8 Troubleshooting
Installation and operation manual
31
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353996-1E – 2018.04
Main code Sub code Cause Solution
Master Slave 1 Slave 2
Malfunction code: system test run not
yet executed (system operation not
possible)
Execute system test run.
An error occurred during the test run Re-execute the test run.
, Test run aborted Re-execute the test run.
, Test run aborted due to
communication issues
Check the communication wires and
re-execute the test run.
Faulty wiring to Q1/Q2 or indoor -
outdoor
Check (Q1/Q2) wiring.
Indoor unit communication error Check user interface connection.
, Malfunction code: faulty wiring to Q1/
Q2
Check Q1/Q2wiring.
Too many indoor units are connected
to F1/F2 line
Check indoor unit amount and total
capacity connected.
System mismatch. Wrong type of
indoor units combined (R410A,
R407C, Hydrobox, etc)
Indoor unit malfunction
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.
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
— Unit is not prepared to execute leak
detection operation
Refer to requirements to be able to
execute leak detection operation.
— Indoor unit is out of temperature range
for leak detection operation
Retry when ambient conditions are
satisfied.
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