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Troubleshooting
Installer and user reference guide
126
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
Main code
Cause
Solution
▪
The stop valves of the compressor unit are
left closed.
▪
Insufficient refrigerant
▪
Open the stop valves on both the gas and
liquid side.
▪
Check if the additional refrigerant charge has
been finished correctly. Recalculate the
required amount of refrigerant from the
piping length and add an adequate amount of
refrigerant.
Refrigerant overcharge
Recalculate the required amount of refrigerant
from the piping length and correct the
refrigerant charge level by recovering any
excessive refrigerant with a refrigerant recovery
machine.
Ambient temperature sensor malfunction
Heat exchanger unit: (R1T) - A1P (X16A)
Check connection on PCB or actuator.
Discharge temperature sensor malfunction:
open circuit / short circuit
Compressor unit: (R2T) - A1P (X12A)
Check connection on PCB or actuator.
Heat exchanger gas sensor malfunction
Heat exchanger unit: (R2T) - A1P (X18A)
Check connection on PCB or actuator.
Suction temperature sensor malfunction
Compressor unit: (R3T) - A1P (X12A)
Compressor unit: (R5T) - A1P (X12A)
Check connection on PCB or actuator.
Coil temperature sensor malfunction
Heat exchanger unit: (R3T) - A1P (X17A)
Check connection on PCB or actuator.
Liquid temperature sensor (after subcool HE)
malfunction
Compressor unit: (R7T) - A1P (X13A)
Check connection on PCB or actuator.
Gas temperature sensor (after subcool HE)
malfunction
Compressor unit: (R4T) - A1P (X12A)
Check connection on PCB or actuator.
High pressure sensor malfunction: open
circuit / short circuit
Compressor unit: (BIPH) - A1P (X17A)
Check connection on PCB or actuator.
Low pressure sensor malfunction: open circuit /
short circuit
Compressor unit: (BIPL) - A1P (X18A)
Check connection on PCB or actuator.
Transmission compressor unit - inverter: INV1
transmission trouble
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.
Insufficient supply voltage
Check if the supply voltage is supplied properly.
