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Thermal dynamics cutmaster 50 2004 yr.

Will not arc, operates as it always did , air set at 70 lbs, air kicks in upon depressing trigger and normally arc begins in about 5 seconds,but now it doesn"t. ckecked ground with meter, contact all the way.incoming voltage checked on both legs coming in,220 v single phase.took torch apart, ohmed out wiring checked good no breaks in torch lead.220 going to primary coil,pulled trigger checked output voltage to torch 16 volts.when torch should kick in two red leds come on on logic board. ? is there a thermal protection overload on these machines and where? can it be reset.fuses checked good

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  • Anonymous Nov 09, 2008

    I have a Firepower 25 with the same problem, when trigger is applied air comes out but no arc

  • tdodds Feb 02, 2009

    I have a Hobart 400 (same as Miller 375 unit) that has a similar problem. When the trigger is pushed there is a short power surge and the the power lamp starts flashing and no plasma. Have to reset the power switch to try again. Looked inside the unit - no burned components.

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Check contacts in tip and be sure it is all lubed correctly. If you have good air pressure and flow it should arc after pulling the trigger for about 2-3 seconds.

Posted on Nov 10, 2008

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