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A red fault light is illuminated all the time it wont work

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The 3 reasons which will cause the infamous red light of death to come on and the machine not function, is because of over/under voltage protection,( make sure you have adequate voltage to the machine) thermal protection (because the duty cycle was exceeded), or mosfet failure. Assuming you have the correct voltage, and the machine is cold, try opening the case. Attached to the aluminum heat sink housing the mosfet transistors is a small button sized metal pill with 2 wired attached to it. This is a bi-metallic thermal fuse, when it gets hot, the contact points inside will open up, and cause the machine to shut down. Check for continuity, because sometimes these contact points inside dont re-align correctly, and your machine thinks its always too hot. If you plug in the machine, and it seems to work, but when you key your plasma torch, everything shuts down and the red light comes on......then theres a good chance the mosfets are gone. When they go, there paired off in series of 3, Chances are youll need to change all 3. Hope this helps........

Posted on Jan 18, 2010

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  • Larry
    Larry Oct 21, 2010

    Too generalized stating mosfets, could be any number of other componets failed.

  • wadef Oct 23, 2010

    RE: (Too generalized stating mosfets, could be any number of other componets failed.)
    I agree Giant Tech, but for sake of brevity, and because i didnt feel like typing all night, blown mosfets are the most likely cause. I too have dealt with your old manufacturer, and have had MOSFET nightmares. Most were caused by poor assembly techniques,( either ESD Damaged chips, or over tightening of the retention bars that hold them in place), and caused them to crack.... Ive had about 10 machines,( From various manufacturers), in the past that when new mosfets were put in, they worked fine, for years. Any thing beyond blown mosfets, wouldnt be worth mentioning as repair now becomes beyond the scope of what the owner could repair himself..
    regards...

    . Wade

  • mwise70 Nov 15, 2010

    would the min air supply code show up

  • Polymetalfab Feb 25, 2011

    Wade you seem to know a great deal, maybe you have an answer for me. I have a 1251 the pc board that distributes power in the machine had a burned diode, it still cut fine. Now I have no pilot arc, the board looked burned worse than it did. I purchased the board and replaced it, still no pilot arc. No error lights and the air solenoid opens when I press the trigger. I also tried my barrel torch with its remote on/off switch. Still no pilot arc.

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Hi, this could be the air pressure is not high enough or set too low try setting the correct bar pressure on the gauge to the recomended value which is on the spec plate or somewhere on the machine. Usually this is between 4 & 7 bar

Posted on Oct 07, 2009

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