Daikin VRV 5-S - Page 162

25 | Troubleshooting
Installer and user reference guide
162
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
Main
code
Sub
code
Cause Solution SVEO
(a)
SVS
(b)
High pressure switch was activated
(S1PH) – main PCB (X2A)
Check stop valve situation or
abnormalities in (field) piping or
airflow over air cooled coil.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves
Stop valve closed (liquid) Open liquid stop valve.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves.
Low pressure malfunction:
▪ Stop valve closed
▪ Refrigerant shortage
▪ Indoor unit malfunction
▪ Open stop valves.
▪ Check refrigerant amount+recharge
unit.
▪ Check the user interface's display or
interconnection wiring between the
outdoor unit and the indoor unit.
Electronic expansion valve malfunction
(heat exchanger) (Y1E) – main PCB
(X21A)
Check connection on PCB or actuator.
Electronic expansion valve malfunction
(inverter cooling) (Y3E) – main PCB
(X23A)
Check connection on PCB or actuator.
Electronic expansion valve malfunction
(liquid injection) (Y4E) – main PCB
(X25A)
Check connection on PCB or actuator.
Electronic expansion valve malfunction
(subcool heat exchanger) (Y2E) – main
PCB (X26A)
Check connection on PCB or actuator.
Discharge temperature too high (R21T)
– main PCB (X33A):
▪ Stop valve closed
▪ Refrigerant shortage
▪ Open stop valves.
▪ Check refrigerant amount+recharge
unit.
Compressor casing temperature too
high (R8T) – main PCB (X33A):
▪ Stop valve closed
▪ Refrigerant shortage
▪ Open stop valves.
▪ Check refrigerant amount+recharge
unit.
Ambient temperature sensor
malfunction (R1T) – main PCB (X18A)
Check connection on PCB or actuator.