Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 173

SiBE341027
Troubleshooting
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Diagnosis Flow 2
Confirmation of error 3 Confirmation of error 4
Cool/Heat selection
is unified.
YES
Setting of C/H SELECT
of the external control
adaptor for outdoor unit
is "MASTER".
NO
Setting of C/H SELECT
of the external control
adaptor for outdoor unit
is "SLAVE".
YES
Check if the normal
condition monitor
LED for the outdoor
unit main PCB
blinks.
YES
Check if the normal
condition monitor LED
for the external control
adaptor for outdoor unit
blinks.
YES
Set the C/H SELECT of the
external control adaptor for
outdoor unit to "IND". Then
check if the failure occurs
again.
YES
NO
YES
NO
NO
Check if power is
supplied to the
outdoor unit.
YES
Check if the power supply
NO
wire for the external
control adaptor for outdoor
unit is connected to 5V
supply line.
YES
NO
Troubleshooting by Remote Controller
C/H SELECT of the external
control adaptor for outdoor unit
is set to "IND".
The unified addresses for cool/
heat within the outdoor/outdoor
transmission are duplicated. Set
the address again.
Replace the outdoor unit main
PCB.
NO
Supply the power to the outdoor
unit.
Replace the outdoor unit main
PCB.
NO
Connect the power supply wire
for the external control adaptor
for outdoor unit to 5V supply
line.
Replace the PCB of the external
control adaptor for outdoor unit.
Replace the outdoor unit main
PCB.
163