Daikin VRV IV+ Service Manual page 173

2.3.177 UA-23 – Branch selector box Abnormality - Connected Indoor Unit Index too High
2.3.178 UA-25 – Branch selector box Abnormality - Transmission Wiring Abnormality between BS
Unit and Outdoor Unit
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
1 An only multi combination compatible type outdoor unit is detected on a
single installation. Check databook for proper combination.
Possible cause: REMQ Unit detected without multi combination. Install REMQ
unit in a multi installation.
2 Check the Q1‑Q2 communication between the outdoor units. See
"4.1 Electrical circuit" [
Possible cause: Faulty or interruption in communication between outdoor
units.
3 Perform a check of the main PCB of the main outdoor unit. See
4
PCB" [ 290].
Possible cause: Faulty main PCB of the main outdoor unit.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Total indoor unit index
connected to branch
selector box is too high.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check total index and total count for indoor units. See Data book on Business
Portal for more information.
Possible cause: Indoor Unit capacity connected is too high.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Transmission abnormality
detected between
outdoor unit and branch
selector box.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
4
356].
Effect
Alarm status ON.
Effect
Alarm status ON.
2 Troubleshooting
|
"3.11 Main
Reset
Power reset at branch
selector box.
Reset
Auto recovery when
transmission is normal.
Service manual
173