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Troubleshooting
Service manual
176
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
2.3.181 UA-28 – Branch selector box Abnormality - non-compatible branch selector box detected
Trigger
Effect
Reset
Non-compatible branch
selector box(es) detected
on F1-F2 wiring.
Alarm status ON.
Auto recovery when
transmission is normal.
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
Locate the branch selector box by checking indoor unit remote controllers
showing this error. Branch selector box that is connected to the indoor unit(s)
that show this error is subject to further investigation.
NOTICE
Other indoor units in the circuit will show U9 Error. This means "There is an error in
the circuit but it is not the unit that shows U9".
3
Check system layout. Only BS-Q-A type branch selector boxes are compatible
with VRV IV+ Heat Recovery System.
Possible cause:
Older type branch selector box installed.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.182 UA-29 – Branch selector box Abnormality - Connected Indoor Unit Index too Low
Trigger
Effect
Reset
Total indoor unit index
connected to branch
selector box is too low.
Alarm status ON.
Power reset at branch
selector box.
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
Locate the branch selector box by checking indoor unit remote controllers
showing this error. Branch selector box that is connected to the indoor unit(s)
that show this error is subject to further investigation.
Summary of Contents for VRV IV+
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