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Troubleshooting
Service manual
170
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
2.3.170 UA-16 – Combination abnormality - More than 64 indoor units detected on same system
Trigger
Effect
Reset
Main PCB on main
outdoor unit detects
more than 64 indoor units
on same system.
Forced stop.
Automatic reset after re-
initialization detects less
than 64 compatible
indoor units.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Change the installation to include a maximum of 64 indoor units.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.171 UA-17 – Combination abnormality - Local setting abnormality
Trigger
Effect
Reset
Main PCB on main
outdoor unit detects
compatibility issues.
Forced stop.
Automatic reset after re-
initialization detects
compatible units and
normal field settings.
Main PCB detects field
setting abnormality.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Check for improper combination of units. See the combination table in the
Databook for more information. Change the installation with ONLY compatible
type units.
2
Check and verify the outdoor unit field settings with the default settings. See
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
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