Daikin VRV IV+ RYYQ8U7Y1B Series Installer And User Manual page 158

23 | Troubleshooting
Main code
Master
Installer and user reference guide
158
Sub code
Slave 1 Slave 2
Cause
High pressure sensor
malfunction (S1NPH): open
circuit - A1P (X32A)
High pressure sensor
malfunction (S1NPH): short
circuit - A1P (X32A)
Low pressure sensor
malfunction (S1NPL): open
circuit - A1P (X31A)
Low pressure sensor
malfunction (S1NPL): short
circuit - A1P (X31A)
Transmission outdoor unit -
inverter: INV1 transmission
trouble - A1P (X20A, X28A,
X40A)
Transmission outdoor unit -
inverter: FAN1 transmission
trouble - A1P (X20A, X28A,
X40A)
Transmission outdoor unit -
inverter: FAN2 transmission
trouble - A1P (X20A, X28A,
X40A)
Transmission outdoor unit -
inverter: INV2 transmission
trouble - A1P (X20A, X28A,
X40A)
INV1 unbalanced power
supply voltage
INV2 unbalanced power
supply voltage
Reversed power supply phase
malfunction
Reversed power supply phase
malfunction
INV1 voltage power shortage
INV1 power phase loss
INV2 voltage power shortage
INV2 power phase loss
Solution
Check connection on PCB or
actuator.
Check connection on PCB or
actuator.
Check connection on PCB or
actuator.
Check connection on PCB or
actuator.
Check connection.
Check connection.
Check connection.
Check connection.
Check if power supply is
within range.
Check if power supply is
within range.
Correct phase order.
Correct phase order.
Check if power supply is
within range.
Check if power supply is
within range.
Check if power supply is
within range
Check if power supply is
within range.
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11