Daikin VRV 5 RXYA8A7Y1B Installer And User Manual page 180

25 | Troubleshooting
Main Sub code
code
Master Slave 1
Installer and user reference guide
180
Cause
Low pressure malfunction:
▪ Stop valve closed
▪ Refrigerant shortage
▪ Indoor unit malfunction
Electronic expansion valve
malfunction (upper heat exchanger)
(Y1E) – main PCB (X21A)
Electronic expansion valve
malfunction (inverter cooling) (Y5E)
– main PCB (X23A)
Electronic expansion valve
malfunction (lower heat exchanger)
(Y3E) – main PCB (X22A)
Electronic expansion valve
malfunction (receiver gas) (Y4E) –
main PCB (X25A)
Electronic expansion valve
malfunction (subcool heat
exchanger) (Y2E) – main PCB (X26A)
Electronic expansion valve
malfunction (liquid injection)(Y7E)
- sub PCB (X9A)
Discharge temperature too high
(R21T) – main PCB (X33A):
▪ Stop valve closed
▪ Refrigerant shortage
Compressor casing temperature too
high (R15T) – main PCB (X33A):
▪ Stop valve closed
▪ Refrigerant shortage
▪ Refrigerant overcharge
▪ Stop valve closed
Ambient temperature sensor
malfunction (R1T) – main PCB
(X18A)
Solution
▪ Open stop valves.
▪ Check refrigerant
+recharge unit.
▪ Check the user interface's display
or interconnection
between the outdoor unit and the
indoor unit.
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.
▪ Open stop valves.
▪ Check refrigerant
+recharge unit.
▪ Open stop valves.
▪ Check refrigerant
+recharge unit.
▪ Check refrigerant
+recharge unit.
▪ Open stop valves.
Check connection on PCB or
actuator.
SVEO SVS
(a) (b)
amount
wiring
amount
amount
amount
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12