Daikin VRV IV+ Service Manual page 166

2 | Troubleshooting
2.3.163 U7-06 – Multi system address abnormality
2.3.164 U7-07 – More than 3 outdoor units on Q1-Q2 transmission
Service manual
166
3 Perform a check of the main PCB of the sub 1 outdoor unit. See
4
PCB" [ 290].
Possible cause: Faulty main PCB of the sub 1 outdoor unit.
4 Perform a check of the main PCB of the sub 2 outdoor unit. See
4
PCB" [ 290].
Possible cause: Faulty main PCB of the sub 2 outdoor unit.
5 Check that ONLY the master outdoor unit has F1‑F2 IN connection. If another
outdoor unit has F1‑F2 IN connection, correct the installation.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Main PCB on main
outdoor unit detects
transmission abnormality
on a multi installation.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check the Q1‑Q2 communication between the outdoor units. See
"4.1 Electrical circuit" [
Possible cause: Faulty or interruption in communication between outdoor
units.
2 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
3 Check that ONLY the master outdoor unit has F1‑F2 IN connection. If another
outdoor unit has F1‑F2 IN connection, correct the installation.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
More than 3 outdoor
units are detected on Q1-
Q2 transmission line.
Effect
Forced stop.
4
356].
"3.11 Main
Effect
Forced stop.
"3.11 Main
"3.11 Main
Reset
Auto reset.
4
PCB" [ 290].
Reset
Power reset at outdoor
unit.
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05