24e7d3a5_FAQs___3M_ESPE_Suomi__Possible_Cause
[Problem] The LED showing the operating status in the charger glows red steadily. [Solution] Dry the charge contact pins. Be careful not to bend the flexible charge contact pins in the charger. [Possible Cause] 
The charge contact pins in the handpiece or the charger base are wet.
FAQs - 3M ESPE Suomi
Possible Cause