Daikin RXYQ96PYDN Service Manual page 335

Symptom-based Troubleshooting
Symptom
<Indoor unit>
Faint sounds are continuously
produced while in cooling
operation or after stopping the
operation.
<Indoor unit>
"Creaking" sounds are
produced while in heating
operation or after stopping the
operation.
<Indoor unit>
Sounds like "trickling" are
produced from indoor units in
the stopped state.
<Outdoor unit>
Pitch of operating sounds
changes.
12 Dust emits from Dust comes out from the
the system. system when it restarts after
the stop for an extended
period of time.
13 Odors emit from In operation
the system.
14 Outdoor unit fan In operation
does not rotate.
15 LCD display [88] Immediately after turning ON
appears on the the power supply
remote
controller.
16 The outdoor unit After stopping operation
compressor or
the outdoor unit
fan does not
stop.
17 The outdoor unit While stopping operation
gets hot.
18 Hot air emits Hot air is felt while the system
from the system stops.
even though it
stops.
19 The system does The system is in dry
not cool air well. operation.
320
Probable Cause
These sounds are produced from
the drain discharge device in
operation.
These sounds are produced from
resin parts expanding and
contracting with temperature
changes.
With VRV systems, these sounds
are produced when other indoor
units are 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.
Accumulated dust deposits are
emitted from the system.
Odors in a room are absorbed into
indoor unit and then blown out.
Fan revolutions are controlled for
optimum performance.
System is checking if remote
controller is normal.
It continues to prevent oil or
refrigerant from accumulating.
The reason is that the compressor
is warmed up to provide smooth
startup of the system.
With VRV systems, a small quantity
of refrigerant is fed to indoor units in
the stopped state when other indoor
units are in operation.
Dry operation does not reduce
room temperature.
SiUS34-801A_b
Countermeasure
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 one
minute maximum.
Normal operation.
It stops after a lapse of
approximately 5 to 10 minutes.
Normal operation.
Normal operation.
Change the system to cooling
operation.
Troubleshooting