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6 Trouble shooting and fault finding
Notes:
The following operations must be performed by qualified electricians with valid
certifications. Before maintenance, you are suggested to contact local distributor to
verify qualification.
Malfunctions and solutions of MIG 300GD:
Malfunctions
Solution
The meter show nothing;
Fan does not rotate;
No welding output
1. Confirm the power switch is on.
2. Power supply available for input cable.
3. Check if the commute bridge is damaged.
4. There is malfunction occurs in the supplementary power
source on control board (contact dealers).
The meter shows;
Fan works normally;
No welding output
1. Check if all the sockets in the machine are connected well.
2. There is open circuit or badness of connect at the joint of
output terminal.
3. The control cable on the torch is broken off or the switch is
damaged.
4. The control circuit is damaged.(contact to dealers)
the meter shows;
Fan works normally;
Abnormal indicator lights.
1. It might be over-current protection, please turn off the power
switch; restart the machine after the abnormal indicator light
winked.
2. It might be overheating protection, please wait for about 2-3
minutes until the machine renew without turn off the power
switch.
3. It might be multifunction of inverter circuit. (contact dealers)
