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