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error Miller
Error Code Help 30
Indicates a short or open in the thermal protection circuitry located in the input inductor of the unit.
? What Causes This
Short or open circuit in the thermal protection circuitry in the input inductor.
✓ 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