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it would appear that there is current or voltage control probably from a dead short in the circuit or a problem voltage control regulator
probably best if you discuss it with the service agents as to what is wrong and get a proper diagnosis
there are a few things you can check on your machine,
make sure your machine is not in the remote control position, make your process switch is in the electrode hot position, the trailblazer has three slip rings, make sure the carbon brushes are not "stuck" in the holders, there are 2 circuit boards in your machine, make sure the plugs are properly inserted into the receptacles and making good contact, also make sure your ignition switch plug is clean and making good contact
What does the voltage window display? If it is reading open circuit voltage then check your leads. You could have a front control board failed if not. You should probably take it to a miller tech to have pre power checks performed.
Some welders have a resistor that is obvious and accessible but to give an error code it is likely something else inside. You'll have to look at the circuit board for a component that is burned. If you are lucky you will find a fuse.
This usually happens when the main Power semiconductors fail. You need to check out the two main places, the Power Supply, make sure ALL voltages are correct, and the main Output semiconductors, check these to make sure they are Not open circuit or short circuit.
Above is your support link.
You need to contact Miller and obtain a service manual, before attempting to service this unit.
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.
If the idle is not working, then it is either you idle solenoid attached to the carberator or your idle board is bad. If you apply 12Vdc to the idle solenoid is should move, if not then the solenoid is shot, no good. If it works then you idle board is bad. Also, check to see if you are 60Hertz by measuring at the outlet with a frequency meter. I recommend a Fluke meter. You should have 120Vac and 60HZ at the outlet. If the frequency is low then your engine speed needs to be increased. The idle solenoid could be causing all these problems.
clean your metal with a good peace of the green scotch guard scrub pad prior to the weld.Also try turning up your gas and move a little faster when using filler wire,rember to much heat causes a darker dirter weld.hope this helps