Question about Miller 903777012 SPECTRUM 2050 PLASMA CUTTER

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Miller 2050 that will not spark.

I Have a Miller 2050, it has good air flow...But when you hit the trigger, the air stops and eventhough the ready light is on it will not arc. I have swapped the hose, and gun three times, checked the ground.

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  • freebass24 Mar 15, 2009

    Cut through 1/2" mild beautifully the first time. 8-1" holes, 1-18" hole the a 35" pentagon. Minor angle burn and did not spark for one of the 1" holes, but other than that did good. During the second part about halfway thru, the spark would go out and come back on in mid cut. Then an angle burn in excess of 5 deg. Before it finished the part the tip was fried and stopped burning thru. I am on the 5th yes 5th replacement torch and cant get thru a part without changing all tip components. This is when the tip fires. The problem is the same from 5mm Stainless thru 3/8" stainless and now on to 1/2" mild. Ive had reps galore come out and no results past the initial cut. Just long enough for the rep to get out the door. I recommend avoiding the miller!

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  • 24 Answers

This is relative to 3 causes , contol board , pwm board or torch

Posted on Sep 18, 2009

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I have a miller 255 nig .the welder will start to weld and stops gas flow is working the triger is working . You can relase the triger and start it again it willweld about 1 inch and stop emall ...


Sound like you have a machine programed on stitch mode, to override the program do the following:

1)Turn off the machine
2) With the machine turned off press the gun trigger.
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It runs when u press the trigger theres no fire or air comes out


Is the compressed air pressure in the limits for the unit to work. try turning the pressure up.

Aug 01, 2010 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

Spectrum 2050 plasma cutter . Cutter blows air and stops when trigger is pulled no pilot arc or any cutting when trig is released air flows again and stop after 10 sec new tips was working the day...


Check compressed air pressure is in limits otherwise unit will cut out. Try adjusting the pressure up. also make sure the supply pressure is correct as it may not be your plasma cutter at fault.

Jul 30, 2010 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

Spectrum 2050 plasma cutter will not arc


Possible failure of the trigger switch and or the cable back to the unit. Use an ophmmeter to check that the trigger and cable are good,

Then with the ohmmeter check the continuityu of the cable to the electrodes,

Connectors are always suspect.

These are starting ponts to check.

Mar 04, 2010 | Miller 903777012 SPECTRUM 2050 PLASMA...

1 Answer

It runs but when you press tha trigger theres no


go to miller.com they have downloads for most everything they make. it sounds like you might have a ground problem or a bad connection in the tip

Jan 24, 2010 | Miller 903777012 SPECTRUM 2050 PLASMA...

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Your problem is in one of two areas. The controller board inside the unit or a bad trigger on your gun.

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a hole in your gas line or the solenoid is sticking

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No arc. Power and Air OK


if the main power cable is cut that is your problem,unit uses high frequency.the two leads go to the gun trigger back to unit,no fuse or fuseable links in the gun.

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1 Answer

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check groun dconnection on workpiece and where connected to machine>> check reset switch.>
There is a screw in fuse on the back make shure you unplug the machine befor removing any fuse or working on any electrical problem.>>OUCH!

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