Hitachi R-WB640PH1 Instruction Manual page 14

Troubleshooting
This is not a malfunction of the refrigerator:
Problem
Annoying sound is generated
by the refrigerator.
Operation sound lasts long.
Operation sound sometimes
becomes louder.
14
Things to check
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Instructions
● You may feel that the operation sound is loud because the
compressor operates in high-speed under the
following conditions: the refrigerator does not cool fully
on the occasion such as using it for the first time,
opening/closing the door frequently, the surrounding
temperature is high.
The sound becomes more quiet after cooling fully.
The compressor operates at low speed at night, or during
long vacations or absence.
●
It is because the compressor operates in low-speed for
conserving energy
● It is because the system changes the operating power of
the refrigerator according to the temperature change.
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