Having a non-functioning vaporizer can be incredibly frustrating, thankfully these issues are easily solved and can be done easily by new vapers.
First, if your heating chamber or atomizer is not heating up, make sure the battery is charged and the device is turned on.
Next, check the connections are properly fastened and clean. If the atomizer or coil is not properly connected to the device/battery, it won’t fire and may give a warning to the user. Also, clean your connections if possible, as residue can cause devices to not fire and will block connections between the atomizer and the device.
Finally, if your atomizer or coil fails to heat up, it could be time to look into a new atomizer or replace a dead coil. These two components are meant to be replaceable and will take damage over time when used. If you have a new coil that does not fire, this could be a manufacturer defect, as dud coils have been known to exist.
You may also want to consider how you're packing your herbal vaporizer, as having too much material in the chamber can drastically restrict how the vaporizer heats up.