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I have H21 code problem on Miller Big Blue 400 x Pro

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  • Weld dr
    replied
    You have a thermal device in IGBT module MOD-1/MOD-2 check the wiring going to PC1 If wiring is good replace MOD. Make sure you have some knowledge of the inside workings before you start testing the unit does not have to be running for this test. hopefully it not the mod kit they run around
    $ 2,000

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  • Kpack
    replied
    This is out of my bobcat manual, you should have something like it Click image for larger version

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  • Kpack
    replied
    You’ll have to look on the Miller site for your manual, you’ll need your serial number.
    I’m not the best to give advice but I would start with easy stuff like a fuse somewhere in the weld circuit. I’m not sure but hopefully the there’s two fuses, one for weld and one for ac electric output.

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  • I have H21 code problem on Miller Big Blue 400 x Pro

    Hello, I need your help, I have H21 code problem on Miller Big Blue 400 x Pro, No welding output; the power
    of the generator is correct at the
    AC current.
    Please if anyone have the solution I would be grateful.
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