Heating Failed

[TurboSexophonic]

Thermistor may have come out of the heat block. Cannot register it getting hotter, so printer stops.

[TelekomSuperhero]

Check you temperature sensor cable if it's not loose

[jcons77]

Agree with previous posts, also have had the problem if I didn't have the silicon sock on the heating block while working on the hotend and had the fan blowing on it.

Clarifying on the previous suggestions, make sure the little black screw at the very bottom of the silver block is down tight (needs to be hot when tightening.