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If everything is connected according to manual, then your problem must be contact box inside the machine. If it is a recent model 2005 or higher then it could be the main pc board. I would start by checking the ground cable and clamp first before send it to a repair shop.
these need a good power supply , i looked and did not see the duty cycle on this welder
if you are doing heavy welding 100% power it will need 30- 40 minutes to cool of to weld again. it all depends on the units duty cycle, stated on the welder spec plate ..can you bypass the auto feed speed mode ? this might be the issue.. good luck ..use all the protection you can when welding these are like the sun and can and will burn exposed skin and eyes .. if'n i was any help throw me a bone and vote thanks jay
Take off shroud, look at where the positive lead hooks into the transformer. You may find that the wire has melted, If you are lucky, you can loop it tnough to make a fresh connection. (also check the negitive)
If its a new unit its probably nothing. Miller makes good stuff. Open the side so you can see the spool. With the machine on, press the trigger for a second. Did the little wheel spin (trying to feed the wire) if it did then your problem could be kinked wire, **** on tip, or spring on small spool is loose and wire is slipping. Let me know.
I was warrenty repair shop for lincoln, esab ,miller, hobart,and clark for five years .my expereance with lincoln as far as customer sevice they dropped the ball alot,miller on the other hand had great cusomer service.My opinion the miller family is the way to go for dependability,parts,and service.
If your welder is less than 3 years old your local Miller authorized service center will repair it for FREE. They can also check the serial number of your welder over the phone to see if it is still in warranty. For goodness sake DON'T tell them you've been mucking around inside the welder or they won't be able to help you. That said, if the welder spins the feed wheels without any wire between them it probably isn't the board. There is the switch in the gun, the board, and the motor and brake assembly all needed to feed the wire.