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    Error: Temperature reading fault on heater 0

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    • A Former User?
      A Former User @felixlvh
      last edited by

      @felixlvh said in Error: Temperature reading fault on heater 0:

      do i need to connect to power

      no, it should measure as close to 0 ohm when its ok, but it can be tricky to pierce oxide layer on old solder joints. You could repeat the measurement between Vin- and both pins on the thermistor input (one of them should be close to 0 ohm if the fuse ok)

      Looks to be the right part, but smaller on rev 1.2.

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      • felixlvhundefined
        felixlvh
        last edited by felixlvh

        @bearer said in Error: Temperature reading fault on heater 0:

        no, it should measure as close to 0 ohm when its ok, but it can be tricky to pierce oxide layer on old solder joints. You could repeat the measurement between Vin- and both pins on the thermistor input (one of them should be close to 0 ohm if the fuse ok)

        Looks to be the right part, but smaller on rev 1.2.

        Thanks @bearer , in this case i don't think my vssa fuse is blown.

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        • felixlvhundefined
          felixlvh
          last edited by

          @dc42 @bearer

          i have tried to disconnect all wires to isolate the issue. i am plugging in the extruder heaters e1, extruder thermistors, bed thermistor, heated bed still showing the same error. do you think is should get a new board?

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          • Turboundefined
            Turbo
            last edited by

            This post is deleted!
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            • A Former User?
              A Former User
              last edited by

              if you measure the resistance across the two pins of the thermistor plug, when its not connected to the board wht do you get?

              felixlvhundefined 1 Reply Last reply Reply Quote 0
              • felixlvhundefined
                felixlvh @A Former User
                last edited by

                @bearer said in Error: Temperature reading fault on heater 0:

                not connected to the board wht do you get?

                @bearer , i got reading 80.3K

                A Former User? 1 Reply Last reply Reply Quote 0
                • A Former User?
                  A Former User @felixlvh
                  last edited by

                  @felixlvh said in Error: Temperature reading fault on heater 0:

                  80.3K

                  config says its a 100k thermistor so it should be about right

                  maybe you should connect vssa directly to ground on a unused thermistor input now that you have nothing else connected; power from usb and see if that makes a difference

                  felixlvhundefined 1 Reply Last reply Reply Quote 0
                  • felixlvhundefined
                    felixlvh @A Former User
                    last edited by

                    @bearer Thanks, i am still uncertain about the vssa fuse. if you see the image here, https://ibb.co/TYb2MNS i got reading 90.9K. i can now confirm board is v1.01.

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                    • A Former User?
                      A Former User
                      last edited by A Former User

                      you should get pretty much 0. (or at least single digit ohms)

                      if you have a wire handy, run it as shown here, connect the thermistor to e0 or bed and power from usb.

                      1758b6d1-6087-4aab-90aa-29698c5a34e8-image.png

                      (it'll bypass the fuse, which should be safe when only the thermistor and usb is connected)

                      edit: seems the 1.02 board do not have a resettable fuse
                      https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_VSSA_fuse

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                      • felixlvhundefined
                        felixlvh
                        last edited by felixlvh

                        @bearer said in Error: Temperature reading fault on heater 0:

                        vssa directly to ground

                        @bearer If i did it correctly, It still shows the same error 2000'C

                        error.jpg

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                        • A Former User?
                          A Former User
                          last edited by

                          you've got the thermistor connected to e1 and configured for e0? move it to e0?

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                          • felixlvhundefined
                            felixlvh
                            last edited by

                            @bearer said in Error: Temperature reading fault on heater 0:

                            configured

                            @bearer OMG, E0 works!

                            e0.jpg

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                            • A Former User?
                              A Former User
                              last edited by A Former User

                              so you need a new fuse, ref the wiki link above.

                              edit; and you probably have to remap or repair fan2 as well.

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                              • felixlvhundefined
                                felixlvh
                                last edited by

                                @bearer am i right to say usign external fuse like this? can i still print by bypassing it temporarily? thanks a ton!

                                external fue.jpg

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                                • A Former User?
                                  A Former User
                                  last edited by A Former User

                                  if the pins read vssa and gnd, then yes. (also very low value fuse, less is better, wiki says "between 125 and 250mA and a resistance of between 2 and 4 ohms.")

                                  you can print with a bypass either a wire instead of the fuse, or like you tested - BUT there is likely a reason the fuse blew and the fan blew - your fan and thermistor have likely shorted on the hotend; and if it happens again with no fuse the CPU will likely be damaged.

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