Daikin VRV IV RXMLQ8T7Y1B Series, Installation And Operation Manual

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9 Troubleshooting
Installation and operation manual
27
RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543426-1 – 2018.07
Main code Sub code Cause Solution
Master Slave 1 Slave 2
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.
High pressure sensor malfunction
(S1NPH): open circuit - A1P (X32A) Check connection on PCB or actuator.
High pressure sensor malfunction
(S1NPH): short circuit - A1P (X32A) Check connection on PCB or actuator.
Low pressure sensor malfunction
(S1NPL): open circuit - A1P (X31A) Check connection on PCB or actuator.
Low pressure sensor malfunction
(S1NPL): short circuit - A1P (X31A) Check connection on PCB or actuator.
Transmission outdoor unit - inverter:
INV1 transmission trouble - A1P
(X20A, X28A, X40A) Check connection.
Transmission outdoor unit - inverter:
FAN1 transmission trouble - A1P
(X20A, X28A, X40A) Check connection.
Transmission outdoor unit - inverter:
FAN2 transmission trouble - A1P
(X20A, X28A, X40A) Check connection.
Transmission outdoor unit - inverter:
INV2 transmission trouble - A1P
(X20A, X28A, X40A) 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.
Warning indication: Leak detection or
refrigerant amount check not
performed (system operation possible) Execute autocharge function (see
manual); unit not ready for leak
detection functionality.
Malfunction code: System test run not
yet executed (system operation not
possible) Execute system test run.
Faulty wiring to Q1/Q2 or indoor -
outdoor Check (Q1/Q2) wiring.
Faulty wiring to Q1/Q2 or indoor -
outdoor Check (Q1/Q2) wiring.
System test run abnormal ending Execute test run again.
Warning: faulty wiring to Q1/Q2 Check Q1/Q2 wiring.
Malfunction code: faulty wiring to Q1/
Q2 Check Q1/Q2 wiring.
▪ Too many indoor units are
connected to F1/F2 line
▪ Bad wiring between outdoor and
indoor units
Check indoor unit amount and total
capacity connected.