Daikin VRV IV RKXYQ8T7Y1B Installation And Operation Manual page 30

8 Troubleshooting
In case of 8 HP:
Main code Sub code
Installation and operation manual
30
Cause
▪ Heat exchanger fan malfunction.
▪ Drain pump feedback contact is open.
Earth leakage detector activated
Compressor unit: (T1A) - A1P (X101A)
No earth leakage detector detected
Compressor unit: (T1A) - A1P (X101A)
High pressure switch was activated
Compressor unit: (S1PH) - A1P (X4A)
▪ Refrigerant overcharge
▪ Stop valve closed
Stop valve closed (liquid)
▪ Refrigerant overcharge
▪ Stop valve closed
Low pressure malfunction:
▪ Stop valve closed
▪ Refrigerant shortage
▪ Indoor unit malfunction
Electronic expansion valve malfunction (subcool)
Compressor unit: (Y1E) - A1P (X21A)
Electronic expansion valve malfunction (main)
Heat exchanger unit: (Y1E) - A1P (X7A)
Discharge temperature too high:
▪ Stop valve closed
▪ Refrigerant shortage
Compressor unit: (R21T) - A1P (X29A)
▪ Refrigerant overcharge
▪ Stop valve closed
Ambient temperature sensor malfunction
Heat exchanger unit: (R1T) - A1P (X16A)
Discharge temperature sensor malfunction
Compressor unit: (R21T): open circuit - A1P
(X29A)
Discharge temperature sensor malfunction
Compressor unit: (R21T): short circuit - A1P
(X29A)
Heat exchanger gas sensor malfunction
Heat exchanger unit: (R2T) - A1P (X18A)
Suction temperature sensor malfunction
Compressor unit: (R3T) - A1P (X30A)
Suction temperature sensor malfunction
Compressor unit: (R7T) - A1P (X30A)
De-icing temperature sensor malfunction
Heat exchanger unit: (R3T) - A1P (X17A)
Liquid temperature sensor (after subcool HE)
malfunction
Compressor unit: (R5T) - A1P (X30A)
Gas temperature sensor (after subcool HE)
malfunction
Compressor unit: (R6T) - A1P (X30A)
Solution
In the heat exchanger unit:
▪ Check connection on PCB: A1P (X15A)
▪ Check connection on terminal block (X2M)
▪ Check the fan connectors.
Restart the unit. If the problem reoccurs, contact
your dealer.
Replace the earth leakage detector.
Check stop valve situation or abnormalities in
(field) piping or airflow over air cooled coil.
▪ Check refrigerant amount+recharge unit.
▪ Open stop valves
Open liquid stop valve.
▪ Check refrigerant amount+recharge unit.
▪ Open stop valves.
▪ Open stop valves.
▪ Check refrigerant amount+recharge unit.
▪ Check the user interface's
transmission wiring between the outdoor unit
and the indoor unit.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
▪ Open stop valves.
▪ Check refrigerant amount+recharge unit.
▪ Check refrigerant amount+recharge unit.
▪ Open stop valves.
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.
VRV IV compressor unit for indoor installation
4P408443-1B – 2016.04
display or
RKXYQ5+8T7Y1B