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SiUS28-902_B
Symptom-based Troubleshooting
Service Diagnosis
75
11 The system
produces
sounds.
<Indoor unit>
Immediately after turning ON
the power supply, indoor unit
produces "ringing" sounds.
Operating sounds of the
electronic expansion valve of the
indoor unit.
Normal operation.
This sound lowers after
approximately 1 minute.
<Indoor and outdoor units>
"Hissing" sounds are
continuously produced while in
cooling or defrosting operation.
Gas (refrigerant) is flowing
respectively through the indoor
and outdoor units.
Normal operation.
<Indoor and outdoor units>
"Hissing" sounds are produced
immediately after the startup or
stop of the system, or the
startup or stop of defrosting
operation.
Gas (refrigerant) stops or
changes direction of flow.
Normal operation.
<Indoor unit>
Faint sounds are continuously
produced while in cooling
operation or after stopping the
operation.
The drain discharge device is in
operation.
Normal operation.
<Indoor unit>
"Creaking" sounds are
produced while in heating
operation or after stopping the
operation.
Resin parts are expanding and
contracting with temperature
changes.
Normal operation.
<Outdoor unit>
Pitch of operating sounds
changes.
The compressor changes the
operating frequency.
Normal operation.
12 The system
emits dust.
The system emits dust after
being stopped and then
restarted after an extended
time.
Dust, which has deposited on the
inside of indoor unit, is blown out
from the system.
Normal operation.
13 The system
emits odors.
In operation
Cigarette or other room odors
have been adsorbed into the
system and are emitted upon
starting operation.
The inside of the indoor unit
should be cleaned.
14 Outdoor unit fan
does not rotate.
In operation
Fan revolutions are controlled to
put the operation to the optimum
state.
Normal operation.
15 LCD display "
88
"
appears on the
remote
controller.
Immediately after turning ON
the power supply
The system is checking to be sure
the remote controller is normal.
Normal operation.
This code is displayed for a period
of approximately one minute at
maximum.
16 The outdoor unit
compressor or
the outdoor unit
fan does not
stop.
After stopping operation
Stops in order to prevent oil or
refrigerant from dwelling.
Normal operation.
It stops after a lapse of
approximately 5 to 10 minutes.
17 The outdoor unit
gets hot.
While stopping operation
Compressor is warmed up to
provide smooth startup of the
system.
Normal operation.
18 The system does
not cool air well.
The system is in dry operation. Dry operation serves not to
reduce the room temperature
where possible.
Change the system to cooling
operation.
Symptom
Supposed Cause
Countermeasure