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Ed would
Dunno.
Everything you say seems correct to make it work on variable speed
Is it standard Marlin? Is the board defined as MOTHERBOARD BOARD_RAMPS_14_EFB?
Faulty fan, or not 12v . . . ?! Running out of ideas.
Its the version of Marlin pulled from Nopheads github. Should I try to use standard Marlin?
Fan works fine at full speed but cannot adjust speed. 12v measured across fan terminals while powered.