Check your outlet. Ensure that the Motor Base is plugged in properly. Check that the Work Bowl is properly attached to the Motor Base. The Work Bowl will audibly “click” when it is securely attached to the Motor Base. Check that the arrows on the Work Bowl Lid are aligned with the arrows on the Work Bowl. 

If the other possibilities are determined not to be the issue, it’s likely that the unit’s thermal breaker was engaged. Allow the unit to cool for at least 30 minutes before attempting to use again.