Daikin REYQ12T7Y1B - Page 30

8 Troubleshooting
Installation and operation manual
30
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353996-1E – 2018.04
Main code Sub code Cause Solution
Master Slave 1 Slave 2
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.
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.
INV1 unbalanced power supply
voltage
Check if power supply is within range.
INV2 unbalanced power supply
voltage
Check if power supply is within range.
Reversed power supply phase
malfunction
Correct phase order.
Reversed power supply phase
malfunction
Correct phase order.
INV1 voltage power shortage Check if power supply is within range.
INV1 power phase loss Check if power supply is within range.
INV2 voltage power shortage Check if power supply is within range
INV2 power phase loss Check if power supply is within range.