Daikin VRV 5 RXYA8A7Y1B Installer And User Manual page 182

25 | Troubleshooting
Main Sub code
code
Master Slave 1
,
,
Installer and user reference guide
182
Cause
High pressure sensor malfunction
(S1NPH): open circuit - main PCB
(X32A)
High pressure sensor malfunction
(S1NPH): short circuit - main PCB
(X32A)
Low pressure sensor malfunction
(S1NPL): open circuit - main PCB
(X31A)
Low pressure sensor malfunction
(S1NPL): short circuit - main PCB
(X31A)
Transmission outdoor unit -
inverter: INV1 transmission trouble
- main PCB (X20A, X28A, X40A)
Transmission outdoor unit -
inverter: FAN1 transmission trouble
- main PCB (X20A, X28A, X40A)
Transmission outdoor unit -
inverter: FAN2 transmission trouble
- main PCB (X20A, X28A, X40A)
Transmission main PCB – sub PCB –
main PCB (X20A), sub PCB (X2A,
X3A)
INV1 unbalanced power supply
voltage
Reversed power supply phase
malfunction
Reversed power supply phase
malfunction
INV1 voltage power shortage
INV1 power phase loss
Malfunction code: system test run
not yet executed (system operation
not possible)
An error occurred during the test
run
Test run aborted
Test run aborted due to
communication issues
Commissioning of SV unit safety
system is not completed
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.
Correct phase order.
Correct phase order.
Check if power supply is within
range.
Check if power supply is within
range.
Execute system test run.
Re-execute the test run.
Re-execute the test run.
Check the communication wires
and re-execute the test run.
Complete commissioning of SV unit
safety system. Refer to SV unit
manual for more information.
SVEO SVS
(a) (b)
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12