Our Dyson DC07 has Same Problem.
I have removed Intake Washable Filter & Output Hepa Filter & Dust Collection Assembly & Motor runs longer, but Runs Very Hot & Eventially Still Trips Out on Thermal Protection Switch.
This tells me that the Filters & Collection Assembly would contribute to Faster OverHeating, but are NOT the Primary Cause of the Motor OverHeating.
I'm ready to Remove the Entire Motor Assembly, but that looks Formidable.
Any More Suggestions, Please..
Leo & Joyce in Mississippi
Leo & Joyce
November 2007