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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:

      e vss fuse issue. any idea how to identify and fix this?

      see if this thread helps? https://forum.duet3d.com/topic/15331/error-on-thermistors

      1 Reply Last reply Reply Quote 1
      • felixlvhundefined
        felixlvh
        last edited by felixlvh

        more details below; run some commands

        Heater 0 uses Thermistor sensor channel 0, last error: sensor open circuit, T:100000.0 B:3950.0 C:0.00e+0 R:4700.0 L:54 H:-97

        Heater 1 uses Thermistor sensor channel 1, last error: sensor open circuit, T:100000.0 B:4725.0 C:7.06e-8 R:4700.0 L:0 H:0

        Heater 0 model: gain 90.0, time constant 700.0, dead time 10.0, max PWM 1.00, calibration voltage 0.0, mode bang-bang, inverted no, frequency default

        Heater 1 model: gain 550.2, time constant 241.2, dead time 7.0, max PWM 1.00, calibration voltage 0.0, mode PID, inverted no, frequency default
        Computed PID parameters for setpoint change: P11.2, I0.272, D54.8
        Computed PID parameters for load change: P11.2

        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

        Board image : https://ibb.co/9n1mwS5

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        • A Former User?
          A Former User
          last edited by

          @felixlvh said in Heater Fault:

          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.

          https://www.google.com/search?q=test+fuse+multimeter

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          • felixlvhundefined
            felixlvh
            last edited by

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

            https://www.google.com/search?q=test+fuse+multimeter

            Hi @bearer thanks for your reply.

            I look closer to my board and found something is blown as screenshot. I am not sure if this is VSSA, can you point me to the right fuse?

            https://ibb.co/3FKtpV2

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            • A Former User?
              A Former User
              last edited by

              Which revision board is it?

              First picture is a fan output, looks damaged. (TR1 designates transistor, as in mosfet)

              Fuse should have been a fairly large 1206 smd part (3.6x1.6mm) in the second picture, fuses are designated Fn.

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              • felixlvhundefined
                felixlvh
                last edited by felixlvh

                Hi @bearer

                It should be 1.02. i searched around and found the vssa. assumed i am on the right fuse, the multimeter doesn't give me any reading. do i need to connect to power? thanks again!

                https://ibb.co/TYb2MNS

                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:

                  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.

                  1 Reply Last reply Reply Quote 0
                  • 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.

                    1 Reply Last reply Reply Quote 0
                    • 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?

                      1 Reply Last reply Reply Quote 0
                      • Turboundefined
                        Turbo
                        last edited by

                        This post is deleted!
                        1 Reply Last reply Reply Quote 0
                        • 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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