SiUS342004EB
Troubleshooting by Error Code
Part 6 Service Diagnosis
288
Note(s)
Reference
1. A4P
CHECK 4
Refer to page 362.
NO
YES
NO
YES
NO
Power ON
Restart the
compressor, and
then check for the
operation. Does the
error recur?
Has the
compressor started
up at high differential
pressure (0.5 MPa
(72.5 psi) or
more)?
The error recurs
at startup.
YES
YES
Power OFF
Power OFF
Power ON
Power ON
Power OFF
Pressure equalization failure.
Check for the refrigerant
system.
Quit work.
Pressure equalization failure
may have occurred. Check for
the refrigerant system.
YES
YES
NO
Replace the in
v
erter PCB.
(*1)
NO
The error recurs at
startup.
Continue operation.
The error could have
resulted from instantaneous
power failure.
A
Continue operation.
Replace the compressor.
CHECK 4
Is the power
transistor
normal?
This is not a failure of the
inverter PCB. Reinstall the
PCB.
Replace the compressor.
YES
NO
NO
The internal
wiring of the
compressor coil is
defecti
v
e.
The ins
u
lation
resistance of the rele
v
ant
compressor is low
(< 100 k
)
YES
Replace the in
v
erter
PCB. (*1)
Summary of Contents for VRV RXYQ72-384XAYCA
Page 1: ...Service Manual RXYQ72 384XAYCA RXYQ72 384XBYCA Heat Pump 60 Hz SiUS342004EB...
Page 395: ...SiUS342004EB Wiring Diagrams Part 7 Appendix 388 FXFQ07 09 12 15 18 24 30 36 48TVJU 3D086460B...
Page 397: ...SiUS342004EB Wiring Diagrams Part 7 Appendix 390 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 401: ...SiUS342004EB Wiring Diagrams Part 7 Appendix 394 FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 402: ...Wiring Diagrams SiUS342004EB 395 Part 7 Appendix FXDQ07 09 12 18 24MVJU C 3D050501C...
Page 409: ...SiUS342004EB Wiring Diagrams Part 7 Appendix 402 FXHQ12 24 36MVJU 3D048116C...
Page 410: ...Wiring Diagrams SiUS342004EB 403 Part 7 Appendix FXAQ07 09 12 18 24PVJU 3D075354F...
Page 418: ...Wiring Diagrams SiUS342004EB 411 Part 7 Appendix VAM1200GVJU 3D073270D...
