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    topic_unsolved heater cartridge degraded and "lost power"

    Tuning and tweaking
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    • c310
      c310 last edited by

      on my duetwifi i have used 24v 60w heater cartridge. it was easily heating up to 310 degrees, but yesterday it was hardly reaching 280.... i checked cables and re-calibrated with M303.
      No luck 😞

      in my understanding is that heater either works or not. it can not degrade...

      am i right?
      and where else should i check to fix the issue?

      thanks!

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      • Veti
        Veti last edited by

        measure the resistance of the heater.
        then calculate its power from that.

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        • dc42
          dc42 administrators last edited by

          Check all connections between the heater and the Duet. Also check the connections between the PSU and the Duet.

          If you did any work on the hot end between the heater working and not working fully, check that there is a gap between the bottom of the heatsink and the top of the heater block.

          c310 1 Reply Last reply Reply Quote 0
          • deckingman
            deckingman last edited by

            ,........and check your power supply. M122 will show you the min and max voltage - check that you have 24v when the heater(s) is/are on.

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            • c310
              c310 last edited by

              it is 19 Ohms, that gives 30W... that gives half of what it should be 😞

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              • dragonn
                dragonn last edited by

                This can happen. Actually you are lucky, sometimes can happen that a heater gets a short and just burns out destroying fuses or cables/connectors with it.
                Just replace it.

                c310 1 Reply Last reply Reply Quote 0
                • c310
                  c310 @dragonn last edited by c310

                  VIN was between 24.5 and 25.0 volts , all cables and connections were in a good shape..

                  finally, i have replaced it...
                  and new one works as it should be 🙂

                  thank you all for support!

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                  • c310
                    c310 @dc42 last edited by

                    @dc42 it had happened again 😞 are there any parts on the Duet WiFi board that potentially have degraded?

                    dc42 1 Reply Last reply Reply Quote 0
                    • Phaedrux
                      Phaedrux Moderator last edited by

                      Would seem strange that any degradation on the duet would get better when replacing the cartridge though, wouldn't it?

                      60W cartridge would be quite powerful. Perhaps the life expectancy is shorter than a regular 30w.

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                      • dc42
                        dc42 administrators @c310 last edited by

                        @c310 said in heater cartridge degraded and "lost power":

                        @dc42 it had happened again 😞 are there any parts on the Duet WiFi board that potentially have degraded?

                        The only things I can think of that might have degraded in a way that reduced output power are the soldering of the heater output connector to the PCB, and the soldering of the main VIN fuse holder to the PCB. If those joints are bad, the problem should be easily visible.

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