Daikin VRV IV Installer And User Reference Manual page 144

24 | Troubleshooting
Main code
Master
Installer and user reference guide
144
Sub code
Slave 1 Slave 2
Cause
Discharge temperature sensor
malfunction (R21T): open
circuit - A1P (X29A)
Discharge temperature sensor
malfunction (R21T): short
circuit - A1P (X29A)
Discharge temperature sensor
malfunction (R22T): open
circuit - A1P (X29A)
Discharge temperature sensor
malfunction (R22T): short
circuit - A1P (X29A)
Compressor casing
temperature sensor
malfunction (R8T): open
circuit - A1P (X29A)
Compressor casing
temperature sensor
malfunction (R8T): short
circuit - A1P (X29A)
Suction temperature sensor
malfunction (R3T) - A1P
(X30A)
De-icing temperature sensor
malfunction (R7T) - A1P
(X30A)
Liquid temperature sensor
(after subcool HE) malfunction
(R5T) - A1P (X30A)
Liquid temperature sensor
(coil) malfunction (R4T) - A1P
(X30A)
Gas temperature sensor (after
subcool HE) malfunction (R6T)
- A1P (X30A)
High pressure sensor
malfunction (S1NPH): open
circuit - A1P (X32A)
High pressure sensor
malfunction (S1NPH): short
circuit - A1P (X32A)
Solution
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.
Check connection on PCB or
actuator.
Check connection on PCB or
actuator.
Check connection on PCB or
actuator.
Check connection on PCB or
actuator.
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10