Daikin RDXYQ5T8V1B Installer And User Manual page 126

22 | Troubleshooting
Main code
▪ The stop valves of the compressor unit are
left closed.
▪ Insufficient refrigerant
Refrigerant overcharge
Ambient temperature sensor malfunction
Heat exchanger unit: (R1T) - A1P (X16A)
Discharge temperature sensor malfunction:
open circuit / short circuit
Compressor unit: (R2T) - A1P (X12A)
Heat exchanger gas sensor malfunction
Heat exchanger unit: (R2T) - A1P (X18A)
Suction temperature sensor malfunction
Compressor unit: (R3T) - A1P (X12A)
Compressor unit: (R5T) - A1P (X12A)
Coil temperature sensor malfunction
Heat exchanger unit: (R3T) - A1P (X17A)
Liquid temperature sensor (after subcool HE)
malfunction
Compressor unit: (R7T) - A1P (X13A)
Gas temperature sensor (after subcool HE)
malfunction
Compressor unit: (R4T) - A1P (X12A)
High pressure sensor malfunction: open
circuit / short circuit
Compressor unit: (BIPH) - A1P (X17A)
Low pressure sensor malfunction: open circuit /
short circuit
Compressor unit: (BIPL) - A1P (X18A)
Transmission compressor unit - inverter: INV1
transmission trouble
INV1 unbalanced power supply voltage
Heat exchanger unit capacity setting
malfunction.
Insufficient supply voltage
Installer and user reference guide
126
Cause Solution
▪ 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.
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.
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 on PCB or actuator.
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.
Check if the supply voltage is supplied properly.
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12