30
TROUBLESHOOTING
Problem
Possible Cause
Remedy
Turn on the machine,
the fan doesn't work,
and no welding output.
Turn on the machine,
the fan works, but the
output current is
unstable and can't be
controlled by
potentiometer
(
Regulator knob)
when
welding.
Turn on the machine,
the power is on, the fan
works, but no welding
output.
The electrode holder
becomes very hot.
Check if the power switch is ON.
The current potentiometer fails.
Loose contact.
Loose contact.
The overheating “E-3” message is
displayed on the digital display.
The rated current of the electrode
holder is smaller than its actual
working current.
No input power.
Replace it.
Check if any loose contact exists
inside the machine. If any, reconnect.
Check if any loose contact exists
inside the machine. If any, reconnect.
Open circuit or loose contact occurs
at the joint of output terminal.
The machine is under over-heating
protection status. It can recover
automatically after the welding
machine is cooled.
Check if the thermal switch is ok.
Replace it if damaged.
Check if the thermal switch is loosely
connected, and reconnect it if
necessary.
Replace it with a bigger rated current.