Occasional popping or cracking from a refrigerator is usually normal thermal expansion — metal, plastic and rubber parts expand and contract at different rates as temperatures change, often when the defrost heater switches on or off. It only becomes a concern when the popping is loud, constant, or comes with warm temperatures or other signs of a fault.
Why a fridge pops
Refrigerators are built from metals, plastics and rubber that expand and contract at different rates. Every temperature swing makes parts shift slightly, producing snaps and pops. If the fridge cools normally and the sounds are occasional, this is ordinary operation.
The defrost cycle
When the defrost heater switches on or off, internal parts change temperature quickly, which commonly triggers popping or cracking. It tends to be noticeable a few times a day and is not a fault.
After opening the door or changing the setting
| Situation | Why it pops |
|---|---|
| Door left open, then closed | Warm air enters and parts cool quickly |
| You change the temperature setting | Parts re-adjust to the new temperature |
| A large load of warm groceries goes in | Rapid cooling of internal surfaces |
Ice and ice-maker sounds
Ice dropping into the bin and the ice-maker cycling can sound like popping or clicking. If the sounds line up with ice production, that is normal. See our clicking noise guide if it is more of a click than a pop.
A part touching the cabinet
- Check the fridge is level and stable
An unlevel unit can let panels or lines rub or knock during expansion.
- Check nothing is touching the back or sides
A water or drain line, or the cabinet itself, resting against the wall can transmit popping sounds.
- Check items inside are not rattling
Loose shelves and bins can add pops of their own.
When popping is a warning sign
Loud, repeated or worsening popping accompanied by warm temperatures, a compressor that runs constantly, or unusual smells is worth taking seriously. Compare it with our buzzing noise guide and check cooling with a thermometer.
When to call a technician
If popping is loud or constant, or the fridge is not holding temperature, see our refrigerator troubleshooting guide and have a technician check the defrost system and compressor.
