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I'm a bit confused by this and I'm trying to figure this out. Maybe someone can help me out.
Anyway, the temperature reading for the extruder on my Maker Select V2 seems to hovering around 250C: http://i.imgur.com/1kLIPxx.jpg?2 ... it shows this very moment I boot up the 3D printer.
Prior to this, I had a colossal accident that resulted in me in replacing the heater block, heater core, thermistor, and hot end. Simply put, I didn't screw in the nozzle all the way when I replaced it, and after a while, a gigantic ball of filament got all over the wires of the heater core. After removing the excess filament, it seemed the cables to the core and thermistor broke off. Figured I'd just replace the whole assembly.
After acquiring spare parts to replace everything that broke, it seemed that the extruder temperature is spitting out an erroneous reading of a 250C. Everything is mostly OEM/Stock except for the hot end, which is a Micro Swiss all-metal hot end instead of a PTFE lined hot end (something I was meaning to pick up anyway).I'm not really sure what's causing this and maybe you guys can figure it out.
I also posted this issue on /r/3DPrinting but I didn't get much feedback there: https://www.reddit.com/r/3Dprinting/comments/6kcipy/extruder_temp_stuck_at_250_c_how_to_fix_it/
I think I have a solution to your problem:
When you replaced the thermistor, you replaced it with a different one, correct?
You need to calibrate the computer of the 3d printer to work with the new thermistor.
To do this, you will need to do a lot of work, so I recommend getting a 4950 100k thermistor.
If this doesn't work, your 3d printer's melzi board is broken.