3D Printing Forum

The temperature plays a lot, I changed the circuit board, heaters and temperature sensor, but the problem remains. Does anyone have any idea what could be the cause. Thanks in advance. Ender 3 PRO printer.
If you want I can upload a short video. The temperature rises very quickly and much more than the set by 50C more and falls by a lot so the printer does not work.

Did you run a PID Autotune? If this hasn't been set, your firmware can have a hard time getting to and maintaining temperature.

https://teachingtechyt.github.io/calibration.html#pid