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    Hotend heater showing 695

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    • mrenz999undefined
      mrenz999
      last edited by

      Duet 3 using RRF 3.2 RC2
      I replaced my heater cartridge and thermistor. Using the same brand as I was using before. My heater faults and shows 695 degrees.
      Relevant section of Config.g

      ; Heaters
      M308 S0 P"temp0" Y"thermistor" T100000 B3950 ; configure sensor 0 as thermistor on pin temp0
      M950 H0 C"out0" T0 ; create bed heater output on out0 and map it to sensor 0
      M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
      M140 H0 ; map heated bed to heater 0
      M143 H0 S120 ; set temperature limit for heater 0 to 120C
      M308 S1 P"temp1" Y"thermistor" T100000 B3950 ; configure sensor 1 as thermistor on pin temp1
      M950 H1 C"out1" T1 ; create nozzle heater output on out1 and map it to sensor 1
      M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
      M143 H1 S300
      M307 H0 R0.276 C683.100:683.100 D0.20 S1.00 V24.1 B0
      M307 H1 A351.2 C120.5 D7.2 S1.0 V24.1 B0

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        Are you sure it's the same as the one it's replacing?

        Does it show that temp right at power on when it's cold?

        3.2 final is available now by the way. https://github.com/Duet3D/RepRapFirmware/releases/download/3.2/Duet2and3Firmware-3.2.zip

        Z-Bot CoreXY Build | Thingiverse Profile

        mrenz999undefined 1 Reply Last reply Reply Quote 0
        • Vetiundefined
          Veti
          last edited by

          please measure the resistance of the thermistor.

          its possible you bought a pt100 rather than a b 3950

          mrenz999undefined 1 Reply Last reply Reply Quote 1
          • mrenz999undefined
            mrenz999 @Phaedrux
            last edited by

            @Phaedrux I will upgrade to the final. It shows the crazy temp at bootup. So right away with no heater on and then of course faults right away. It is the same as I was using before for sure. So not sure what happened. Unless they put a different one that looks the same in the same package. I have others and will swap it out tonight when I get home.

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            • Vetiundefined
              Veti
              last edited by

              @mrenz999 said in Hotend heater showing 695:

              Unless they put a different one that looks the same in the same package

              you really need to measure the resistance

              mrenz999undefined 1 Reply Last reply Reply Quote 0
              • mrenz999undefined
                mrenz999 @Veti
                last edited by

                @Veti Will do that tonight when I get home. On a side note I changed the T to 10000 and it cut the temp showing to 255. So maybe you are right on that.

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                • mrenz999undefined
                  mrenz999 @Veti
                  last edited by

                  @Veti Not sure how to test it. I do have a multi meter. Do I disconnect it and test the 2 leads ?

                  Vetiundefined 1 Reply Last reply Reply Quote 0
                  • Vetiundefined
                    Veti @mrenz999
                    last edited by

                    @mrenz999
                    yes disconnect and measure the resistance

                    1 Reply Last reply Reply Quote 0
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