Troubleshooting - Miller Unitor UWI 150 Auto-Line Mode D'emploi

6-2. Troubleshooting

Trouble
No weld output; unit completely inop-
erative; ready light Off.
No weld output; ready light On.
No weld output; high temperature light
On.
No weld output; high temperature light
Flashing.
No weld output. Blue light flashes contin-
uously, yellow LED off.
No weld output. Blue LED flashes 3
times repeatedly, yellow LED off.
No weld output. Blue LED flashes 4
times repeatedly, yellow LED off.
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.
Place line disconnect switch in On position.
Check and replace line fuse(s), if necessary, or reset circuit breaker.
Be sure power cord is plugged in and that receptacle is receiving input power.
Check and secure loose weld cable(s) into receptacle(s).
Check and correct poor connection of work clamp to workpiece.
Unit overheated causing thermal shutdown. Allow unit to cool with fan On (see Section 4-4).
Reduce duty cycle or amperage.
Check and correct blocked/poor airflow to unit (see Section 4-6).
Turn Power Off and back On again. If light continues to flash, check with Factory Authorized Service
Agent.
Line voltage to high or to low. Line voltage must be within
Unit needs to be reset. Cycle power off and back on. If problem is not corrected, contact Factory Autho-
rized Service Agent.
Remote trigger left on. Turn off remote trigger, wait five seconds, and restart operation.
Unit needs to be reset. Cycle power off and back on. If problem is not corrected, contact Factory Autho-
rized Service Agent.
Use proper size and type of weld cable (see your Distributor).
Clean and tighten weld connections.
Check and reverse polarity; 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 and reverse electrode polarity; 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 and reverse electrode polarity.
Shield weld zone from drafts.
Check for correct type shielding gas.
Check and tighten gas fittings.
Check and change electrode polarity.
Remedy
±
10%.
OM-220 340 Page 19