Daikin VRV EMERION RXYQ-AATJA Service Manual page 234

Symptom-based Troubleshooting
Symptom
6 COOL/HEAT The remote controller displays
selection is CENTRAL CONTROL.
disabled.
The remote controller displays
CENTRAL 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 heating
The remote controller displays
operation.
CENTRAL CONTROL; no
cooling or heating operation is
performed. Switch to fan
operation.
8 The airflow rate is Even pressing the airflow rate
not reproduced setting button makes no
according to the changes in the airflow rate.
setting.
9 The airflow The airflow direction is not
direction is not corresponding to that displayed
reproduced on the remote controller.
according to the The flap does not swing.
setting.
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 indoor
air temperature and humidity
are low.
Indoor and outdoor units
After the completion of defrost
operation, the system is
switched to heating operation.
227
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 CENTRAL
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.
SiUS342303E
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.
Part 6 Service Diagnosis