Specifications

SiBE04-624 Troubleshooting
Service Diagnosis 147
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
Modify installation
conditions (reinforce the
wall, install outdoor rubber
cushion).
Change installation place.
Put cushion material on the
installation plate.
Secure it by using saddles
and inserting a cushion
material.
Correct them.
Correct by hand, or install
piping weight.
Apply sound insulation
sheets of putty.
Conduct vacuum drying, fill
the refrigerant of specified
volume
Does the
wall vibrate or chatter?
(R3403)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Does the
installation plate vibrate or
chatter?
· Overfilling of refrigerant
· Air mixed in
· Flushing sound due to refrigerant
shortage
Is the piping secured
and fixed?
NO
YES
YES
YES
YES
NO
NO
YES
NO
[Unit]
[Installation]
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?
YES