Daikin RXYQ96PYDN Service Manual page 334

SiUS34-801A_b
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 System This symptom occurs
conducts fan immediately after turning ON
operation but not the power supply.
cooling or
heating
operation.
8 Airflow rate is not Even pressing the AIRFLOW
reproduced RATE SET button makes no
according to the changes in the airflow rate.
setting.
9 Airflow direction The airflow direction is not
is not corresponding to that
reproduced displayed on the remote
according to the controller.
setting. The louver does not swing.
10 A white mist <Indoor unit>
emits from the In cooling operation, the
system. ambient humidity is high.
(Indoor unit is installed in a
place with a lot of oil or dust.)
<Indoor unit>
Immediately after cooling
operation stops, the ambient
temperature and humidity are
low.
<Indoor and outdoor units>
After the completion of
defrosting operation, the
system is switched to heating
operation.
11 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 or defrosting
operation.
<Indoor and outdoor units>
"Hissing" sounds are
produced immediately after
the startup or stop of the
system, or the startup or stop
of defrosting operation.
Troubleshooting
Probable 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 setpoint
temperature, the outdoor unit will
stop while the indoor unit is brought
to fan LL operation so that cold air is
prevented.If fan operation mode is
selected when other indoor unit is in
heating operation, the system
reverts 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.
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 flow.
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.
Clean the inside of the indoor unit.
Normal operation.
Normal operation.
Normal operation.
This sound becomes low after a
lapse of approximately one minute.
Normal operation.
Normal operation.
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