24 | Troubleshooting
Installer and user reference guide
159
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
Main code Sub code Cause Solution
Master Slave 1 Slave 2
Connection malfunction over
indoor units or type mismatch
(R410A, R407C, Hydrobox, etc)
Check if other indoor units have
malfunction and confirm indoor
unit mix is allowed.
Connection malfunction over
indoor units or type mismatch
(R410A, R407C, Hydrobox, etc)
Check if other indoor units have
malfunction and confirm indoor
unit mix is allowed.
Wrong unit combination (multi
system)
Check if unit types are
compatible.
Wrong outdoor unit connected Disconnect the outdoor unit.
No BS unit connected Connect a BS unit.
Old BS unit connected Disconnect the BS unit.
BS unit DIP switch abnormality Check the DIP switches of the
BS unit.
Auto address malfunction
(inconsistency)
Check if transmission wired unit
amount matches with powered
unit amount (by monitor mode)
or wait till initialisation is
finished.
Auto address malfunction
(inconsistency)
Check if transmission wired unit
amount matches with powered
unit amount (by monitor mode)
or wait till initialisation is
finished.
Stop valve closed or wrong
(during system test run)
Open stop valves.
Auto charging related
— Unusual low pressure on
suction line
Close valve A immediately. Push
BS1 to reset. Check following
items before retrying
autocharge procedure:
▪ Check if the gas side stop
valve is opened correctly.
▪ Check if the valve of the
refrigerant cylinder is
opened.
▪ Check if the air inlet and
outlet of the indoor unit are
not obstructed.
— Freeze-up prevention indoor
unit
Close valve A immediately. Push
BS1 to reset. Retry autocharge
procedure.
— Automatic charging nearly
finished
Prepare for autocharge
stopping.
— Automatic charging finished Finish autocharge mode.
Leak detection function related
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