[mechanic416]

The plug on the welder was a 115 volt plug, right?

Then all you needed to do is plug it in to a 115 volt outlet and it worked, right?

Then you took the 115 volt plug off and installed a 230 volt plug, right?

Then plug it into a 230 volt outlet and it should work.

If you want to have it to work on both then you should not have taken off the 115 volt plug. Just made a pigtail with a 115 volt outlet on a 230 volt plug

You can't go from 230 to 115 volt unless you are useing a 4 wire cable and plugs

 

[mechanic416]

Sounds like the power/process PCB is bad on the 230 volt side

 

[mechanic416]

If you test it from hot to hot it should be 230v, From ground to #1 hot 115v and ground to #2 hot 115v

Check your braker it may be pluged in wrong