Troubleshooting - Miller Maxstar 152 Manuel D'utilisation

5-4. Troubleshooting

Trouble
No weld output; unit completely
inoperative.
No weld output; Power switch pilot light
on, fan on.
Low weld output with no control.
Limited output and low open-circuit
voltage.
Erratic or improper weld output.
Arc not forming when using Lift-Arc.
Fan not operating.
Wandering arc; poor control of arc
direction.
Tungsten electrode oxidizing and not
remaining bright after conclusion of
weld.
Place line disconnect switch in On position (see Section 3-5).
Check and replace line fuse(s), if necessary, or reset circuit breaker (see Section 3-5).
Check for proper input power connections (see Section 3-5).
Check position of Output (Contactor) switch.
Unit overheated. Allow unit to cool with fan On (see Section 3-2).
Check position of Amperage Control switch (see Section 4-1).
Have Factory Authorized Service Agent check control board PC1.
Check input power for correct voltage. Check and replace line fuse(s), if necessary, or reset circuit
breaker (see Section 3-5).
Check for proper input and output connections (see Sections 3-5 and 3-6).
Clean and tighten all weld connections.
Use proper size and type of weld cable (see Section 3-6).
Check for proper input and output connections (see Sections 3-5 and 3-6).
Replace electrode.
Check electrode and workpiece, clean as needed to allow good contact.
Check for and remove anything blocking fan movement; be sure fan is secure on shaft.
Have Factory Authorized Service Agent check fan motor.
Reduce gas flow rate.
Select proper size tungsten.
Properly prepare tungsten.
Shield weld zone from drafts.
Increase postflow time.
Clean and tighten all gas fittings.
Water in torch. Refer to torch Owner's Manual for part(s) requiring replacement, and repair torch as
necessary.
Remedy
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