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    Heater turned on unexpectedly

    Duet Hardware and wiring
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    • MortarArt
      MortarArt last edited by

      Not more than 5 minutes ago, my idle printer's hot end fan turned on, and I went over to check why. I was at the time not connected to the network that it's on, and at first the duet display showed both thermistors at room temperature, so I put my finger close and confirmed that the heater block was in fact hot. After doing this and looking down, the temperature now read ~150c and climbing. So I logged on to the Duet web control, and saw it at about 230c, with Active set to 0, and Standby set to 240c. I set standby to 0, and it peaked at 245c, before falling.

      I don't know what happened, but this is very concerning to me.

      I often leave my printers on, ableit inactive, when unattended, and the prospect that one of them might suddenly set themselves to heat up is dangerous for obvious reasons. I'll cease doing that for now, but I'd like to know if this is a known behaviour.

      Firmware version; 2.02(RTOS) (2018-12-24b1)
      Firmware Electronics: Duet WiFi 1.02 or later
      WiFi Server Version: 1.22
      Web Interface Version: 1.22.6

      deckingman 1 Reply Last reply Reply Quote 0
      • deckingman
        deckingman @MortarArt last edited by deckingman

        @MortarArt As you say, that behaviour is concerning. No doubt someone more knowledgeable than I will post a reply but in the meantime, you might do what I do and that is put G10 Pn R0 S0 (where n is tool number) in config.g, and your slicer end gcode, and any cancel.g macros. That will ensure that the active and standby temperatures are always set to zero other than when printing. It doesn't resolve your issue but it should help to mitigate it.

        Ian
        https://somei3deas.wordpress.com/
        https://www.youtube.com/@deckingman

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        • MortarArt
          MortarArt last edited by

          Good idea. It's possible there was some kind of power fault and the printer reset to that state. But normally standby is 0. The last job I did was in ABS, at 240c so that's where the standby temp came from.

          dc42 1 Reply Last reply Reply Quote 0
          • jay_s_uk
            jay_s_uk last edited by

            Also, think about updating the firmware to the last stable RR2 release

            Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

            MortarArt 1 Reply Last reply Reply Quote 0
            • MortarArt
              MortarArt @jay_s_uk last edited by

              @jay_s_uk yeah, I will do. But I'll wait until someone from Duet3D replies in case they want to run some tests to check things.

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

                @MortarArt said in Heater turned on unexpectedly:

                Good idea. It's possible there was some kind of power fault and the printer reset to that state. But normally standby is 0. The last job I did was in ABS, at 240c so that's where the standby temp came from.

                Unfortunately most slicers don't understand firmware that supports active/standby temperatures, so they use M104 or M109 to set temperatures, which sets both. If the slicer doesn't reset them with M104 S0 at the end, it will leave the temperatures set.

                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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                • MortarArt
                  MortarArt last edited by

                  Yes, but what I don't understand is why the printer decided to turn on the heat to the standby temperature. It was completely idle.

                  droftarts 1 Reply Last reply Reply Quote 0
                  • droftarts
                    droftarts administrators @MortarArt last edited by

                    @MortarArt From your initial description, you have a PanelDue connected? Could something have pressed the screen, just in the right place to turn on the heater to standby? It's quite sensitive.

                    Ian

                    Cartesian bed-slinger with Duet 3 Mini 5+ WiFi : RRP Fisher Delta v1 with Duet 2 Maestro : TronXY X5S with Duet 2 Wifi (in progress)

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                    • MortarArt
                      MortarArt last edited by

                      Maybe an insect? The room was otherwise still enough for me to hear the fan turn on.

                      droftarts 1 Reply Last reply Reply Quote 0
                      • droftarts
                        droftarts administrators @MortarArt last edited by

                        @MortarArt Maybe interference? It's a tough one to diagnose, and as far as I know, no one else has reported anything similar.

                        Ian

                        Cartesian bed-slinger with Duet 3 Mini 5+ WiFi : RRP Fisher Delta v1 with Duet 2 Maestro : TronXY X5S with Duet 2 Wifi (in progress)

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