3. troubleshooting – Miller Electric SuitCase 8VS User Manual
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OM-1599 Page 18
6-3. Troubleshooting
Trouble
Remedy
Wire does not feed; open-circuit voltage
available.
Check circuit breaker CB1. Reset CB1.
Unit overheated. Allow unit to cool.
Check sensing lead connection.
Check gun trigger plug connection.
Check gun trigger. See gun Owner’s Manual.
Wire feeds erratically.
Readjust hub tension.
Readjust drive roll pressure.
Clean or replace dirty or worn drive roll (see Section 4-4).
Remove weld spatter around nozzle opening.
Replace contact tip or liner. See gun Owner’s Manual.
Wire feeds as soon as power is applied. Check gun trigger. See gun Owner’s Manual.
Wire feeds when Jog switch is pressed
but not when gun trigger is pressed.
Check gun trigger connection at wire feeder. Check gun trigger leads and trigger switch. See gun Owner’s
Manual.
Wire stubbing on low end using a con-
stant current power source.
Make sure CC/CV switch is in CC position (see Section 5-1).
Increase output setting of power source.
Gas does not flow or does not stop flow-
ing; wire feeds.
Check gas valve.
Have Factory Authorized Service Agent check control board PC1.
Wire remains energized after trigger is
released.
Check contactor W1 to see if contacts are frozen closed.