SiBE12-908 Troubleshooting
Service Diagnosis 116
2.5 Air conditioner makes big noise and vibration.
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Piping length is too short
Mounting wall is too thin
Insufficient vibration prevention measures
Deformation of the unit
Improper quantity of refrigerant
Troubleshooting
(R9433)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Does the wall vibrate or
chatter?
YES
NO
Modify installation
conditions (reinforce the
wall, install outdoor rubber
cushion).
[Installation]
YES
Change installation place.
Put cushion material on the
installation plate.
Does the installation
plate vibrate or
chatter?
NO
Is the piping secured
and fixed?
[Unit]
YES
NO
NO
NO
Does the fan contact
with other parts?
Does the piping
contact with the
casing?
Is it passing sound
heard from the pressure
reducing valve?
· Overfilling of refrigerant
· Air mixed in
· Flushing sound due to refrigerant
shortage
NO
Secure it by using saddles
and inserting a cushion
material.
Correct them.
YES
YES
YES
Correct by hand, or install
piping weight.
Apply sound insulation
sheets of putty.
Conduct vacuum drying, fill
the refrigerant of specified
volume.
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