Is it possible the TM5 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 What if a TM5 does not heat food quickly or at all? Thermomix® sells mixing bowls in many countries around the world. Does a non US mixing bowl work in the US version of the TM5? My Thermomix® TM5 mixing bowl has a rainbow-colored shimmer Bread: Pay Over Time step by step How Can I Setup my Cookidoo and ®Cook-key®?