Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 167

SiBE341027
Troubleshooting
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check the detailed error
status in the monitor mode.
In Confirmation of
error 4, LED lamp
indicates as follows:
YES
Check if indoor unit PCB or
outdoor unit PCB has been
replaced. Or check if
indoor/outdoor, outdoor/ outdoor
connecting wires has been
modified.
NO
Do all the indoor remote
controllers within the
same refrigerant circuit
U4
display " "?
YES
Reset the power supply.
Does the normal
condition monitor for the
micro-computer (HAP)
on the outdoor unit PCB
blink?
YES
Does the LED in
NO
preparation mode (H2P) on
the outdoor unit PCB
blink?
YES
Lights do not go
out for 12
minutes or
more.
NO
Are the indoor/
outdoor, outdoor/
outdoor connecting
wires normal?
YES
Check if the operation is
normal with 1 circuit after
outdoor/outdoor connecting
wires are disconnected.
YES
NO
YES
Are the indoor/
NO
outdoor, outdoor/
outdoor connecting
wires normal?
NO
NO
Is the voltage between
R, S terminals on the
outdoor unit PCB
400V?
YES
Is the fuse on the
outdoor unit PCB
blown?
NO
YES
NO
NO
Troubleshooting by Remote Controller
Go on to the next page.
LED lamp display
( )
Press the RESET button on the
main PCB of the master outdoor
unit. Keep pressing for 5 seconds
or more. (Operation does not start
for a maximum 12 minutes.)
YES
Replace the indoor unit PCB.
Correct the connecting wires.
NO
Correct the voltage (400V).
YES
Replace the fuse.
Replace the outdoor unit PCB.
Press the RESET button on the
main PCB of the outdoor unit main
PCB. Keep pressing for 5 seconds
or more.
Correct the connecting wires.
Replace the outdoor unit main
PCB.
Install DIII-Net extension adaptor.
157