Normal operating sounds. | GEAppliances.com |
These sounds are normal and are due mostly to highly efficient operation.
The new high efficiency compressor runs faster and will have a higher pitch hum or pulsating sound while operating.
The fans circulating air inside the freezer and refrigerator compartments which keep the temperatures uniform throughout.
The fans operating at a high speed. This happens when the refrigerator is first plugged in, when the doors are opened frequently, or when a large amount of food is added to the refrigerator or freezer compartments.
Water dropping on the defrost heater causing a sizzling, hissing or popping 
sound during the defrost cycle.
The flow of refrigerant through the freezer cooling coils sounds like boiling 
water or a gurgling noise.
Cracking or popping of cooling coils caused by expansion and contraction during defrost and refrigeration following defrost.
Water dripping as it melts from the evaporator and flows to the drain pan during the defrost cycle.
Icemaker (on some models)
The icemaker water valve will buzz when the icemaker fills with water. If the power switch is in the l (on) position it will buzz even if it has not yet been hooked up to water. Keeping the power switch in the l (on) position before it is hooked up to water can damage the icemaker. To prevent this, set the power switch to the O (off) position. This will stop the buzzing.
The sound of cubes dropping into the bin and water running in pipes as icemaker refills.
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