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    Duet WiFi board open circuit on hotend

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    Duet Hardware and wiring
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    • duncan-rtfmundefined
      duncan-rtfm
      last edited by duncan-rtfm

      Hi,
      My Duet Wifi board seems to work brilliantly. Stepper motors move as expected, homing works, end stops work. Everything moves almost silently. Couldn't be happier.

      HOWEVER, no matter what I do I get an "open circuit" error whenever I connect the hotend wiring. I've bought and tried three different hotend/thermister sets. Still the same error. In frustration I bought another board (a Maestro) and wired that one up - and the hotend works wonderfully. Really impressed. Without touching the wiring on the printer itself, I wired up the WiFi board (power and hotend) and the same issue - "open circuit".

      Any suggestions?

      Regards

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      • dc42undefined
        dc42 administrators
        last edited by

        Please post your config.g file and let us know what thermistor you are using.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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        • duncan-rtfmundefined
          duncan-rtfm
          last edited by

          Hi,
          Here's my config.g file, together with a pic of the bag the thermister came in.
          config.g

          20191001_050740.jpg

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          • dc42undefined
            dc42 administrators
            last edited by dc42

            Here's the problem, in config.g:

            M305 P0 T9880 B4185 R4700

            Change to: M305 P0 T100000 B3950

            Similarly for the M305 P1 command. The B3950 is just a guess because the bag doesn't give the B value.

            Duet WiFi hardware designer and firmware engineer
            Please do not ask me for Duet support via PM or email, use the forum
            http://www.escher3d.com, https://miscsolutions.wordpress.com

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