29eca9e9_FAQs___3M_ESPE_South_Africa__Solution
[Problem] The power level display of the handpiece flashes red. The ongoing exposure is interrupted (light off signal is emitted) followed by a 2-second error signal; the and piece switches to “sleep” mode and resists further activation. [Possible Cause] The battery lacks sufficient charge. [Solution] 
Place the handpiece in the charger and recharge the battery.
FAQs - 3M ESPE South Africa
Solution