Quote
marnargulus
I wouldn't worry about them unless you are trying to do the reverse (turn the fan on or maintain the current temp setting)
That is what I am doing i.e. altering the temp in the g-code but I just realised I can put in M104 S0 to negate the effect anyway.
M104 S0 ; negate default
G28 ; home all axes
M190 S45 ; set bed temp & wait
M140 S55 ; set final bed temp
M104 S190 ; set extruder temp
M116 ; wait for both temps to be reached