Daikin RXYQ-TA Series Service Manual page 177

SiUS341615E
Symptom
6 COOL/HEAT The remote controller displays
selection is UNDER CENTRALIZED
disabled. CONTROL.
The remote controller displays
UNDER CENTRALIZED
CONTROL, and the COOL/
HEAT selection remote
controller is provided.
7 The system This symptom occurs
conducts fan immediately after turning ON
operation but not the power supply.
cooling or
The remote controller displays
heating
UNDER CENTRALIZED
operation.
CONTROL; no cooling or
heating operation is performed.
Switch to fan operation.
8 The airflow rate Even pressing the airflow rate
is not setting button makes no
reproduced changes in the airflow rate.
according to the
setting.
9 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.
10 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.
<Indoor and outdoor units>
After the completion of defrost
operation, the system is
switched to heating operation.
Service Diagnosis
Supposed Cause
This remote controller has no option
to select cooling operation.
COOL/HEAT selection is made
using the COOL/HEAT selection
remote controller.
The system is in preparation mode
of operation.
In thermal storage operation, the
unit is set to fan operation in cooling
or heating operation, and the
remote controller shows
CENTRALIZED CONTROL.
In heating operation, when the room
temperature reaches the set
degree, the outdoor unit will stop
while the indoor unit is brought to
fan LL operation so that no one gets
cold air.
Furthermore, if fan operation mode
is selected when other indoor unit is
in heating operation, the system will
be brought to fan LL operation.
Automatic control
Uneven temperature distribution
due to heavy stain of the inside of
the indoor unit
Hot gas (refrigerant) that has flowed
in the indoor unit results to be vapor
from the unit.
Defrosted moisture turns to be
vapor and comes out from the units.
Symptom-based Troubleshooting
Countermeasure
Use a remote controller with option
to select cooling operation.
Use the COOL/HEAT selection
remote controller to select cool or
heat.
Wait for a period of approximately
10 minutes.
Normal operation.
Normal operation.
Normal operation.
Clean the inside of the indoor unit.
Normal operation.
Normal operation.
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