I am trying to print using PLA with the Hot End temperature set at 210 and the bed set at 60.

Recently the temperature seems to have gone crazy, the filament has started to smoke and the EO Temperature is showing at 275/210.

Judging by the smell of overheating and the crap print quality it looks as if whatever component that is supposed to be turning off the hot-end heater is malfunctioning (both of the fans in the hot end housing seem to be doing what they always did).

Does anyone know how to resolve this?