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Troubleshooting
Installer and user reference guide
157
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
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.
Summary of Contents for RYYQ8U7Y1B
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