Daikin RXYSQ4-5-6PA7V1B Service Manual page 137

Symptom-based Troubleshooting
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
heating
operation.
8 The airflow rate Even pressing the AIRFLOW
is not RATE SET 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
defrosting operation, the
system is switched to heating
operation.
126
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 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.
(The fan LL operation is also
enabled while in oil return mode in
cooling operation.)
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.
Defrosted moisture turns to be
vapor and comes out from the
units.
SiBE34-802
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.
Clean the inside of the indoor unit.
Normal operation.
Normal operation.
Troubleshooting