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Troubleshooting by Error Code
SiAF332111E
310
Part 6 Service Diagnosis
5.60 Transmission Error between Indoor Units and Outdoor
Units
Applicable
Models
All indoor unit models
All outdoor unit models
Error Code
U4
Method of Error
Detection
Microcomputer checks if transmission between indoor and outdoor units is normal.
Error Decision
Conditions
Transmission is not carried out normally for a certain amount of time.
Supposed
Causes
Short circuit, wrong wiring, disconnection, or poor contact in indoor-outdoor transmission
wiring (F1/F2)
Outdoor unit power supply is OFF
System address does not match
Defective indoor unit PCB
Defective outdoor unit main PCB
Troubleshooting
RXQ4/5AR
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
YES
NO
All indoor
unit remote
controllers of the same
refrigerant system
display
U4
.
Is indoor-outdoor
unit transmission
wiring normal?
Has the
indoor or
outdoor unit main
PCB been replaced, or
has the indoor-outdoor
unit transmission
wiring been
modified?
NO
YES
Replace the indoor unit PCB
indicated by the error code
U4
.
Fix the indoor-outdoor
unit transmission wiring.
NO
YES
Reset the power supply.
Press and hold the
RESET
(BS5)
button on the master
outdoor unit main PCB (A1P)
for 5 seconds.
∗
The unit will not operate for
up to 12 minutes.
A
Go to the next page.
Summary of Contents for VRV S RXQ4/5ARV1
Page 1: ...Service Manual Cooling Only 50 60 Hz RXQ4 5ARV1 RXMQ6ARV1 RXMQ8 10 12ARY1 SiAF332111E...
Page 369: ...SiAF332111E Wiring Diagrams Part 7 Appendix 363 RXMQ6ARV1 C 3D137051...
Page 370: ...Wiring Diagrams SiAF332111E 364 Part 7 Appendix RXMQ8ARY1 C 3D137060...
Page 371: ...SiAF332111E Wiring Diagrams Part 7 Appendix 365 RXMQ10 12ARY1 3D121610B...
Page 375: ...SiAF332111E Wiring Diagrams Part 7 Appendix 369 FXMQ40 50 63 80 100ARV1 3D127112 04 59...