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error Miller
Error Code Help 31
Indicates a malfunction in the primary power circuit caused by an overcurrent condition in the primary IGBT switching circuit.
? What Causes This
Overcurrent condition in the primary IGBT switching circuit.
✓ How to Fix It
Contact a Factory Authorized Service Agent.
Source: page 75 of the official manual
From the manual
This error code appears in:
Miller Dynasty 350 Welder