I started having a problem where my printer will never reach the target temp, just shy of it, almost always 10 degrees centigrade.

This has rendered my printer totally useless as it will not begin printing until it reaches its target temperature

I’ve replaced the driver board, the thermistor and heating element and the problem persists

Some searching online indicated that I should run a PID autotune but have not been able to get that to execute, either by putting the code into a gcode file and running it on the printer, nor sending it when connected to usb. Nothing seems to happen and no temperature change.

What can I do?