Daikin VRV IV+ Installer And User Reference Manual page 155

Main code
Master
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
Sub code
Slave 1 Slave 2
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 (lower heat
exchanger) (Y3E) – main PCB
(X23A)
Electronic expansion valve
malfunction (subcool heat
exchanger) (Y2E) – main PCB
(X22A)
Electronic expansion valve
malfunction (receiver gas) (Y4E)
– main PCB (X25A)
Electronic expansion valve
malfunction (inverter cooling)
(Y5E) – sub PCB (X8A)
Electronic expansion valve
malfunction (auto charge) (Y6E)
- sub PCB (X10A)
Discharge temperature too high
(R21T/R22T) – main PCB
(X19A):
▪ Stop valve closed
▪ Refrigerant shortage
Compressor casing
temperature too high (R15T) –
main PCB (X19A):
▪ Stop valve closed
▪ Refrigerant shortage
▪ Refrigerant overcharge
▪ Stop valve closed
Ambient temperature sensor
malfunction (R1T) – main PCB
(X18A)
24 Troubleshooting
|
Solution
▪ Open stop valves.
▪ Check refrigerant
+recharge unit.
▪ Check the user interface's
display or transmission wiring
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.
Installer and user reference guide
amount
amount
amount
amount
155