Daikin VRV EMERION RXYQ-AATJA Service Manual page 353

SiUS342303E
Troubleshooting
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check for details of error in
monitor mode.
U4-01
YES
Check the power supply wiring.
Any
open phase in
the power supply wiring
or any wrong wiring of the
outdoor unit?
NO
Has the
indoor or
outdoor unit main
PCB been replaced, or
has the indoor-outdoor or
outdoor-outdoor
transmission
wiring been
modified?
NO
Do all
indoor unit
remote controllers in
the same refrigerant
system display
U4?
YES
Reset the power supply once.
Does the
microcomputer
normal monitor indication
lamp (HAP) on the outdoor
unit main PCB
blink?
YES
Does the
seven-segment
display show (1) or (2)?
(∗1)
YES
The
lamp does not turn
OFF for a period of 12
minutes or more.
NO
A
Go to the next page.
NO
YES
YES
Are the
indoor-outdoor and
NO
outdoor-outdoor
transmission wirings
normal?
NO
Is
voltage between
L1 and N terminals of
NO
the outdoor unit main PCB
within ±10% of the voltage
range?
YES
Fuse on the
NO
outdoor unit main PCB
has blown out.
NO
YES
Troubleshooting by Error Code
Refer to troubleshooting
U4-03
(Indoor unit system
transmission error)
Correct the power supply
wiring.
Press and hold the RETURN
(BS3) button on the master
outdoor unit main PCB for a
period of 5 seconds or more.
(The system will not operate
for a period of 12 minutes at
maximum.)
YES
Replace the indoor unit
control PCB.
Modify the transmission
wirings.
Correct the voltage.
∗1. :OFF
:ON :BLINK
(1)
SEG1 SEG2 SEG3
NO
(2)
YES
Replace the fuse.
Replace the outdoor unit
main PCB.
Press and hold the RETURN
(BS3) button on the outdoor
unit main PCB for a period of
5 seconds or more.
346