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Millermatic 175 no arc. No wire feed. Relay is switching

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  • aametalmaster
    replied
    Originally posted by Bunner View Post
    Did Replacing the relay work? I have the same problem with my challenger 172.
    So what exactly is your welder doing? Trigger wires do come loose i have fixed dozens of them over the years...Bob

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  • Bunner
    replied
    Did Replacing the relay work? I have the same problem with my challenger 172.

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  • cruizer
    replied
    stuck relay I guess

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  • Hgoody77
    replied
    Ok. I removed the gun completely. Used a jumper wire on the front panel conector. Same thing. I hear the relay and see the red led light. No motor signal for spool.

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  • Hgoody77
    replied
    Wire does not feed at all, weither its touching ground or not. Cr1 relay clicks and red led will come on with trigger squeeze.
    I will remove the complete gun, then test with jumper to see if it runs the spool motor at least.

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  • cruizer
    replied
    Does the wire feed at all without having the wire touch the ground clamp? personally id remove the gun altogether...

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  • Hgoody77
    replied
    Ok, i was able to test today. Left gun mounted at the feed wheel. Unhooked the connector at face of welder for the trigger. Turned welder on, let the wire touch the ground clamp and took jumper wire to jump out the terminals on the plug on the face of the welder. Same results. One relay clicks and red led lights up. No arc no feed.

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  • Hgoody77
    replied
    Thanks for that tip cruizer! I will give that a shot this weekend and report back.

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  • cruizer
    replied
    huh, no one mentioned that the trigger wires are likely shorting to the torch conduit... Paper clip the trigger terminals and see if the problem goes away...

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  • Hgoody77
    replied
    Well, my reply from miller.
    They willnot send me the board schematics because they still make the boards.
    But... They said they are very confident that replacing the three relays will solve my issue.
    I will for sure post a reply when i get this done. It won't be soon. But i will reply.

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  • Hgoody77
    replied
    I'm uncertain if I will get them or not. I asked for them though. No reply email yet.

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  • Aeronca41
    replied
    15 bucks is a cheap fix if if works; if not you're not out much. Sounds like Miller is giving you a board schematic diagram?

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  • aametalmaster
    replied
    Originally posted by ryanjones2150 View Post
    A lot of times, sitting up is far worse than running them hard.
    Just like a new car or truck...Bob

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  • ryanjones2150
    replied
    A lot of times, sitting up is far worse than running them hard.

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  • Hgoody77
    replied
    I received a response from Miller.
    They don't repair the circuit boards. But they told me a place that would. And they also said that they think from my description they recommend just replacing all three relays, CR1 CR2 CR3. They included a place to buy the relays. They are 5$ each. I asked for a circuit board schematic and i will probably go ahead and order the three relays and replace them.
    I really hope this will fix the issue.
    I have been very easy on this welder, it's had a easy life and for it to fail like this is crazy.

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