Hitachi FSG Series Service Manual page 32

1
TROUBLESHOOTING
24
No
Is DSW10-1P
(Terminal Resistance)
on PCB1 ON?
Yes
No
Is LED1 (red) on
PCB1 ON?
Yes
Remove CN2 of
PCB1. *1)
Yes
Yes
Is LED3 (yellow) on
PCB1 ON?
No
Is LED3 (yellow) on
PCB1 flickering more
than once in 10
seconds?
No
Yes
Connect CN2 of PCB1.
Yes
Yes
Is LED3 on PCB1' ON?
No
Is LED3 (yellow) on
No
PCB1' flickering more
than once in 10
seconds?
Yes
Does refrigeration
No
system setting between
DSW1 on PCB1' and
DSW5 on PCB1'
correspond?
Yes
No
Does Alarm occur with
all indoor units?
Yes
Faulty PCB1.
Is the voltage between
No
faston terminal "R1"
and "N" of PCB1 220V
or 240V?
Yes
Yes
Is connector (PCN1,
CN1) for transformer
loosened?
Yes
Yes
Is the fuse for PCB1
melted?
No
PCB1: Outdoor Unit Printed Circuit Board
PCB1': Indoor Unit Printed Circuit Board
Yes
Is LED3 (yellow)ON
even if CN2 of PCB1' is
removed?
No
Set it correctly.
Check the fuses of
outdoor unit power
supply.
Plug PCN1 and CN1
correctly
Replace fuse.
Faulty PCB1
Faulty PCB1.
Check other Indoor
Units
Check wiring between
outdoor unit and
indoor units or fuse
(EF1) for PCB1.
Set correctly.
Faulty PCB1'.
Outdoor
Unit
Indoor
Unit