10 Troubleshooting
Installer and user reference guide
44
RXYTQ8~16U7YF
VRV IV+ heat pump for high ambient temperatures
4P561157-1 – 2018.09
Main code
Sub code
Cause
Solution
Master
Slave 1
Slave 2
Discharge temperature sensor
malfunction (R21T): open circuit - A1P
(X19A)
Check connection on PCB or actuator.
Discharge temperature sensor
malfunction (R21T): short circuit - A1P
(X19A)
Check connection on PCB or actuator.
Discharge temperature sensor
malfunction (R22T): open circuit - A1P
(X19A)
Check connection on PCB or actuator.
Discharge temperature sensor
malfunction (R22T): short circuit - A1P
(X19A)
Check connection on PCB or actuator.
Compressor casing temperature
sensor malfunction (R8T): open circuit
- A1P (X19A)
Check connection on PCB or actuator.
Compressor casing temperature
sensor malfunction (R8T): short circuit
- A1P (X19A)
Check connection on PCB or actuator.
Compressor casing temperature
sensor malfunction (R9T): open circuit
- A1P (X19A)
Check connection on PCB or actuator.
Compressor casing temperature
sensor malfunction (R9T): short circuit
- A1P (X19A)
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.
Low pressure sensor malfunction
(S1NPL): open circuit - A1P (X31A)
Check connection on PCB or actuator.
Low pressure sensor malfunction
(S1NPL): short circuit - A1P (X31A)
Check connection on PCB or actuator.
Transmission outdoor unit - inverter:
INV1 transmission trouble - A1P
(X20A, X28A, X40A)
Check connection.
Transmission outdoor unit - inverter:
FAN1 transmission trouble - A1P
(X20A, X28A, X40A)
Check connection.
Transmission outdoor unit - inverter:
FAN2 transmission trouble - A1P
(X20A, X28A, X40A)
Check connection.
Transmission outdoor unit - inverter:
INV2 transmission trouble - A1P
(X20A, X28A, X40A)
Check connection.
INV1 unbalanced power supply
voltage
Check if power supply is within range.
INV2 unbalanced power supply
voltage
Check if power supply is within range.