1. The bowl lid and/or the bowl are not correctly attached. When positioned on the base, turn the bowl clockwise until you hear a click and the bowl will not turn any further. Then make sure the lid is also locked by re-opening it and then closing it while pressing on the rubber arrow on top of the locking arm that holds the lid until you hear a click. Most people find that they can solve this issue after watching the video attached to this article.
2. If the instructions above and the video attached to this article do not help you, the heating element or other electrical element may be out of order. In this case, either the base or the whole product may need to be replaced. We can help you with this if you create a Support Ticket on this site.