Hitachi Utopia PAS-3HVRG, Service Manual

Page: 11 / 127

1-8
TROUBLESHOOTING
(1.1.4 Failure of Power Supply to Indoor Unit and Remote Control Switch)
1.1.5 Abnormal Transmission between Remote Control Switch and Indoor Unit
“RUN” Lamp on Remote Control Switch:
Flickering every 2 seconds
Failure of Remote Control Switch
Check it by
self-checking mode *1).
Check it by
self-checking mode *2).
Replace remote
control switch if failed.
Check connectors.
Correctly connect
wires.
Replace PCB if failed.
Take action according to the procedure
indicated in "TEST RUN".
Incorrect Wiring Connection
Unconnected Wires
to PCB
Failure of PCB
Failure of PCB
*1): Refer to Item 1.3.2.
*2): Refer to Item 1.3.1.
*1): Refer to Item 1.3.2.
*2): Refer to Item 1.3.1.
Cause Check Item
Action
(Turn OFF Main Switch)
Check cable and
connections. Repair cable or
connect it.
Phenomenon
Disconnection or Insufficient Contacting of
Remote Control Cable
Failure of Remote Control Switch
Check it by
self-checking mode *1).
Check it by
self-checking mode *2).
Replace it if remote
control switch is faulty.
Check connectors.
Correctly connect
wires.
Replace PCB if failed.
Disconnected Wire
to PCB
Failure of PCB
(in Indoor Unit
and Remote
Control Switch)
Failure of PCB