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@Laszlo-Kozik is this new from RRF 3.5b2 firmware? can you confirm if they still work if you switch back to 3.4.5?
Ah I see. Well some PWM fans don't seem to allow for a true off.
Can you test it as a simple two wire connection and use the Duet PWM and see if it will turn off completely? You lose the tachometer read out though.