I would recommend ordering replacement heater and temp sensors, because it sounds like you are not going to be able to remove them.
Check this posts, they might have the solution:
https://ultimaker.com/en/community/view/8374-temperature-sensor-stuck-um2
https://ultimaker.com/en/troubleshooting/view/16657-how-do-i-replace-the-temperature-sensor
I've tried hex tips and torx tips (torx gives a better grip inside the screw), as well as vice grips and heating the block at various temps. Found some acetone to dissolve any PLA remains, but didn't seem to help
I'm guessing I'll end up having to replace the heater and temp sensor as well, but that just isn't right. Poor engineering.
Worse case scenario I think I readed that you could 'drill' the block from the other side (carefully I suppose) and then you could hammer-time the sensor to make it exit without breaking the cable.
Poor engineering.
Yep.
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gr5 2,224
Wow. How about vice grips? You should have used metric hex wrench - it's .5mm smaller than all the other screws - I think 1.5mm instead of 2mm for the other screws.
Anyway I would try vice grips with the nozzle at 150C.
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