Hitachi FSXN Series Service Manual page 184

8 Troubleshooting
No
Is PCB setting
Non-pole operating.
Yes
Yes
Is LED3 (yellow)
on PCB ON?
No
Is LED3 (yellow) on
PCB flashing more than
once in 10 seconds?
Yes
Does refrigeration system
setting between DSW1
on PCB1 and DSW5
on PCB correspond?
Yes
Does Alarm occur with
all indoor units?
Yes
Faulty PCB(1)
*1) In the case that terminating resistance (DSW10, contact 1) is in the OFF when the H-LINK connection is performed.
Set terminating resistance to ON when #1 and #2 on TB2 is removed.
Set terminating resistance toOFF when #1 and #2 on TB2 is reconnected.
* Check item
Power supply
400V 50Hz
178
SMGB0065 rev. 1 - 12/2010
Is LED3 (yellow)
ON even if #1 and #2
on TB2 is removed?
No
No
No
No
Faston terminal
N1
Set it correctly.
Yes
Faulty PCB.
Check other indoor units.
Check wiring between
CH unit and indoor units
or fuse (EF1) for PCB.
Set correctly.
Faulty PCB.
Indoor
Unit