Is it possible my Thermomix® could have trouble heating food if it is overloaded with a lot of ingredients or frozen ingredients? Yes. Colder and larger quantities of food may require more time to heat. Related articles Where can I learn more about caring form my Thermomix®? Important Safeguards for Thermomix® TM5 What is the Thermomix® warranty included with purchase? What does error code C561 mean?