

Yes, even when the sensor fails.
If the feedback from the thermistor is either nonsense or doesn’t change as expected even when the heater is on/off for a certain time, that should trigger a thermal runaway error and halt the printer. That’s basic decade plus old Marlin code.
I’ve had two broken thermistors in my Ender 3. First one reported negative temperatures when it disconnected, so the printer immediately halted with a min temp error. The second reported something like 150C, which was in the acceptable range, except when it tried to heat it up and nothing changed for like 15 seconds, which triggered a halt.
Again, decade old marlin code. Not rocket surgery.




With how shit Google is these days, I kinda wonder if Yahoo could dust out their search engine from two decades back and it would just be… better.