N.
Troubles
Reasons
Solution
1
Turn ON power but the power
light is not illuminated.
Switch damaged
Change it
Fuse damaged
Change it
Power cord damaged
Change it
2
After welding machine is over-
heat, the fan doesn’t work
Fan damaged
Change it
The cable is loose
Screw the cable tight
3
Press the
gun switch,
no output
shielded gas
No output gas
when test gas
No gas in the gas cylinder Change it
Gas hose leaks gas
Change it
Electromagnetic valve
damaged
Change it
Output gas
when test gas
Control switch damaged
Repair the switch
Control circuit damaged
Check the PCB
4
Wire-feeder
doesn’t work
Wire reel
doesn’t work
Motor damaged
Check and change it
Control circuit damaged
Check the PCB
Wire reel works
The idler roll is loose or
weld wire skids
Adjust tension screws
The drive roll doesn’t fit
with the diameter of weld
wire
Change the roll
Wire reel damaged
Change it
Wire feed pipe is jammed
Repair or change it
Tip is jammed because of
splash
Repair or change it
5
No striking arc and no output
voltage
Output cable is
connected incorrectly or
loosen
Screw it down or change it
Control circuit damaged
Check the circuit
6
Welding stops, and alarm light is
on
Machine has self-
protection
Check over-voltage, over-
current, over-temperature,
lower-voltage and over-
temperature, and solve it
7
Welding current is run away and
can be not controlled
The potentiometer
damaged
Check or change it
The control circuit
damaged
Check the circuit
8
The crater current can be not
adjusted
The PCB damaged
Check it
9
No post-gas
The PCB damaged
Check it
1.995.234 EN - Rev. 1.1
NOVAMIG 320 LCD
29
