Hotpoint RZA50 - Manual (Page 17)

Troubleshooting
17
OPERATING SOUNDS OF A FREEZER
These are the normal types of sound that your freezer will make.
The motor (compressor) makes a buzzing or humming sound when it is
running. This can be louder when it first switches on. This sound will
reduce over the first few months.
Gases flowing through the pipes can produce gurgling, bubbling,
roaring or humming noises.
The temperature control can make a clicking noise when it turns the
motor on and off.
Expansion and contraction of parts inside the freezer can produce a
cracking noise as they rapidly change temperature.
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OUBLESHOO
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