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Answered Hot End Temperature Fell

Discussion in 'Troubleshooting' started by BHWeaver, Dec 28, 2017.

  1. BHWeaver

    BHWeaver New Member

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    This is a brand new printer, right off the bat I was getting the Hot end temperature fell error and max and min temp errors. I discovered that the thermistor was shorting out, I have replaced the thermistor and attempted to run the printer I no longer have min or max temp errors now but I am still getting the Hot End Temperature Fell error, I have tested the wires; wiggled jiggled and pulled and not a blip on my tester but as I try to print I still get the error. I am running the Matter Control software and am controlling the printer via usb.
     
    #1 BHWeaver, Dec 28, 2017
  2. BHWeaver

    BHWeaver New Member

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    Forgot to add that I am also seeing the temperature jump around, for example when preheating the hot end the temperature fell from 104 degrees to 100 and then suddenly jumped to 140.
     
    #2 BHWeaver, Dec 28, 2017
  3. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    #3 mark tomlinson, Dec 28, 2017
  4. BHWeaver

    BHWeaver New Member

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    Like I said I tested the wiring and thermistor, and I have now disabled all the fans and I still have the same problem. Sometimes just after calibration and sometimes a minute or so into the print.
     
    #4 BHWeaver, Dec 28, 2017
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Well the only thing that will raise that error is the firmware seeing the temperature momentarily drop ... period.
    So something is making that happen and 99% of the time it is the thermistor itself. The only POSSIBLE problems are:

    1) bad thermistor or bad wiring/connections to it (loose ones will cause this)
    2) the RAMPS board that interfaces to all the I/O
    3) the arduino computer

    That is it.

    Remember that the firmware sees the temperature data "live" or near real-time and the printing software is always somewhat delayed by the serial communications. Even though you do not SEE the temperature change in the UI because of a sudden spike/drop due to a bad connection, the firmware will.
     
    #5 mark tomlinson, Dec 29, 2017
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    The reason you see it when you do is that is when the printer is getting started actually printing and there is a lot of movement on the extruder and the extruder platform. All of the wires are moving a bit and a bad connection will pop up right about then.
     
    #6 mark tomlinson, Dec 29, 2017

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