24e7d3a5_FAQs___3M_ESPE_Suomi__Possible_Cause
[Problem] The LED showing the operating status in the charger flashes alternately red and green. The handpiece is not in the charger. [Solution] Have the charger repaired. [Possible Cause] 
Charger is defective.
FAQs - 3M ESPE Suomi
Possible Cause