Question about Miller Hobart AirForce 250A Plasma Cutter w/Builtin Air Compressor

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I bought a Airforce 250 used , with the correct air pressure , the unit pluged in and the ground clamped on when the trigger is pressed the plasma tourch comes on then pops out then back on .I changed the electrode 196925, tip 196926, swirl ring 196927, dgag shield 196929 and I still get the pop on and off .

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SOURCE: hobart airforce 250 ci has power but will not operate

make sure that there is air to the plasma and set at the proper psi. Make sure that the contact tip and nozzle is in the cutting head correct.

Posted on Dec 18, 2009

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SOURCE: I can cut for about 4 min. then Cup Error

look at your duty cycle 40 % duty cycle is 4 min 10 min sraight is minimum 100%, but good machines weld for 3 or 4 shifts till they get turned off


my 2 cents

Posted on Mar 13, 2010

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1 Answer

Hobart 400 plasma cutter. when i hit the trigger nothing but one short blast of air.


Make sure you have a good ground. If ground is good, make sure you are holding the tip level to the work and right up close.

Aug 31, 2011 | Hobart Plasma Cutter - Airforce 400

1 Answer

Hi I have a hobart airforce 250ci 2 and a half year old lightly used plasma and the power doesn't come on


Check your ground and make sure the ground is clean, if not sand it slightly where it's shinny then try tighten the ground clamp and tighten the ground clamp on the machine itself. Be sure the breaker is not tripped for the machine in the main electrical panel as well check that the electrical cord has not worn down from use, you may have to replace the electrical connector if it is badly worn. you can buy at any hardware store, you will want to buy a 15 amp male connector. If this does not sole your problem please let me now for more help. also be sure air is working for the machine.

Aug 07, 2010 | Hobart Airforce 250ci Plasma Cutter 12...

1 Answer

Only cuts for 3 seconds, device still on


Possibly an internal short in the torch tip... the expendable components failing in the tip will cause the sensors in the machine to register a "no cut" or "free air arc" state and kill the power to the tip to prevent damage to the unit. Replace the tip components and double check the grounds connections.

Apr 03, 2010 | Hobart Airforce 250ci Light Weight Plasma...

1 Answer

My Hobart 250 airforce doesn't start


On the main circuit board for the power supply, there is usually a thermal fuse installed, its a sealed unit and is not servicible, look for a black epoxied case,approx 3/8x3/4 long, with 2 leads coming out of it. Inside is a set of bi-metal contact points which serves as an over voltage/over current protection. These contacts deform/corode over time and it sounds like there not contacting properly. As soon as you try to load the machine, the current passing through this high resistance heats these contacts up, and shuts off power to the unit. I am not familiar with the guts of a hypertherm, but have extensive experiance repairing inverter based plasma cutting equipment, and i have encountered this before. I assume hypertherm must have some equivelent to this thermal switch inside the power supply.....Good luck..

Dec 29, 2009 | Miller Hobart AirForce 250A Plasma Cutter ...

1 Answer

Hobart airforce 250 ci has power but will not operate


make sure that there is air to the plasma and set at the proper psi. Make sure that the contact tip and nozzle is in the cutting head correct.

Dec 18, 2009 | Hobart Airforce 250ci Plasma Cutter 12...

1 Answer

Plasma cutter only cuts for only a few seconds


The unit needs to be tested.

You're welcome to ship the unit to me for diagnostic testing and repair. info@taeckertindustries.com

Nov 07, 2009 | Airforce Welding Tools

2 Answers

No power to the cutting torch when the trigger is pressed


check to make sure all torch parts are in good shape and is put in correctly

Mar 11, 2009 | Welding Tools

1 Answer

Hobart 250 a keeps cutting off the flame


If you have a bad air supply then the moisture in the air will cause the torch to cut off and the cut quality depends also on air supply,speed,metal thickness and condition of your consumables,meaning your electrode and other related parts in the torch tip.Hope this helps

Jan 05, 2009 | Miller Hobart AirForce 250A Plasma Cutter ...

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