It welds fine on the other settings but won't feed wire on the highest amp setting D
I would say there is no electrical contact on that setting. Check this first. Good Luck Friend.
SOURCE: I have a Lincoln wire feed SP-200 welder and my
Try replacing the circuit breaker. They can/do get weak and tend to trip before they actually reach the rated limit.
SOURCE: My lincoln welder lost its heat penetration
It only produces 100amps. You can only weld thinner metal 3/16" comfortably. Any thicker will resuld in less/no penetration.
SOURCE: Lincoln Weld Pak 100 arc welder troubleshooting
There can be a switch that makes the wire electrically "dead" so it can be fed through the liner. Also suitcase style welders have a sensor wire with a clamp that must be connected for the arc to be able to be struck.
SOURCE: my lincoln wire feed welder while welding,the weld
try changing the tip and make sure your ground connection is good on the steel and in the machine sometimes the ground wire in the machine comes loose
Testimonial: "thanks so much."
SOURCE: The wire feed on my welder will not work.
Maybe you can get lucky like I did . Some times the acr volt selector switch gets corrosion in it and wont let the circuit board know to send power to the wire feed motor. You can cycle this arc volt. switch in my case it is the a,b,c,d,e, switch back and fourth a few times and this will brake the corrosion and your wire might feed again as mine did . This corrosion build up happens from not using and or sollecting the switch much usually on a welder at hm that gets very little use. it is common good luck .
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