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4.3 TROUBLESHOOTING & SERVICE
Fault
Mains supply voltage is
ON, power indicator is
illuminated however unit
will not commence welding
when the torch trigger
switch is depressed.
Mains supply voltage is
ON. Indicator light is not lit
and welding arc cannot be
established.
Fault Indicator is illuminated
and unit will not commence
welding when the torch
trigger switch is depressed.
Welding output continues
when torch trigger released.
Welding output voltage
is present when the
torch trigger switch is
depressed but arc cannot be
established.
Welding output voltage is
not present when torch
trigger depressed.
TIG electrode melts when
arc is struck.
Arc flutters during TIG
welding.
No HF output in HF mode.
Cause
Power source is not in the
correct mode of operation.
Faulty torch trigger.
Primary control fuse is blown.
Broken connection in primary
circuit.
Duty cycle of power source has
been exceeded.
Trigger mode selection is in 4T
(LATCH) mode.
Torch trigger leads shorted.
Poor or no work lead contact.
Faulty trigger switch / lead.
TIG torch is connected to
the (+) VE terminal.
Tungsten electrode is too
large for the welding current.
HF Circuit faulty.
Remedy
Set the power source to the
correct mode of operation with
the process selection switch.
Repair or replace torch trigger
switch/lead.
Replace primary control fuse.
Have an Accredited Service
Provider check primary
circuit.
Leave the power source
switched ON and allow it to
cool. Note that fault indicator
must be extinguished prior to
commencement of welding.
Change to 2T (NORMAL) mode.
Repair or replace Torch / trigger
lead.
Clean work clamp area and
ensure good electrical contact.
Repair or replace Torch /
trigger lead.
Connect the TIG torch to the
(-) VE terminal.
Select the correct size of
tungsten electrode.
Have an Accredited Service
Provider check HF circuit.
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