Wont heat past 30 degrees

³ in 1 original snapmaker wont heat past 30 degrees before resetting to 0 degrees

Possible bad heater in the hot end.

Or bad heated bed or toolhead-cable or heated bed-cable…

ditto @xchrisd answer. i had a cable that got trapped/pinched by the bed. many movements later a wire broke. couldn’t see it. had to cut the rubber to find it