Lincoln Electric IDEALARC IM402-B - Manual (Page 15)

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TROUBLE
C. Variable or sluggish welding.
D. Welder wonʼt shut off.
E. Polarity switch wonʼt turn.
CAUSE
1. Poor work or electrode terminal
connection.
2. Current too low.
3. Low line voltage.
4. Welding leads too small.
5. Old and badly frayed welding
cables.
1. Line switch has failed
mechanically.
1. Contacts rough and pitted from
improper switching under load.
WHAT TO DO
1. Check and clean all connections.
2. Check recommended currents
for rod type and size.
3. Check with power company.
4. See Output Cable section.
5. Replace.
1. Replace switch.
1. Replace switch.
TROUBLESHOOTING (CONTINUED)