Troubleshooting - Miller Electric Si 160 Owner's Manual

5-3. Troubleshooting

Trouble
No weld output; unit completely inop-
erative; ready light (LED) Off.
No weld output; high temperature light
(LED) On.
Erratic or improper welding arc or out-
put.
Fan not operating.
Stick welding problems: Hard starts;
poor welding characteristics; unusual
spattering.
TIG welding problems: Wandering arc;
hard starts; poor welding characteris-
tics; spattering problems.
TIG welding problems: Tungsten elec-
trode oxidizing and not remaining bright
after welding.
Notes
Place line disconnect switch in On position (see Section 3-9).
Check and replace line fuse(s), if necessary, or reset circuit breaker (see Section 3-9).
Check for proper input power connections (see Sections 3-8 and 3-9).
Unit overheated causing thermal shutdown. Allow unit to cool with fan On (see Section 3-6).
Reduce duty cycle or amperage.
Check and correct blocked/poor airflow to unit (see Section 3-9).
Use proper size and type of weld cable (see your Distributor).
Clean and tighten weld connections.
Check electrode polarity and reverse if necessary; check and correct poor connections to workpiece.
Unit not warmed up enough to require fan cooling.
Check for and remove anything blocking fan movement.
Have Factory Authorized Service Agent check fan motor and control circuitry.
Use proper type and size of electrode.
Check electrode polarity and reverse if necessary; check and correct poor connections.
Make sure a remote control is not connected.
Use proper type and size of tungsten.
Use properly prepared tungsten.
Check electrode polarity and reverse if necessary.
Shield weld zone from drafts.
Check for correct type shielding gas.
Check and tighten gas fittings.
Check electrode polarity and reverse if necessary.
Remedy
Work like a Pro!
Pros weld and cut
safely. Read the
safety rules at
the beginning
of this manual.
OM-250 147 Page 27