Hitachi RAS-5HVRNM1E Service Manual page 221

8 Troubleshooting
*1)
Is DSW5-1P (terminal
resistance on PCB1) ON?
Yes
No
Is LED1 (red) on
PCB1 ON?
Yes
Remove CN8 of
PCB1
Yes
Is LED2 (green)
on PCB1 ON?
No
Is LED3 (yellow) on
No
PCB1 flickering
more than once in
10 seconds?
Yes
Connect CN8 of
PCB1
Is PCB1'
No
setting non-pole
operating?
Yes
Yes
Is LED3 on PCB1'
ON?
Is LED 3 (yellow) on PCB1'
flickering more than once in 10
seconds?
Does the refrigeration
system setting between
DSW4+RSW1 on PCB1
and DSW5+RSW2 on
PCB1' match?
Does the alarm occur with all
the indoor units?
Faulty PCB1
213
SMGB0060 rev. 1- 12/2010
No
Is the voltage
between the terminal
"1" and "3" of PCB1
220V or 240V? *2)
Yes
Is connector
Yes
(PCN2, CN1) for the
transformer loosened?
Yes
Yes
Is the fuse for
PCB1 blown out?
No
Is LED3 (yellow) ON, even
if CN2 of PCB1' is removed?
No
Check the wiring between the
outdoor unit and the indoor
units or the fuse (EF1) for
PCB1
Set correctly
Faulty PCB1'
Set it correctly
No
Check the fuses of the
outdoor unit power supply
Plug PNC2 and CN11
correctly
Replace the fuse
Faulty PCB1
Set correctly
Yes
Faulty PCB1
Check other indoor units
*1) In case that terminal resistance
(DSW5-1P) is OFF when H-Link II
connection is performed.
– Set the terminal resistance to
ON when CN8 is removed.
– Set the terminal resistance
to OFF when CN8 is
reconnected.
*2) Check item
Power supply Faston terminal
380-415V/50Hz between 1 and 3 of
PCN1 on PCB
8