# Is nozzle no longer heating up correctly related to hotend insulation being pulled off?

The insulation of the heater block got pulled off...

I was trying to print ABS on my TEVO Tornado, overnight. But I not-so-smartly left the window open overnight, thinking it was alright (as to remove the fumes) but then it warped so much that it pulled off the insulation of the hotend.

It is no longer heating up to over 200 degrees Celcius. It starts showing a message saying PRINTER HALTED: PLEASE RESET Should I just re-insulate it? if I should, what do I use for insulation?