Heater over and undershoots

[schneik80]

I recently have had issue with my hot end thermistor.
I have replaced the thermistor and the wild temperature readings have been fixed. But…
After tuning i get more fluctuation in temperature than prior to the problems. Any tips to calm down the sign wave temperature over and undershooting?

[dc42]

If the temperature oscillates above and below the target temperature, increase the D parameter in the M307 command. Try a 50% increase.

If the temperature doesn't oscillate but it overshoots the target temperature during initial heating, increase the A parameter. If it undershoots during initial heating, reduce the A parameter.

HTH David

[schneik80]

Thanks. After PID Tuning a second time and setting a larger D value, the fluctuation has been fixed.