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    Toolboard V1.2 Heater 1 fault: failed to read sensor: bad Vssa

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    • CR3Dundefined
      CR3D
      last edited by

      Dear Community,

      I have some problems with an Toolboard.

      after everything worked initially, a heater fault was displayed from one moment to the next. A Phaetus Rapido HF Hotend is installed.

      203598b9-32fc-43bb-941b-6cc56cb0f2da-image.png

      IMG_20220501_181027.jpg

      24f6a9d1-0585-4b91-ba2f-618b645ac935-image.png

      Following Error Message:
      Error: Heater 1 fault: failed to read sensor: bad Vssa

      I disconnected the heater and thermistor and also used the second thermistor channel. No chance.

      Here is the M122 B20:

      8290d665-de8d-479b-a763-2fb6a51f8bfd-image.png

      I've reset the board and reinstalled the firmware. RRF 3.4.0 is used

      Do you have any idea?
      Is the Toolboard faulty?

      Regards Christian

      Christian from CR-3D
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      oliofundefined dc42undefined 2 Replies Last reply Reply Quote 0
      • oliofundefined
        oliof @CR3D
        last edited by

        @cr3d that photo is way too unclear regarding heater and thermistor wiring to make any call. Have you tried swapping the toolboards between the two tool heads?

        <>RatRig V-Minion Fly Super5Pro RRF<> V-Core 3.1 IDEX k*****r <> RatRig V-Minion SKR 2 Marlin<>

        CR3Dundefined 1 Reply Last reply Reply Quote 0
        • dc42undefined
          dc42 administrators @CR3D
          last edited by dc42

          @cr3d I've seen this problem once before. If there is a short between the hot end heater and the ground side of the thermistor, then the VSSA fuse is supposed to protect the board. Unfortunately, the 10 ohm resistor R47 may blow before the VSSA fuse kicks in. So if you have a multimeter, I suggest you check resistor R47.

          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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          • CR3Dundefined
            CR3D @oliof
            last edited by

            @dc42 thank you i will check the resistor 🙂

            Christian from CR-3D
            Homepage:
            www.cr-3d.de

            Facebook:
            https://www.facebook.com/cr3d.official

            Our Discord Server
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            https://www.thingiverse.com/cr-3d_official/about

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