Where are the diagnostic fault codes for the PipeWorx 400 documented?
Diagnostic codes for both the power source and wire feeder are documented in Section 7-10 of the manual. Additional troubleshooting information for the power source, wire feeder, and cooler is found in Sections 7-11 through 7-14. Refer to page 78 for the fault code tables. (Page 78)
From the official Miller PipeWorx 400 Welding Machine manual, page 78
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