Daikin VRV X RXQ6-48ANR Series, Service Manual, Page: 247 / 297

SiME341909EA Troubleshooting by Error Code
Part 6 Service Diagnosis 241
Troubleshooting
Do all
indoor unit
remote controllers in
the same refrigerant
system display
U4 ?
Are the
indoor-outdoor and
outdoor-outdoor
transmission wirings
normal?
Fuse on the
outdoor unit main PCB
has blown out.
Does the
seven-segment display
show (1) or (2)?
( 1)
The lamp
does not turn OFF
for a period of 12 minutes
or more.
Are the
indoor-outdoor and
outdoor-outdoor transmission
wirings normal?
Is voltage
between L1 and N
terminals of the outdoor unit
PCB 380 to 415 V?
Does the
microcomputer
normal monitor indication
lamp (HAP) on the
outdoor unit main
PCB blink?
Has the
indoor or
outdoor unit PCB
been replaced, or has
the indoor-outdoor or
outdoor-outdoor
transmission
wiring been
modified?
Disconnect the
outdoor-outdoor
transmission wiring.
Does the system normally
operate with a single
transmission
line?
U4-01
1 :OFF :ON :BLINK
SEG1 SEG2 SEG3
(1)
(2)
Correct the voltage.
Replace the fuse.
Modify the transmission
wirings.
Press and hold RETURN
(BS3) on the outdoor unit
main PCB (A1P) for a period
of 5 seconds or more.
Replace the outdoor unit main
PCB (A1P).
Mount the DIII-NET extension
adaptor.
YES
NO
YES
YES
Replace the indoor unit PCB.
Press and hold RETURN
(BS3) on the master outdoor
unit main PCB (A1P) for a
period of 5 seconds or more.
(The system will not operate
for a period of 12 minutes at
maximum.)
Modify the transmission
wirings.
YES
Go to the next page.
U4-03
(Indoor unit system
transmission error)
NO
NO
NO
Replace the outdoor unit
main PCB (A1P).
NO
YES
NO
NO
NO
NO
NO
YES
NO
Reset the power supply once.
YES
YES
YES
Check for details of error in
monitor mode.
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.