278
Trouble Shooting Guide
Self-diagnosis function
Trouble shooting Flow
Fault diagnosis and Trouble shooting guide
53
Error Item
Error
Display No.
Major Error Occurrence Cause
Meaning
Communication error
(indoor unit - main PCB)
If failing to receive
indoor unit signal at
main PCB
• No connection of communication line
• Short or fusing of communication line
• Poor outdoor unit PCB or indoor unit PCB
No
Check and connect power line.
Yes
Is power supplied to all indoor units?
No
Check and connect the
communication line.
Yes
Are communication
lines of indoor units normal?
No
Perform automatic addressing again.
Yes
Is automatic addressing
performed accurately?
No
Check or replace the main PCB
Yes
Is communication circuit part of the
outdoor unit normal?
Check or replace the indoor unit PCB
Summary of Contents for multi V PLUS
Page 21: ...Service Manual 21 Indoor Unit Indoor Units ...
Page 74: ...74 Indoor Unit ...
Page 86: ...86 Indoor Unit ...
Page 142: ...142 Indoor Unit ...
Page 160: ...160 Indoor Unit ...
Page 179: ...Service Manual 179 Outdoor unit ...
Page 239: ...Service Manual 239 Wiring Diagrams 5 8 60Hz 220V Main Outdoor Unit 8HP 10HP 12HP ...
Page 245: ...Service Manual 245 Trouble shooting guide ...
Page 296: ...296 Trouble Shooting Guide ...
Page 297: ...Service Manual 297 Appendix ...
Page 303: ...Service Manual 303 Exploded View Replacement Parts List ...