Hotend and hotbed always on

[san_dro]

Hi all,
I just wired my duetwifi and I have a problem.
As soon as I give power to my board both hotend and hotbed get power and start to heat. Is there something I've to check?

[DocTrucker]

Check to ensure neither circuit has a short to VIN negative and polarity for VIN, but would have thought a polarity error on VIN would have given other symptoms.

Edit; recheck all wiring and if you can't find anything wrong try the board with no heaters connected.

[san_dro]

Thanks, I'll give it a try

[dc42]

Also check that the back of the Duet is not shorting against anything underneath it, and that the green 3.3V LED is illuminated.