Where can I find the diagnostic fault codes for the PipeWorx 400 and wire feeder?
Diagnostic codes for the welding power source and wire feeder are covered in Section 7-10 of the manual. Additional troubleshooting information for the power source and wire feeder is found in Sections 7-11, 7-12, and 7-13. (Page 78)
From the official Miller PipeWorx 400 Welding Machine manual, page 78
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