Hotpoint FZA81 - 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.
Expansion and contraction of parts inside the freezer can produce a
cracking noise as they rapidly change temperature.
The circulating fan in the freezer can make a whirring or buzzing sound
as it blows cold air around the compartment.
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OUBLESHOO
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