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    Heater Fault

    Scheduled Pinned Locked Moved
    Duet Hardware and wiring
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    • pcsentinelundefined
      pcsentinel
      last edited by

      Hi, My DuetWifi is showing a permanent fault on heater 1 as per the attached PNG. I have measured the resistance of the heater 1 thermistor and it reads 159kOhm. Just in case, also checked the heater 2 thermistor which is showing 157KOhm and the Bed which is showing 158KOhm
      The above measurements were taken at the board end of the cables.

      I have attached diagnostic and setup files.
      0_1557818692969_k8200duet fault.PNG
      1_1557818613624_K8200Duet Fault Diag.txt 0_1557818613624_K8200Duet Fault config.txt

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      • Vetiundefined
        Veti
        last edited by

        post your config

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        • pcsentinelundefined
          pcsentinel
          last edited by

          I have, its linked in the message under the picture.

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          • Vetiundefined
            Veti
            last edited by

            the config looks ok.
            did the temperature work before?

            you are running a very old version of the firmware (1.2) consider updating to the current version 2.02

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            • pcsentinelundefined
              pcsentinel
              last edited by

              Everything has been working fine for a long time, I was printing fine yesterday, but after the print had ended this fault just presented itself. I have obviously tried switching the unit on and off multiple times, but it always comes up with the error. I know the FW is old, but since its been working fine, I don't think its related

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              • Vetiundefined
                Veti
                last edited by

                could be a blown vssa fuse.

                dc42undefined 1 Reply Last reply Reply Quote 0
                • Vetiundefined
                  Veti
                  last edited by

                  disconnect all and connect one at a time to rule out shorting of the vssa line.

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                  • dc42undefined
                    dc42 administrators @Veti
                    last edited by dc42

                    @veti said in Heater Fault:

                    could be a blown vssa fuse.

                    Yes, if your Duet is a revision 1.0 or 1.01 then with power off, use a multimeter to measure the resistance between VSSA on a thermistor pin and GND on an endstop pin. It should read no more than a few ohms. If instead it's very high, the VSSA fuse has blown, which will make all thermistors read 2000C.

                    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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                    • pcsentinelundefined
                      pcsentinel
                      last edited by

                      Its a V1.01 board and that measurement is 60KOhm so guess the fuse has blown

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

                        @pcsentinel said in Heater Fault:

                        Its a V1.01 board and that measurement is 60KOhm so guess the fuse has blown

                        Yes. Find and fix the short between thermistor wiring and something else that probably caused it to blow, then see https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_VSSA_fuse for how to replace or bypass the fuse.

                        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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                        • pcsentinelundefined
                          pcsentinel
                          last edited by

                          Thanks for your help, have now applied full resettable fuse and 10K resistor fix. Funny though as could not find original fault.

                          Whilst fixing I have also recognised a further issue but as is unrelated I have created a new thread.

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                          • felixlvhundefined
                            felixlvh
                            last edited by felixlvh

                            Hi @dc42, i have the same issue as mentioned above. can you eleborate how can i use a multimeter to verify if i have vssa fuse blown? i am pretty sure all wiring are ok and now i am getting open circuit error message. thanks a ton!

                            FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.05.1 ELECTRONICS: Duet WiFi 1.0 or 1.01 FIRMWARE_DATE: 2020-02-09b1

                            @dc42 said in Heater Fault:

                            Yes, if your Duet is a revision 1.0 or 1.01 then with power off, use a multimeter to measure the resistance between VSSA on a thermistor pin and GND on an endstop pin. It should read no more than a few ohms. If instead it's very high, the VSSA fuse has blown, which will make all thermistors read 2000C.

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