Daikin VRV 5 RXYA8A7Y1B, Installer And User Manual

Page: 181 / 200

25 | Troubleshooting
Installer and user reference guide
181
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
Main
code
Sub code Cause Solution SVEO
(a)
SVS
(b)
Master Slave 1
Discharge temperature sensor
malfunction (R21T): open circuit –
main PCB (X33A) Check connection on PCB or
actuator.
Discharge temperature sensor
malfunction (R21T): short circuit -
main PCB (X33A) Check connection on PCB or
actuator.
Compressor casing temperature
sensor malfunction (R15T): open
circuit - main PCB (X33A) Check connection on PCB or
actuator.
Compressor casing temperature
sensor malfunction (R15T): short
circuit - main PCB (X33A) Check connection on PCB or
actuator.
Suction compressor temperature
sensor (R12T) – main PCB (X35A) Check connection on PCB or
actuator.
Suction temperature sensor (R10T)
– main PCB (X29A) Check connection on PCB or
actuator.
Heat exchanger deicer temperature
sensor (R11T) – main PCB (X35A) Check connection on PCB or
actuator
Upper heat exchanger – gas -
temperature sensor (R8T) – main
PCB (X29A) Check connection on PCB or
actuator.
Lower heat exchanger – gas -
temperature sensor (R9T) main PCB
(X29A) Check connection on PCB or
actuator.
Liquid main - temperature sensor
(R3T) – main PCB (X30A) Check connection on PCB or
actuator.
Subcool heat exchanger – liquid -
temperature sensor (R7T) - main
PCB (X30A) Check connection on PCB or
actuator.
Subcool heat exchanger – liquid -
temperature sensor (R16T) - main
PCB (X35A) Check connection on PCB or
actuator.
Upper heat exchanger – liquid -
temperature sensor (R4T ) - main
PCB (X30A) Check connection on PCB or
actuator.
Lower heat exchanger – liquid -
temperature sensor (R5T ) - main
PCB (X30A) Check connection on PCB or
actuator.
Subcool heat exchanger – gas -
temperature sensor (R6T) – main
PCB (X30A) Check connection on PCB or
actuator.
Receiver gas temperature sensor
(R13T) – main PCB (X46A) Check connection on PCB or
actuator.