Daikin VRV RXYQ72-384XAYCA Service Manual page 218

Symptom-based Troubleshooting
Symptom
11 The system Indoor unit
produces sounds. Immediately after turning ON
the power supply, indoor unit
produces ringing sounds.
Indoor and outdoor units
Hissing sounds are
continuously produced while in
cooling or defrost operation.
Indoor and outdoor units
Hissing sounds are produced
immediately after the startup or
stop of the system, or the
startup or stop of defrost
operation.
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 or the like
are produced from indoor units
in the stopped state.
Outdoor unit
Pitch of operating sounds
changes.
12 Dust comes out Dust comes out from the
from the system. system when it restarts after
the stop for an extended period
of time.
13 Odors come out In operation
from the system.
14 Outdoor fan does In operation
not rotate.
15 LCD display 88 or Immediately after turning ON
Checking the the power supply
connection.
Please stand by.
appears on the
remote controller.
16 The outdoor unit After stopping operation
compressor or
the outdoor fan
does not stop.
17 The outdoor gets While stopping operation
hot.
18 Hot air comes out Hot air is felt while the system
from the system stops.
even though it
stops.
211
Supposed Cause
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
flowing.
These sounds are produced from the
drain discharge device in operation.
These sounds are produced from
resin parts expanding and
contracting with temperature
changes.
On VRV systems, these sounds are
produced when other indoor units 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.
Dust, which has deposited on the
inside of indoor unit, is blown out
from the system.
Odors of room, cigarettes or else
adsorbed to the inside of indoor unit
are blown out.
The reason is that fan revolutions are
controlled to put the operation to the
optimum state.
The reason is that the system is
checking to be sure the remote
controller is normal.
It stops in order to prevent oil or
refrigerant from dwelling.
The reason is that the compressor is
warmed up to provide smooth startup
of the system.
On VRV systems, small quantity of
refrigerant is fed to indoor units in the
stopped state when other indoor units
are in operation.
SiUS342004EB
Countermeasure
Normal operation.
This sound becomes low after a
lapse of approximately one minute.
Normal operation.
Normal operation.
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 a period of
approximately one minute at
maximum.
Normal operation.
It stops after a lapse of approximately
5 to 10 minutes.
Normal operation.
Normal operation.
Part 6 Service Diagnosis