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Thermistor Problems

Discussion in 'Troubleshooting' started by Cody Peterson, Oct 2, 2013.

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  1. Cody Peterson

    Cody Peterson New Member

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    When I started up repetier-host and connect the printer, the temperature readings are way off. It starts out at 250C even when it is completely cool. If I try to turn the heater on it won't do anything unless I set it above 250C. I used a thermocouple to check the temperature and it only gets to around 180C before the program says that it got too hot and shut off. Is there anyway to reset the temperature readings on the printer? Has anyone else had this problem and found a solution?
     
    #1 Cody Peterson, Oct 2, 2013
  2. tesseract

    tesseract Moderator
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    Hey Cody I will see what I can do to help exactly what have you done so far
     
    #2 tesseract, Oct 2, 2013
  3. Cody Peterson

    Cody Peterson New Member

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    I tried to reload the firmware but that didn't do anything. The thermistor for the bed works just fine and it heats up. I think it may be a bad thermistor. Is there a way to check if that works correctly?
     
    #3 Cody Peterson, Oct 3, 2013
  4. tesseract

    tesseract Moderator
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    can you attach some pics of what the nozzle looks like on the hot end form the differents sides I would like to compare
     
    #4 tesseract, Oct 3, 2013
  5. tesseract

    tesseract Moderator
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    also one of the main screen of repetier Host focusing on the bottom line where it displays the temps and things
     
    #5 tesseract, Oct 3, 2013
  6. Cody Peterson

    Cody Peterson New Member

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    2013-10-03 12.52.30.jpg 2013-10-03 12.53.49.jpg 2013-10-03 12.54.54.jpg 2013-10-03 12.57.35.jpg repetier.jpg
     
    #6 Cody Peterson, Oct 3, 2013
  7. tesseract

    tesseract Moderator
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    yeah I think your thermister is screwed up where are you located are you local
     
    #7 tesseract, Oct 3, 2013
  8. Cody Peterson

    Cody Peterson New Member

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    I am Utah so not very local.
     
    #8 Cody Peterson, Oct 3, 2013
    3 people like this.
  9. tesseract

    tesseract Moderator
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    better than europe or australia
    let me check on something
     
    #9 tesseract, Oct 3, 2013
  10. waffle_maker

    waffle_maker New Member

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    I am also troubled by the same problem maybe.
    It is displayed as 240 ℃ roughly in my case.
     
    #10 waffle_maker, Dec 3, 2013
  11. Cody Peterson

    Cody Peterson New Member

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    As soon as I replaced the thermistor mine worked just fine. If your temperature reads that high when you turn it on then that is probably the problem.
     
    #11 Cody Peterson, Dec 3, 2013
  12. tesseract

    tesseract Moderator
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    A high reading on the thermistor when it is off means you have short in the wiring very probably at the thermistor side
    If you have zero reading you have an open connections where a where has come loose(usually thermistor, plugs or connections)
    IF you can trouble shot maybe you could find the issue and resolve it sometimes its easy sometimes it is not
     
    #12 tesseract, Dec 3, 2013
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