24e7d3a5_FAQs___3M_ESPE_Suomi__Possible_Cause
[Problem] The LED showing the operating status in the charger does not come on even though the plug has been connected to an electrical outlet. [Solution] Use a different power outlet. Have the charger repaired. [Possible Cause] 
Power outlet carries no voltage. Charger is defective.
FAQs - 3M ESPE Suomi
Possible Cause