Miller Electric Millermatic 212 Auto-Set, Owner'S Manual

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OM-238 118 Page 43
Problem Remedy Probable Cause
Welding arc not stable. Wire slipping in drive rolls. Adjust pressure setting on wire feed rolls. Replace worn
drive rolls if necessary.
Wrong size gun liner or contact tip. Match liner and contact tip to wire size and type.
Incorrect voltage setting for selected wire feed speed on
welding power source.
Readjust welding parameters.
Loose connections at the gun weld cable or work cable. Check and tighten all connections.
Gun in poor shape or loose connection inside gun. Repair or replace gun as necessary.