Appliance guide
Some refrigerator sounds are completely normal. These are the ones worth investigating, and what each usually means.
Refrigerators are not silent appliances. Gurgling as refrigerant moves, occasional cracking as plastic parts expand and contract, and a soft hum from the compressor are all normal.
A few sounds are not, and identifying them early usually means a smaller repair.
Often the simplest fault of all — the fridge is touching a wall or a cabinet, or something is resting on top. Otherwise it is the compressor mounting rubbers hardening with age, or the condenser fan blade catching on dust build-up.
The relay attempting to start the compressor and cutting out on overload. Cooling will usually be poor at the same time. This is not a noise to live with — the repeated start attempts stress the compressor windings.
On frost-free models this is the evaporator fan, either with a worn bearing or with its blade striking ice that has formed after a defrost fault. It typically gets louder when the door is open and the fan keeps running on some models.
A compressor that never switches off and hums loudly is working harder than it should — commonly low gas, a choked condenser, a bad door seal or a thermostat that never satisfies. The noise is a symptom; the cooling circuit is the thing to check.
Normal in most cases. It becomes a concern only when combined with water pooling inside the cabin, which points to a blocked defrost drain rather than a noise problem.
A clicking relay, a grinding internal fan, or a compressor that hums without ever cutting off should be inspected. Each one gets worse and takes another component with it if left alone.
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