Daikin REMQ5U7Y1B, Installer And User Reference Manual

Page: 157 / 176

24 | Troubleshooting
Installer and user reference guide
157
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
Main code Sub code Cause Solution
Master Slave 1 Slave 2
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.
Transmission outdoor unit -
inverter: INV1 transmission
trouble - main PCB (X20A,
X28A, X40A) Check connection.
Transmission outdoor unit -
inverter: FAN1 transmission
trouble - main PCB (X20A,
X28A, X40A) Check connection.
Transmission outdoor unit -
inverter: FAN2 transmission
trouble - main PCB (X20A,
X28A, X40A) Check connection.
Transmission outdoor unit -
inverter: INV2 transmission
trouble - main PCB (X20A,
X28A, X40A) Check connection.
Transmission main PCB – sub
PCB – main PCB (X20A), sub
PCB (X2A, X3A) Check connection.