator fan icing is common in frost-free fridges when the defrost heater fails). Clear any debris from around the condenser fan.

When to Repair vs Replace

A fridge making noise but still cooling well is likely repairable with a minor fix. If noise is accompanied by poor cooling and the fridge is over 10 years old, replacement often makes more financial sense than a major repair.

Oceania Appliances stocks quality used fridges from $150, all tested and carrying a 3–6 month warranty. Free delivery across Sydney. Call 0481 243 211 or browse our online store.