There is no LED response OR There is an LED response, but the heater is inactive.

If there is no LED response after pressing the operational button 3 times as per startup instruction, than the device is out of power.  Please try to charge as the most basic resolution, but we are sure you already tried that.

If the device does have light flashes during charge but looses power immediately after disconnecting from the power source, than it means the battery can no longer hold any power. 

This happens either because of a defective battery or the operational button was press and held inadvertently by outside force for a long period time.  This is very rare but could cause the battery to be completely drained.

Contact Cloudious9 support for resolution.