> Welcome to the science of fire. If you pump energy into a system faster than you are removing it then you are heating it up, if you pump energy out faster than you are adding it then you are cooling something down.

That's why I said "more temperature sensors". It's possible to design a relatively-standard dryer where no part ever gets above boiling, even when the output is completely blocked, giving you a huge margin of error.

Heat in a dryer is all externally applied. It can't build up on its own.