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Troubleshooting
Installer and user reference guide
128
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
Main code
Sub code
Cause
Solution
Master
Slave 1
Slave 2
High pressure switch was
activated (S1PH, S2PH) - A1P
(X2A , X3A)
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
transmission
wiring between the outdoor
unit and the indoor unit.
Electronic expansion valve
malfunction (main) (Y1E) - A1P
(X21A)
Check connection on PCB or
actuator.
Electronic expansion valve
malfunction (liquid cooling)
(Y3E) - A1P (X23A)
Check connection on PCB or
actuator.
Electronic expansion valve
malfunction (subcool) (Y2E) -
A1P (X22A)
Check connection on PCB or
actuator
Discharge temperature too
high (R21T/R22T):
▪
Stop valve closed
▪
Refrigerant shortage
▪
Open stop valves.
▪
Check refrigerant amount
+recharge unit.
Compressor casing
temperature too high (R8T/
R9T):
▪
Stop valve closed
▪
Refrigerant shortage
▪
Open stop valves.
▪
Check refrigerant amount
+recharge unit.
▪
Refrigerant overcharge
▪
Stop valve closed
▪
Check refrigerant amount
+recharge unit.
▪
Open stop valves.
Ambient temperature sensor
malfunction (R1T) - A1P
(X18A)
Check connection on PCB or
actuator.
