19 Troubleshooting
Installation and operation manual
42
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P546222-1B – 2020.10
Main code
Sub code
Cause
Solution
Master
Slave 1
Slave 2
Discharge temperature sensor
malfunction (R21T): open circuit – main
PCB (X19A)
Check connection on PCB or actuator.
Discharge temperature sensor
malfunction (R21T): short circuit - main
PCB (X19A)
Check connection on PCB or actuator.
Discharge temperature sensor
malfunction (R22T): open circuit - main
PCB (X19A)
Check connection on PCB or actuator.
Discharge temperature sensor
malfunction (R22T): short circuit - main
PCB (X19A)
Check connection on PCB or actuator.
Compressor casing temperature sensor
malfunction (R15T): open circuit - main
PCB (X19A)
Check connection on PCB or actuator.
Compressor casing temperature sensor
malfunction (R15T): short circuit - main
PCB (X19A)
Check connection on PCB or actuator.
Suction compressor temperature sensor
(R12T) – sub PCB (X15A)
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) – sub PCB (X15A)
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.
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.
Auto charge temperature sensor (R14T )
– sub PCB (X15A)
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) – sub PCB (X17A)
Check connection on PCB or actuator.
High pressure sensor malfunction
(S1NPH): open circuit - main PCB
(X32A)
Check connection on PCB or actuator.
High pressure sensor malfunction
(S1NPH): short circuit - main PCB
(X32A)
Check connection on PCB or actuator.
Low pressure sensor malfunction
(S1NPL): open circuit - main PCB
(X31A)
Check connection on PCB or actuator.
Low pressure sensor malfunction
(S1NPL): short circuit - main PCB
(X31A)
Check connection on PCB or actuator.
Summary of Contents for REYQ8U7Y1B
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