@StevePS3 said in Extruder fan permanently spinning:
; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S0 H1 T45 ; set fan 1 value. Thermostatic control is turned on
; Tools
M563 P0 D0 H1 F0:1 ; define tool 0
Where do you have your fans actually connected?
Your tool has defined fan0 and fan1 as the tool fan. If fan1 is the hotend heatsink fan, then you don't want fan1 assigned to the tool as well.
Change M563 P0 D0 H1 F0:1 to be M563 P0 D0 H1 F0