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Main code
Sub code
RKXYQ5T8 + RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1B – 2021.12
Cause
High pressure sensor malfunction
Compressor unit: (S1NPH): open circuit - A1P
(X32A)
High pressure sensor malfunction
Compressor unit: (S1NPH): short circuit - A1P
(X32A)
Low pressure sensor malfunction
Compressor unit: (S1NPL): open circuit - A1P
(X31A)
Low pressure sensor malfunction
Compressor unit: (S1NPL): short circuit - A1P
(X31A)
Transmission outdoor unit - inverter: INV1
transmission trouble
Compressor unit: A1P (X20A, X28A, X42A)
INV1 unbalanced power supply voltage
Heat exchanger unit capacity setting malfunction.
Reversed power supply phase malfunction
Reversed power supply phase malfunction
INV1 voltage power shortage
INV1 power phase loss
Malfunction code: System test run not yet
executed (system operation not possible)
Faulty wiring to Q1/Q2 or indoor - outdoor
Faulty wiring to Q1/Q2 or indoor - outdoor
System test run abnormal ending
Warning: faulty wiring to Q1/Q2
Malfunction code: faulty wiring to Q1/Q2
▪ Too many indoor units are connected to F1/F2
line
▪ Bad wiring between outdoor and indoor units
▪ System mismatch. Wrong type of indoor units
combined (R410A, R407C, RA, etc). Indoor unit
malfunction
▪ Heat exchanger unit malfunction
More than 1 heat exchanger unit connected.
▪ Improper type of indoor units are connected.
▪ Mismatch
of
compressor
exchanger unit.
5 HP heat exchanger unit connected.
▪ Auto address malfunction (inconsistency)
▪ Mismatch
of
compressor
exchanger unit.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection.
Check if power supply is within range.
Check the type of heat exchanger unit. If
necessary, replace the heat exchanger unit.
Correct phase order.
Correct phase order.
Check if power supply is within range.
Check if power supply is within range.
Execute system test run.
Check (Q1/Q2) wiring. Do NOT use Q1/Q2.
Check (Q1/Q2) wiring. Do NOT use Q1/Q2.
Execute test run again.
Check Q1/Q2 wiring. Do NOT use Q1/Q2.
Check Q1/Q2 wiring. Do NOT use Q1/Q2.
Check indoor unit amount and total capacity
connected.
▪ Check if other indoor units have malfunction and
confirm indoor unit mix is allowed.
▪ Check the transmission wiring to the heat
exchanger unit.
Check installation. Only 1 heat exchanger unit can
be installed.
▪ Check the type of indoor units that are currently
connected. If they are not proper, replace them
unit
and
heat
with proper ones.
▪ Check
if
exchanger unit are compatible.
Check installation. Connect 8 HP heat exchanger
unit.
▪ Check
if
matches with powered unit amount (by monitor
unit
and
heat
mode) or wait till initialisation is finished.
▪ Check
if
exchanger unit are compatible.
19 Troubleshooting
Solution
the
compressor
unit
and
transmission
wired
unit
amount
the
compressor
unit
and
Installation and operation manual
heat
heat
41
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