Miller Electric 452 Owner's Manual download pdf (Page 34)

OM-203 860 Page 30

4-12. Troubleshooting

Trouble Remedy

No weld output; unit completely

inoperative.

Place line disconnect switch in On position (see Section 2-11).

Check and replace line fuse(s), if necessary, or reset circuit breaker (see Section 2-11)).

Check for proper input power connections (see Section 2-11).

Check fuse F1, and replace if necessary (see Section 4-3).

Check for proper jumper link position (see Section 2-11).

No weld output; Power switch pilot light

on; fan on; meter display On.

Check, repair, or replace remote control.

Unit overheated. Allow unit to cool with fan On (see Section 2-2).

Check voltmeter/ammeter Help displays.

Unit overheated. Allow unit to cool with fan On (see Section 2-2).

Have Factory Authorized Service Agent check control board PC1.

Unit provides only maximum or mini-

mum weld output.

Have Factory Authorized Service Agent check control board PC1.

Erratic or improper weld output. Use proper size and type of weld cable (see Section 2-9).

Clean and tighten all weld connections.

Have Factory Authorized Service Agent check control board PC1 and/or SCR in main rectifier.

Fan not operating. Note: fan runs only

when cooling is necessary.

Check for and remove anything blocking fan movement.

Have Factory Authorized Service Agent check fan motor.

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Miller Electric 452 Owner's Manual Page 34