Troubleshooting - Miller Electric Millermatic 212 Auto-Set Owner's Manual

6-6. Troubleshooting

Welding Trouble
No weld output; wire does not feed.
No weld output; wire feeds.
Low weld output.
Low, high, or erratic wire speed.
Over Temp light on.
Over Temp light blinks rapidly.
Over Temp light blinks slowly.
Wire Drive/Gun Trouble
Wire feeding stops during welding.
OM-238 118 Page 30
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Secure power cord plug in receptacle (see Section 4-14).
Check and replace power switch if necessary.
Replace building line fuse or reset circuit breaker if open (see Section 4-14).
Secure gun plug in receptacle or repair leads, or replace trigger switch (see welding gun Owner's
Manual).
Connect work clamp to get good metal to metal contact.
Replace contact tip (see welding gun Owner's Manual).
Connect unit to proper input voltage or check for low line voltage (see Section 4-14).
Readjust front panel settings (see Section 5-1).
Change to correct size drive roll (see Section 6-3).
Readjust drive roll pressure (see Section 4-15).
Replace inlet guide, contact tip, and/or liner if necessary (see welding gun Owner's Manual).
Unit has overheated and output stops. Let unit cool before continuing welding operation.
Gun trigger is closed or shorted when unit power is turned on.
Indicates a malfunction in the wire drive system or drive motor overcurrent. Check for proper spool brake
adjustment or obstructions in the wire feed system. Check wire guides, gun liner and contact tip.
Straighten gun cable and/or replace damaged parts (see welding gun Owner's Manual).
Adjust drive roll pressure (see Section 4-15).
Readjust hub tension (see Section 4-11).
Replace contact tip if blocked (see welding gun Owner's Manual).
Clean or replace wire inlet guide or liner if dirty or plugged (see welding gun Owner's Manual).
Replace drive roll if worn or slipping (see Section 6-3).
Secure gun plug in receptacle or repair leads, or replace trigger switch (see welding gun Owner's
Manual).
Check and clear any restrictions at drive assembly and liner (see welding gun Owner's Manual).
Have nearest Factory Authorized Service Agent check drive motor.
Remedy
Remedy