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Troubleshooting
Installer and user reference guide
129
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
Main code
Sub code
Cause
Solution
Liquid temperature sensor (after
subcool HE) malfunction
Compressor unit: (R5T) - A1P (X30A)
Check connection on PCB or actuator.
Gas temperature sensor (after subcool
HE) malfunction
Compressor unit: (R6T) - A1P (X30A)
Check connection on PCB or actuator.
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.
