A refrigerator makes some noise — that is completely normal. But when it starts humming loudly, rattling, buzzing, or clicking, it is worth understanding whether the sound is harmless or a sign of a developing fault. Here is how to diagnose every common refrigerator noise and what to do about it.
Quick Answer
Most refrigerator noises — humming, gurgling, clicking during defrost — are normal operation. Loud rattling is usually a loose drip tray or the fridge vibrating against a wall. Grinding or screeching sounds point to a fan motor that needs attention.
Normal Refrigerator Sounds
- Low steady hum: The compressor running — normal
- Gurgling or bubbling: Refrigerant circulating through coils — normal
- Clicking or popping: Plastic components expanding/contracting with temperature changes — normal
- Hissing during defrost: Water dripping on the defrost heater — normal
- Ice falling in the ice maker: A loud thud every few hours — normal
Abnormal Noises: Causes and Fixes
Loud Rattling or Vibrating
Cause: The fridge is not level, the drip tray underneath is loose, or it is touching the wall or cabinet.
Fix: Adjust the levelling feet so the fridge is slightly back-tilted (helps doors close). Pull the fridge away from the wall and neighbouring cabinets. Check and reseat the drip tray at the bottom.
Loud Humming (Louder Than Usual)
Cause: Dirty condenser coils force the compressor to work harder and run louder. Also common when the fridge is overstuffed.
Fix: Clean the condenser coils at the back/bottom. Remove excess items from the fridge. Ensure adequate ventilation gap.
Grinding or Screeching
Cause: The evaporator fan or condenser fan blade is hitting ice build-up or a foreign object (a dislodged wrapper, for example).
Fix: Unplug the fridge. Check the condenser fan at the back-bottom for obstructions. Manually defrost if ice is blocking the evaporator fan in the freezer. If the noise persists after defrost, the fan motor bearings are failing — replace the motor.
Knocking or Banging
Cause: The compressor is starting or stopping unevenly, often due to a failing start relay.
Fix: Remove the start relay (a small component plugged into the side of the compressor) and shake it — a rattling sound confirms it is faulty. A replacement relay costs ₹200–₹500 and is a simple plug-in swap.
Buzzing from Water Dispenser Area
Cause: The water inlet valve is trying to open but has low water pressure, or the supply line is kinked.
Fix: Check that the water supply valve behind the fridge is fully open. Check the filter — a clogged filter restricts flow and causes the valve solenoid to buzz. See: Refrigerator Water Dispenser Not Working.
Clicking Every Few Minutes
Cause: If the compressor tries to start, clicks, and then stops repeatedly, the overload protector is kicking in to protect the motor. This is a sign the compressor is overheating or the start capacitor has failed.
Fix: This requires a technician. Do not ignore repeated clicking — it can permanently damage the compressor.
Prevention Tips
- Clean condenser coils every 6 months
- Keep the fridge level and away from walls
- Do not overload shelves — allow airflow
- Check the drip tray annually
When to Call a Technician
- Repeated clicking (compressor failing to start)
- Grinding noise persists after defrost and obstruction check
- Loud banging accompanied by no cooling
If your refrigerator is aging and repairs are becoming frequent, it may be time to upgrade. You can sell your old refrigerator in Delhi to get value towards a new purchase.