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Troubleshooting
Installer and user reference guide
160
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
Main code
Sub code
Cause
Solution
Master
Slave 1
Slave 2
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.
—
Outdoor unit is out of
temperature range for leak
detection operation
Retry when ambient
conditions are satisfied.
—
Too low pressure was noticed
during leak detection
operation
Restart leak detection
operation.
—
Indicates an indoor unit which
is not compatible with leak
detection functionality is
installed (e.g., RA DX indoor
unit, Hydrobox, …)
Refer to requirements to be
able to execute leak detection
operation.
Summary of Contents for RYYQ8U7Y1B
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