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164
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'16 • PAC-T-240
None
Excessive noise/vibration (2/3)
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1. Applicable model
5. Troubleshooting
All models
Diagnosis
Countermeasure
[Unit side]
Does noise/vibration
occur when the cooling/
heating operation is
performed
normally?
Are the pipes
contacting the
casing?
Is it heard
continuous hissing or
roaring sound?
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Are hissing sounds
heard at the startup or
stopping?
Is blowing sound
heard at the start/stop
of defrost operation
during heating?
Is cracking noise
heard during heating
operation?
Hissing noise is
heard during cooling
operation or after
stopping.
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
Rearrange the piping to
avoid contact with the
casing.
It is noise/vibration that
is generated when the
refrigerant gas or liquid
flow through inside of
piping of air-conditioner.
It is likely to occur
particularly during cooling
or defrosting in the heating
mode. It is normal.
The noise/vibration occurs
when the refrigerant starts
or stops flowing. It is
normal.
When the defrost operation
starts or stops during
heating, the refrigerant flow
is reversed due to switching
4-way valve. This causes
a large change in pressure
which produces a blowing
sound. It may accompany
also the hissing sounds as
mentioned above. They are
normal.
After the start or stop of
heating operation or during
defrost operation, abrupt
changes in temperature
cause resin parts to shrink
or expand. This is normal.
It is the sound produced
by the drain pump that
discharges drain from the
indoor unit. The pump
continues to run for 5
minutes after stopping the
cooling operation. This is
normal.
Apply the damper sealant
at places considered to
be the sources such as
the pressure reducing
mechanism (expansion
valve), capillary, etc.
2. Error detection method
3. Condition of error displayed
4. Presumable cause
Note:
Error code
Remote control:
LED
Green
Red
Indoor
Content
