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 My TM5 is showing an error code, what does this mean? Is it possible for food to burn and stick on the bottom of a Thermomix® mixing bowl? How can I update the software on my Thermomix ® TM5? What if a TM5 does not heat food quickly or at all? I am an active duty service member and live at an APO address. How can you fix my Thermomix®?