Why Does My Fridge Make Noise? Common Sounds Explained
Fridges are never completely silent — and most sounds are completely normal. But some sounds can indicate a problem that needs attention. This guide explains what each sound means and when you should be concerned.
Normal Fridge Sounds
Humming or Low Buzzing
A steady, low-pitched hum is the sound of your compressor running. This is normal. Modern inverter compressors run at variable speeds, so the hum may change in pitch throughout the day. If the humming is very loud or has suddenly become louder than it used to be, the compressor may be working harder than it should (possibly due to dirty condenser coils or a failing component).
Clicking
Clicking sounds when the fridge starts or stops are completely normal — this is the thermostat or relay switch turning the compressor on and off. A single click every few minutes to hours is perfectly normal. Rapid repeated clicking (every few seconds) can indicate the compressor is struggling to start and may need attention.
Gurgling or Bubbling
A gurgling or bubbling sound (similar to water draining) is the refrigerant moving through the cooling system. This is completely normal and may be more noticeable after the compressor stops running. Some people describe it as a "bubbling pipe" sound. No cause for concern.
Cracking or Popping
Cracking or popping sounds, particularly when the temperature changes, are caused by the plastic components inside the fridge expanding and contracting as temperatures shift. This is completely normal, particularly after the compressor turns off and temperatures begin to stabilise.
Water Running Sound
Many modern frost-free fridges run a defrost cycle automatically every 8–12 hours. During this cycle, you may hear a hissing sound as ice melts off the evaporator coils, followed by water dripping. This is completely normal. You may also hear the fan running during this period.
Sounds That May Indicate a Problem
Loud Grinding or Rattling
A grinding or rattling sound that wasn't there before can indicate a problem with the evaporator fan motor (the fan inside the freezer compartment). If the fan blade hits ice build-up, it will rattle or grind. Check if ice is obstructing the fan. If you have a frost-free fridge that is experiencing unusual ice build-up, the auto-defrost system may have failed.
Vibrating or Buzzing from the Back
Excessive vibration from the back of the fridge can indicate the condenser coils or compressor mounting bolts have loosened. Check that the fridge is level and that nothing on top of or touching the fridge is vibrating with it. Sometimes this is as simple as repositioning the drip tray.
No Sound at All
If your fridge is completely silent and food is not staying cold, the compressor may have failed. Check that the fridge is plugged in and the circuit breaker hasn't tripped. If power is confirmed but the compressor is not running, call a service technician.
Fridge Noise Troubleshooting
| Sound | Likely Cause | Action |
|---|---|---|
| Steady hum | Normal compressor | None required |
| Clicking (occasional) | Normal thermostat cycling | None required |
| Gurgling/bubbling | Normal refrigerant flow | None required |
| Cracking/popping | Normal thermal expansion | None required |
| Loud grinding/rattle | Fan blade/ice obstruction | Check fan; call service |
| Persistent rapid clicking | Compressor struggling to start | Call service technician |
| Hissing (not defrost cycle) | Possible refrigerant leak | Call service technician |
When to Replace Your Fridge
If your fridge is over 10 years old and making unusual sounds, the cost of repair may exceed the value of the appliance. Oceania Appliances stocks a wide range of refrigerators to suit every budget. Contact us at support@oceaniaappliances.com.au or visit our Wetherill Park showroom. Open 7 days 10am–8pm.