Hitachi UC 10SL2 Service Manual page 6

(3) Trouble mode (C)
Pilot lamp does not go on after
battery has been connected.
(Charging does not start.)
Are connection terminals of
YES
the charger or battery dirty,
Remove dirt or correct abnormality.
deformed, or otherwise
abnormal?
NO
Check with a tester.
NO
Is battery voltage between the
Replace the battery.
"+" and "-" terminals normal?
Normally 6 to 12.75 VDC
YES
Faulty internal circuit
Replace the PCB.
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