11/20
TROUBLESHOOTING
Anomalies
Causes
Remedies
The device does not deliver any
current and the yellow indicator
lamp of thermal overheat
lights up.
The welder thermal protection
has turned on.
Wait for the end of the cooling
time, around 1-5 minutes. The
indicator lamp
turns off.
The display is on but the device
does not deliver any current.
The cable of the earth clamp
or electrode holder is not
connected to the welder.
Check the connections.
If, when the unit is on and you
put your hand on the welding
unit’s body, you feel tingling
sensation.
The welding unit is not
correctly connected to the
earth.
Check the plug and the earth of
your electrical network.
Your unit does not weld
correctly.
Polarity error.
Check the polarity advised on
the electrode packaging.
M
M
A
-
T
IG
When starting up, the display
indicates
The voltage is not included in
the range 110V +/- 15%
Have the electrical installation
checked.
Use a tungsten electrode of the
correct size
Fault
coming
from
the
tungsten electrode
Use a well prepared tungsten
electrode
Unstable arc
Excessive gas flow rate
Reduce gas flow rate
Welding zone
Protect welding zone against air
flows
Increase post-gas duration
The tungsten electrode gets
oxidised at the end of the weld.
Fault coming from post-gas or
the gas has been stopped
prematurely.
Check and tighten all gas
connections. Wait until the
electrode cools down before
stopping the gas.
M
M
A
-
T
IG
The electrode melts
Polarity error
Check that the earth clamp is
connected to +
