8 Troubleshooting
Installation and operation manual
31
8T7Y1B
VRV IV compressor unit for indoor installation
4P408443-1B – 2016.04
Main code
Sub code
Cause
Solution
High pressure sensor malfunction
Compressor unit: (S1NPH): open circuit - A1P
(X32A)
Check connection on PCB or actuator.
High pressure sensor malfunction
Compressor unit: (S1NPH): short circuit - A1P
(X32A)
Check connection on PCB or actuator.
Low pressure sensor malfunction
Compressor unit: (S1NPL): open circuit - A1P
(X31A)
Check connection on PCB or actuator.
Low pressure sensor malfunction
Compressor unit: (S1NPL): short circuit - A1P
(X31A)
Check connection on PCB or actuator.
Transmission outdoor unit - inverter: INV1
transmission trouble
Compressor unit: A1P (X20A, X28A, X42A)
Check connection.
INV1 unbalanced power supply voltage
Check if power supply is within range.
Heat exchanger unit capacity setting malfunction.
Check the type of heat exchanger unit. If
necessary, replace the heat exchanger unit.
Reversed power supply phase malfunction
Correct phase order.
Reversed power supply phase malfunction
Correct phase order.
INV1 voltage power shortage
Check if power supply is within range.
INV1 power phase loss
Check if power supply is within range.
Malfunction code: System test run not yet
executed (system operation not possible)
Execute system test run.
Faulty wiring to Q1/Q2 or indoor - outdoor
Check (Q1/Q2) wiring. Do NOT use Q1/Q2.
Faulty wiring to Q1/Q2 or indoor - outdoor
Check (Q1/Q2) wiring. Do NOT use Q1/Q2.
System test run abnormal ending
Execute test run again.
Warning: faulty wiring to Q1/Q2
Check Q1/Q2 wiring. Do NOT use Q1/Q2.
Malfunction code: faulty wiring to Q1/Q2
Check Q1/Q2 wiring. Do NOT use Q1/Q2.
▪ Too many indoor units are connected to F1/F2
line
▪ Bad wiring between outdoor and indoor units
Check indoor unit amount and total capacity
connected.
▪ System mismatch. Wrong type of indoor units
combined (R410A, R407C, RA, etc). Indoor unit
malfunction
▪ Heat exchanger unit malfunction
▪ Check if other indoor units have malfunction and
confirm indoor unit mix is allowed.
▪ Check the transmission wiring to the heat
exchanger unit.
More than 1 heat exchanger unit connected.
Check installation. Only 1 heat exchanger unit can
be installed.
▪ Improper type of indoor units are connected.
▪ Mismatch of compressor unit and heat
exchanger unit.
▪ Check the type of indoor units that are currently
connected. If they are not proper, replace them
with proper ones.
▪ Check if the compressor unit and heat
exchanger unit are compatible.
5 HP heat exchanger unit connected.
Check installation. Connect 8 HP heat exchanger
unit.
▪ Auto address malfunction (inconsistency)
▪ Mismatch of compressor unit and heat
exchanger unit.
▪ Check if transmission wired unit amount
matches with powered unit amount (by monitor
mode) or wait till initialisation is finished.
▪ Check if the compressor unit and heat
exchanger unit are compatible.
Summary of Contents for VRV IV RKXYQ8T7Y1B
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