Revision date: 29/07/2015
Page 12 of 24
8. TROUBLESHOOTING
SYMPTOM
POSSIBLE
REASON
SOLUTION
No output, no warning
light, fan not running
Primary power
does not reach the
machine
Mains fuses blown
Machine is not plugged in
Broken primary cable
Cable connection to machine is loose
Machine not switched on
On/off switch damaged
No output, yellow warning
light
Thermal protection
activated
Used at too high duty cycle, wait until
machine has cooled down and power
returns.
Weld with more breaks or lower current
Cooling air flow is hindered, remove
obstructions
Heat development in loose electrode
holder or ground cable connections
Broken fan, repair or replace
Too much dirt in power source
compartment, clean out.
No output, red warning
light in the rear panel
Voltage protection
activated
Too high or too low input voltage, should
be within 190 - 265V
No arc, no warning light
Incomplete circuit
Check ground cable connections and torch
connection
Unstable arc
Polarity
Check that polarity set on the machine
matches the wire
Poor contact
Check ground clamp and torch connections
Contaminated
work piece
Clean
