SiAF341904E
Symptom-based Troubleshooting
Part 6 Service Diagnosis
163
7
The airflow
direction is not
reproduced
according to the
setting.
The airflow direction is not
corresponding to that
displayed on the remote
controller.
The flap does not swing.
Automatic control
Normal operation.
8
A white mist
comes out from
the system.
Indoor unit
In cooling operation, the
ambient humidity is high.
(This indoor unit is installed in
a place with much oil or dust.)
Uneven temperature distribution
due to heavy stain of the inside of
the indoor unit
Clean the inside of the indoor unit.
Indoor unit
Immediately after cooling
operation stopping, the
ambient temperature and
humidity are low.
Hot gas (refrigerant) flown in the
indoor unit results to be vapor from
the unit.
Normal operation.
9
The system
produces
sounds.
Indoor unit
Immediately after turning ON
the power supply, indoor unit
produces ringing sounds.
These are operating sounds of the
electronic expansion valve of the
indoor unit.
Normal operation.
This sound becomes low after a
lapse of approximately one minute.
Indoor and outdoor units
Hissing sounds are
continuously produced while
in cooling operation.
These sounds are produced from
gas (refrigerant) 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.
These sounds are produced when
the gas (refrigerant) stops or
changes flowing.
Normal operation.
Indoor unit
Faint sounds are continuously
produced while in cooling
operation or after stopping the
operation.
These sounds are produced from
the drain discharge device in
operation.
Normal operation.
Indoor unit
Creaking sounds are
produced after stopping the
operation.
These sounds are produced from
resin parts expanding and
contracting with temperature
changes.
Normal operation.
Indoor unit
Sounds like trickling or the like
are produced from indoor
units in the stopped state.
On
VRV
systems, these sounds are
produced when other indoor units in
operation. The reason is that the
system runs in order to prevent oil
or refrigerant from dwelling.
Normal operation.
Outdoor unit
Pitch of operating sounds
changes.
The reason is that the compressor
changes the operating frequency.
Normal operation.
10
Dust comes out
from the system.
Dust comes out from the
system when it restarts after
the stop for an extended
period of time.
Dust, which has deposited on the
inside of indoor unit, is blown out
from the system.
Normal operation.
11
Odors come out
from the system.
In operation
Odors of room, cigarettes or else
adsorbed to the inside of indoor unit
are blown out.
The inside of the indoor unit should
be cleaned.
12
Outdoor unit fan
does not rotate.
In operation
The reason is that fan revolutions
are controlled to put the operation to
the optimum state.
Normal operation.
13
LCD display
88
appears on the
remote controller.
Immediately after turning ON
the power supply
The reason is that 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.
14
The outdoor unit
compressor or
the outdoor unit
fan does not
stop.
After stopping operation
It stops in order to prevent oil or
refrigerant from dwelling.
Normal operation.
It stops after a lapse of
approximately 5 to 10 minutes.
15
The outdoor gets
hot.
While stopping operation
The reason is that the compressor
is warmed up to provide smooth
startup of the system.
Normal operation.
16
The system does
not cool air well.
The system is in dry
operation.
The reason is that the dry operation
serves not to reduce the room
temperature where possible.
Change the system to cooling
operation.
Symptom
Supposed Cause
Countermeasure
