Daikin VRV RXYMQ-A Series Service Manual page 259

SiME332106E
Troubleshooting
Note(s)
2. RXYMQ4AVMK: 220-240V between L and N
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
Has the
indoor or
outdoor unit PCB
been replaced, or has
the indoor-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 (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
Are the
indoor-outdoor
transmission wirings
normal?
YES
RXYMQ4-6AYFK: 380-415V between L1 and N
NO
YES
Are the
NO
indoor-outdoor
transmission wirings
normal?
NO
Is voltage
between terminals ( 2 )
NO
of the outdoor unit main
PCB normal?
YES
Fuse on the
NO
outdoor unit main PCB
has blown out.
NO
YES
NO
Troubleshooting by Error Code
Go to the next page.
U4-03
(Indoor unit system
transmission error)
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.)
YES
Replace the indoor unit PCB.
Modify the transmission
wirings.
Correct the voltage.
1 :OFF
:ON :BLINK
NO
(1)
SEG1 SEG2 SEG3
(2)
YES
Replace the fuse.
Replace the outdoor unit
main PCB (A1P).
Press and hold RETURN
(BS3) on the outdoor unit
main PCB (A1P) for a period
of 5 seconds or more.
Modify the transmission
wirings.
Replace the outdoor unit main
PCB (A1P).
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