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17
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2. Common Machine Problems and Troubleshooting
No.
Problem
Root cause
What to do
1
Machine is switched
on, no indicator
light, fan not
operational, no
welding output.
Power phase down.
Check power supply phases and
rectify.
Power switch
malfunction or
damaged.
Repair or replace switch.
Control board
damaged.
Replace the control board.
2
Machine turned on,
power switch on the
rear panel shuts off
immediately.
Power switch broken.
Replace power switch.
IGBT damaged.
Replace IGBT and drive circuit
board.
Bridge rectifier
damaged.
Replace the bridge rectifier.
Control board
damaged.
Replace control board.
3
Warning light on
during welding
operation, but no
welding output.
Extended
overload
operation.
Wait 2
-
3 minutes. Welding
machine to be used within the duty
cycle.
Power switch
damaged.
Replace power switch.
Faulty inverter circuit.
Replace inverter circuit board.
4
Welding circuit not
adjustable.
Failed current
potentiometer.
Replace potentiometer.
Machine control board
damaged.
Replace control board.
