Kempotig 250 AC/DC wont start

  1. d.geertsma New Member

    Messages:
    3
    Location:
    Netherlands
    Hi everyone,

    Iam new to this forum but already have a question :)

    I have a kempotig 250 ac/dc tig welder that always worked fine. Now i have not used it for a while it wont start anymore. When i press the start button gas flows (i also hear the relay of gas clicking) but it wont start (high frequent start as well as strike start).

    Also there is a light burning of H7 it says in the manual, "pressure guard", so i thought my water pressure measure gauge was broken, but it was already connected true (see picture).

    I already checked the 3 circuits in the picture, but i cannot find a visual defect on any of the capacitors. (https://www.mig-welding.co.uk/forum/threads/my-own-kempotig-250-ac-dc-problems.33500/)



    Can anyone help me with a wire schematic or a tip what i can check and why this light is burning?

    Thanks ahead!
     
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  2. Screwdriver

    Screwdriver Member

    Messages:
    5,373
    UK London
    I have the same unit and have posted all the information I have on it in this forum. If you do a search you will know everything I know.

    <edit> I had a similar fault which turned out to be a blown internal electrode in the torch connection hose. There's a fuse in there as well which can become corroded.
     
    d.geertsma likes this.
  3. d.geertsma New Member

    Messages:
    3
    Location:
    Netherlands
    Thanks, didnt now that. Will try it tomorrow and let you know.
     
  4. d.geertsma New Member

    Messages:
    3
    Location:
    Netherlands
    Unfortunately there is no fuse in my torch. But thanks anyway.
     
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  5. Screwdriver

    Screwdriver Member

    Messages:
    5,373
    UK London
    On mine there is an electrode (wire) which runs inside the watercooled hose which needed repair. In the hose connection I found a component which I assume is a fusible link (on the grounds that it had blown).
     
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