[BUG] M109 turns off my extruder cooling fan

[dbuezas]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

The first call M109 turns off my extruder cooling fan.
Changing temperature through M104, or going below and again above my EXTRUDER_AUTO_FAN_TEMPERATURE doesn't turn it on again, only reset does.
Even M109 S0 turns it off regardless of the current nozzle temperaturee.
M109 R[temperature] has the same effect.

I can force the pin on with M42 P22 S255 I1, so it is not a weird wiring issue.

I also tried moving the fan to a different pin and the result is exactly the same.

Bug Timeline

I never noticed it before, and now i rolled back 2024-06-03 and it was already there.

Expected behavior

That fan should never turn off when the nozzle is > 50°

Actual behavior

Extruder fan turns off until next restart

Steps to Reproduce

M104 S52 ; Heat above 50°, which is where my extruder fan turns on
M109 S52 ; Fan turns off regardless of nozzle temp
Only a restart turns it on again.

Version of Marlin Firmware

Latest bugfix 2.1.x

Printer model

Ultimaker 2

Electronics

SKR3

LCD/Controller

SSD1309

Other add-ons

two MAX31865 (bed an nozzle) although lcd shows right temp and they worked well until now

Bed Leveling

ABL Bilinear mesh

Your Slicer

Other (explain below)

Host Software

Other (explain below)

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

Archive.zip

[dbuezas]

The rgb leds in the encoder are the culprit, probably a pin config issue