I have searched but I'm probably not using the right search terms as usual. Duet 0.8.5 on recent firmware, I think DC42 1.13

"M106 P1 S(0-255)" with P1 for F1 still only controls F0

Any suggestions appreciated, many thanks.

M106 P0 S(0-255) will control FAN0, and M106 P1 S(0-255) will control FAN1. However, FAN1 is in thermostatic mode by default. If you want to use it as a normal controllable fan, you need to disable thermostatic mode by sending M106 P1 H-1.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

OK, thanks!