Daikin RXQ12AHR Service Manual page 169

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