Hitachi RAF-25NH5 Instructions De Service page 296

nspection method 1
nsert the power source, and check to see that the
LED is on.
LED off
s AC230V flowing to the L/N terminal?
Yes
s the 25A fuse working normally?
Yes
s the 5A fuse working normally?
Yes
The control P.W.B. is broken.
Replace the control P.W.B.
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LED on
No
No
Check to see that
diode stacks A and B, and SPM2A
and B are not broken.
No
s varistor 3 broken?
Yes
There is the possibility that an irregular voltage has been
flowing to the L/N terminal. Check to see that the power
source is not abnormality.
Replace the 5A fuse and varistor 3.
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Follow " nspecting external electrical parts" and check
the cause of the problem.
Connect a commercial-use 230V power source
to the L/N terminal.
varistors 1-3,
No
The control power source is broken.
Replace the control P.W.B..
Replace the broken part
and the 25A fuse.