@aceycv8 said in FW Bug? Heatbreak Fan thermostatic Control issue:
I've upgraded to 3.4.1 however my heatbreak fan will now run at full speed and i can't lower the speed.
The M106 S parameter is now ignored when a fan is configured as thermostatic. This is documented in the release notes for one of the releases you upgraded to or skipped. You can still use the maximum PWM parameter to limit the speed in thermostatic mode.