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Thread: Help-0, thermistor isn't shorted. XMT 304

  1. #1
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    Help-0, thermistor isn't shorted. XMT 304

    I'm getting an occasional help-0 error (and no "thunk") when I switch this thing on. The service book says it's the thermistor RT2. I've checked the thermistor for proper resistance, and swapped it for a different one and still occasionally have the same issue. Usually I can turn if off and back on once or twice and then it'll turn on and work normally until the next time I try to use it. Any ideas or further troubleshooting I should do for the thermistor?

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    Glen

    Red-D-Arc EX300 (Miller XMT304)
    Hobart Champion 16
    Hobart Hefty CC/CV
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    Lotos LTP5000D

  2. #2
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    Re: Help-0, thermistor isn't shorted. XMT 304

    Looking again today I noticed some of the lugs are partially pulled out of the board.

    L1-1 and L1-2. Gonna fix these and see if it makes a difference

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    Glen

    Red-D-Arc EX300 (Miller XMT304)
    Hobart Champion 16
    Hobart Hefty CC/CV
    Hobart Handler 140
    Lotos LTP5000D

  3. #3
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    Re: Help-0, thermistor isn't shorted. XMT 304

    Fixed those lugs, still gave help 0 message at first power on, but then was fine the next couple times. Haven't had another chance to try it since

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    Glen

    Red-D-Arc EX300 (Miller XMT304)
    Hobart Champion 16
    Hobart Hefty CC/CV
    Hobart Handler 140
    Lotos LTP5000D

  4. #4
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    Re: Help-0, thermistor isn't shorted. XMT 304

    Once it fires up,,, leave it on,, ha

  5. #5
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    Re: Help-0, thermistor isn't shorted. XMT 304

    That's an idea, could leave the leads connected to discourage unwanted visitors to my shop too
    Glen

    Red-D-Arc EX300 (Miller XMT304)
    Hobart Champion 16
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  6. #6
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    Re: Help-0, thermistor isn't shorted. XMT 304

    What's the discoloration at the lead terminal circled in red?
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  7. #7
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    Re: Help-0, thermistor isn't shorted. XMT 304

    Dust and grime
    Glen

    Red-D-Arc EX300 (Miller XMT304)
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  8. #8
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    Re: Help-0, thermistor isn't shorted. XMT 304

    OK. I thought it looked like a bad crimp that has been arcing.
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save Second Base!

  9. #9
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    Re: Help-0, thermistor isn't shorted. XMT 304

    New clue: I noticed that whenever it decides to give the Help-0 code, it doesn't make the normal "thunk" noise. So I took the cover off and wiggled the connectors that go to the contactors. Tried again and one contactor "thunked" but the other didn't, and still had Help-0. So I took off all the connectors on the top circuit board and made sure they had a tight electrical connection. Tried it a few times since then and 100% working so far. Now for some serious testing!
    Glen

    Red-D-Arc EX300 (Miller XMT304)
    Hobart Champion 16
    Hobart Hefty CC/CV
    Hobart Handler 140
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