Daikin VRV IV RKXYQ8T7Y1B Installation And Operation Manual page 29

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
Malfunction code: System test run not yet executed (system
operation not possible)
▪ No power is supplied to the compressor unit.
▪ Transmission wiring malfunction
▪ System mismatch. Wrong type of indoor units combined
(R410A, R407C, RA, etc). Indoor unit malfunction
▪ Heat exchanger unit malfunction
▪ Improper type of indoor units are connected.
▪ Mismatch of compressor unit and heat exchanger unit.
▪ The stop valves of the compressor unit are left closed.
▪ The piping and wiring of the specified indoor unit or heat
exchanger unit are not connected correctly to the
compressor unit.
RKXYQ5+8T7Y1B
VRV IV compressor unit for indoor installation
4P408443-1B – 2016.04
Cause
8 Troubleshooting
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.
Execute system test run.
▪ Check if all units are powered on.
▪ Check the transmission wiring.
▪ Check if other indoor units have malfunction and confirm
indoor unit mix is allowed.
▪ Check the transmission wiring to the 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.
▪ Open the stop valves on both the gas and liquid side.
▪ Confirm that the piping and wiring of the specified indoor
unit or heat exchanger unit are connected correctly to the
compressor unit.
Installation and operation manual
29