Nobu NBL4-12IDU32 User Manual page 110

Malfunction analysis
Phenomenon
● Whether there's odour source,
Odours are
emitted
Air conditio-
● Whether there's interference,
ner operates
abnormally
suddenly
"Water
● Air conditioner is turned on or
flowing"
noise
● Air conditioner is turned on or
Cracking
noise
Check items
such as furniture and cigarette,
etc.
such as thunder, wireless
devices, etc.
turned off just now?
turned off just now?
● Eliminate the odour source.
● Clean the filter.
● Disconnect power, put back
power, and then turn on the
unit again.
● The noise is the sound of
refrigerant flowing inside
the unit, which is a normal
phenomenon.
● This is the sound of friction
caused by expansion and/or
contraction of panel or other
parts due to the change of
temperature.
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Solution