Question about Miller SPECTRUM 375 PLASMA CUTTER 903891 115 230 VOLT

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Cooling Fan When I turn on my 375 miller plasma on it will work ok but the cooling fan will not run. Wherer can I find a schmatic and parts for it.

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  • dumasranch Jan 29, 2009

    It was verry helpful it fixed my problem thankyou

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Go to www.millerwelds.com/products/plasma you will find the info you need there

Posted on Jan 29, 2009

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1 Answer

Esab plasma cutter fault light comes on as soon as it is turned on


The cable or cutting head may be damaged. The power connections may be loose, an internal circuit breaker may have failed. If the cooling fan does not come on, check the wiring in the cabinet for damaged wires. Disconnect fan wires- noting where each connected and check to see if the fan burned out- if it did, replace the fan and it chould begin to work correctly. If the fan checks out okay- it will have 2 discrete sets of windings-one for the fan, the other to provide control voltage.Check that board with the rectifiers as a rectifier may have failed or there may be a fuse on the board.

If it were mine, I would check everything under the cabinet after it has been thoroughly blown clean.

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Miller 375 x-treme fires about 30 seconds then stops it doesn't stay running, no trouble lights...


Have you watched to see if the pressure light comes on right before shutdown? If so you may need to add a tank right next to the torch base to address the pressure drop assuming your air source is able to deliver adequate volume to the cutter continuously and you currently have more than 25 feet of hose between cutter and compressor. It might not hurt to check the internal filter as well.

Dec 29, 2011 | Miller Spectrum 375 X Treme Plasma Cutter...

1 Answer

No pilot ignition, air is ok


Some times when I use my plazma cutter its a cut master 42 .I would some times have to turn it off and turn it back on for it to work .And here lately all it does is air come on and off its like its has a heart beat and then have to cut it off again . I have replaced the tips and electrodes .And nothing .I have took thee electrode out and clean the white dust build up and works fine for a little while

Feb 01, 2011 | Miller SPECTRUM 375 PLASMA CUTTER 903891...

1 Answer

Plasma cutter no cutting


the tech is probably pretty close to the cost of board,but you may have moisture in air that still wont take out the p.c..you have a warrenty on the unit,go to your local welding store and request a new one if refussed tell them you want to talk to the miller salesman which they should have no problem to set up.if not call miller direct in appleton wisc.they are good people.

Apr 07, 2010 | Miller Spectrum 375 X Treme Plasma Cutter...

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

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1 Answer

Pilot wont lite. miller spectrum 701


check the cables in the plasma torch.

If the problem continues, theres no enough power to start it.

Jan 04, 2010 | Miller SPECTRUM 375 PLASMA CUTTER 903891...

1 Answer

Miller Spectrum 375 problem


It sounds like you have a problem in the power supply input area. Make sure your voltage select switch is in the correct location. Unplug the unit and switch back and forth between the two positions to clean the contacts. Try again. If still bad check you terminal lug connections on the input lead wires. If still bad please answer these questions.

Does the power indicator come on at all? Does the fan start?

Nov 12, 2009 | Miller Spectrum 375 Cutmate Plasma Cutter...

1 Answer

I am looking to purchacs a slightly used miller plazma spectrum 375 from a private owner is there any common problems related to this unit that I should look for?


The main thing that can hurt these things is water. If he didn't have a water filter on the line before it enters the plasma it could destroy the unit. If you buy it try it out to see if everything works. When you install it be sure to buy a filter that they sell for these and put it on before the air enters the plasma. Around $400. to $600 to replace the parts when water meets with the components. The filter that Norco Welding supplies sells for these is a toilet paper filter and you need to check it often.

Jul 29, 2009 | Miller SPECTRUM 375 PLASMA CUTTER 903891...

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