Daikin VRV RXYQ72-384XAYCA, Service Manual

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SiUS342004EB Troubleshooting by Error Code
Part 6 Service Diagnosis 330
Troubleshooting
Do all
indoor u nit
remote controllers in
the same refrigerant
system display
U4 ?
Are the
indoor-o u tdoor and
o u tdoor-o u tdoor
transmission wirings
normal?
F u se on the
o u tdoor u nit main PCB
has b lown o u t.
Does the
se v en-segment
display show (1) or (2)?
(
∗
1)
The
lamp does not t u rn
OFF for a period of 12
min u tes or more.
Is
v oltage b etween
L1 and N terminals of
the o u tdoor u nit main PCB
within ±10 % of the v oltage
range?
Does the
microcomp u ter
normal monitor indication
lamp (HAP) on the o u tdoor
u nit main PCB
b link?
Has the
indoor or
o u tdoor u nit main
PCB b een replaced, or
has the indoor-o u tdoor or
o u tdoor-o u tdoor
transmission
wiring b een
modified?
U4-01
∗
1. :OFF :ON :BLINK
SEG1 SEG2 SEG3
(1)
(2)
Correct the v oltage.
Replace the f u se.
Press and hold the RETURN
(BS3) bu tton on the o u tdoor
u nit main PCB for a period of
5 seconds or more.
YES
NO
YES
YES
Replace the indoor u nit
control PCB.
Press and hold the RETURN
(BS3) bu tton on the master
o u tdoor u nit main PCB for a
period of 5 seconds or more.
(The system will not operate
for a period of 12 min
u tes at
maxim u m.)
Modify the transmission
wirings.
YES
Refer to tro ub leshooting
U4-03
(Indoor u nit system
transmission error)
NO
NO
NO
Replace the o u tdoor u nit
main PCB.
NO
YES
NO
NO
NO
YES
NO
Reset the power s u pply once.
YES
Check for details of error in
monitor mode.
YES
YES
Caution
Be s u re to t u rn off the power switch b efore connecting or disconnecting
connectors, or parts may b e damaged.
Any
open phase in
the power s u pply wiring
or any wrong wiring of the
o u tdoor u nit?
NO
Correct the power s u pply
wiring.
YES
Check the power s u pply wiring.
A
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