8 TROUBLESHOOTING
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69
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© ESAB AB 2021
8
TROUBLESHOOTING
8.1
Power source problems
Table 22: Power source problems
Type of fault
Cause
Corrective action
Electricity supply is ON, the
power indicator is
illuminated, however, the
power source will not start
welding when the torch
trigger switch is pressed.
The power source is not in the
correct mode of operation.
Set the power source to the
correct mode of operation
with the process selection
switch.
Faulty torch trigger.
Repair or replace torch
trigger switch/lead.
Fault indicator is
illuminated and the power
source will not start welding
when the torch trigger
switch is pressed.
Duty cycle of the power source
has been exceeded.
Leave the power source
switched ON and allow it to
cool down. Do not start
welding until the fault
indicator is turned off.
The power source will not
feed wire in MIG mode.
Electrode wire stuck in conduit
liner or contact tip (burnback
jam).
Check for clogged / kinked
MIG gun conduit liner or
worn contact tip. Replace
faulty components.
Internal fault in the power
source
Contact an authorised ESAB
service technician.
Welding wire continues to
feed when the torch trigger
is released.
The trigger mode selection
switch is in 4T latch mode.
Change the trigger mode
selection switch from 4T
latch mode to 2T normal
mode.
The torch trigger leads
shorted.
Repair or replace the torch
trigger switch/lead.
Welding arc cannot be
established in MIG mode.
MIG gun polarity lead is not
connected into a welding
output terminal.
Connect the MIG gun polarity
lead to either the positive
welding output terminal or
the negative welding output
terminal as required.
Poor or no work lead contact.
Clean work clamp area and
ensure good electrical
contact.
Inconsistent wire feed.
Worn or dirty contact tip.
Replace if necessary.
Worn feed roll.
Replace.
Excessive brake tension on
wire reel hub.
Reduce brake tension on
spool hub.
Worn, kinked or dirty conduit
liner.
Clean or replace the conduit
liner.