Daikin VRV IV+ Service Manual page 175

2.3.180 UA-27 – Branch selector box Abnormality - no branch selector box detected
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
No branch selector
box(es) detected by
outdoor unit.
Total indoor units
detected are below
minimum allowed
combination.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check system layout. Heat Recovery Units needs to have branch selector
box(es) installed.
Possible cause: No branch selector boxes installed.
2 Check indoor units connected through BS Units. A system needs to have
above a minimum combination ratio of indoor units that are connected
through branch selector boxes. See Databook for more information.
Possible cause: Indoor Units connected through branch selector boxes are
below allowed minimum ratio.
3 Check the transmission wiring between branch selector box and connected
indoor unit(s). See
Possible cause: Faulty transmission wiring.
4 Check indoor unit PCB(s). See Service Manual of the respective indoor unit.
Possible cause: Faulty indoor unit PCB(s).
5 Perform a check of the branch selector box PCB. See
4
box PCB" [ 214].
Possible cause: Faulty branch selector box PCB.
6 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.
Effect
Alarm status ON.
4
"4.1 Electrical circuit" [
2 Troubleshooting
|
Reset
Auto recovery when
transmission is normal.
356].
"3.2.1 Branch selector
"3.11 Main
Service manual
175