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Troubleshooting
Installer and user reference guide
145
RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
Main code
Sub code
Cause
Solution
Master
Slave 1
Slave 2
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.
