Troubleshooting - Hyundai MMA series User Manual

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9. Troubleshooting

Common Malfunction Analysis and Solution:
Turn on the machine, the power LED is off,
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 when welding.
Turn on the machine, the power LED is on,
the fan works, but no welding output.
The electrode holder becomes very hot.
Excessive spatter in MMA welding.
Hyundai
Malfunction
MMA-100/120/140/160/180/200
Cause and Solution
(1) Check if the power switch is closed.
(2) No input power.
(1) The current potentiometer fails. Replace it.
(2) Check if any loose contact exists inside the machine. If any, reconnect.
(1) Check if any loose contact exists inside the machine.
(2) Open circuit or loose contact occurs at the joint of output terminal.
(3) The overheating LED is on.
a) The machine is under over-heating protection status. It can recover
automatically after the welding machine is cooled.
b) Check if the thermal switch is ok. Replace it if damaged.
The rated current of the electrode holder is smaller than its actual working
current. Replace it with a bigger rated current.
The output polarity connection is incorrect. Exchange the polarity.