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    Error: Temperature reading fault on heater 0

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    Duet Hardware and wiring
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    • A Former User?
      A Former User
      last edited by A Former User

      Check the (sensor) wiring, and which Duet is it?

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      • giostarkundefined
        giostark
        last edited by

        When I saw this message on my printer I had not good contact between some pins. I use the multimeter for check if the cables were open and whey were. (in that case they touch yes and no). To fix the contact make that 2000 disappear. Maybe vibration moved them a little? Did you Inadvertently maybe touched them?

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        • felixlvhundefined
          felixlvh
          last edited by

          pretty sure it's not wiring issue. its duet web

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          • felixlvhundefined
            felixlvh
            last edited by

            i read about some posts it could be vss fuse issue. any idea how to identify and fix this?

            A Former User? 1 Reply Last reply Reply Quote 0
            • giostarkundefined
              giostark
              last edited by giostark

              I found this that should be where you lies at this point:
              https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_VSSA_fuse
              But right now I'm not capable enough to give suggestions 😕

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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

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                • 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.

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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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