Hitachi RPI-0.8FSG1 Service Manual page 42

TROUBLESHOOTING
Is DSW10-1P
(Terminal Resistance)
on PCB1 ON? *1)
Yes
Is LED1 (red) on
PCB1 ON?
Yes
Remove CN2 of
PCB1. *2)
Is LED3 (yellow)
on PCB1 ON?
No
Is LED3 (yellow)
on PCB1 flickering
more than once in
10 seconds?
Yes
Connect CN2 of
PCB1.
Is DSW5-1P (End
Terminal Resistance)
of PCB(1) ON?
Yes
Is LED1 (red) on
PCB(1) ON?
Yes
Is LED3 (green) on
PCB(1) ON?
No
Is LED3 (yellow)
on PCB(1) flickering
more than once in
10 seconds?
Yes
Remove CN8 of PCB(1).
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No
/
Is the voltage
No
between faston
terminal "R1" and
"N" of PCB1 220V
or 240V?
Is connector (PCN1,
CN1) for transformer
is loosened?
Yes
Is the fuse for
PCB1 melted?
No
No
No
Is voltage between
No
"R1" and "N" of PCN1
on PCB(1) 220V
or 240V
Is connector (TR,
CN7) for transformer on
PCB(1) is loosened?
Is the fuse for
PCB(1) melted?
No
Yes
Is LED3 (green)
still ON after removing
CN9 on PCB(1)?
No
No
No
Yes
Yes
No
Yes
PCB1: Outdoor Unit Printed Circuit Board
PCB1': Indoor Unit Printed Circuit Board
No
Yes
Yes
No
Yes
Yes
Set it correctly.
Check the fuses of
outdoor unit power
supply.
Plug PCN1 and CN1
correctly.
Replace fuse.
Faulty PCB1
Set it correctly.
Check CH unit wiring.
Plug TR and CN7
correctly.
Replace fuse.
Faulty PCB(1)
Check other CH units.
Check wiring between
outdoor unit and indoor
units or fuse (EF3) for
PCB(1).
Outdoor
Unit
CH
Unit