@blitzreg said in PID problems:
@phaedrux Why is it saying Heater 0 when the fault happens on heater 1 the extruder? Not sure what is happening here!
I think that is a bug in the displayed heater. Please update to 3.4.1 RC1
https://github.com/Duet3D/RepRapFirmware/releases/tag/3.4.1rc1
What did your tuned values result in?
If the part cooling fan doesn't have a big impact on the heater, you can tune the hotend as a normal heater with M303 H1 S240 and see if it behaves better.