Fronius MTG 400i K4 Instructions De Service page 44

Troubleshooting
Troubleshooting
No welding current
Power source switched on, power source indication illuminates, shielding gas
present
Cause:
Remedy:
Cause:
Remedy:
No function after pressing torch trigger
Power source switched on, power source indication illuminates
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
No shielding gas
All other functions present
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
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Incorrect ground connection
Establish proper ground connection
Power cable in welding torch damaged or broken.
Replace welding torch
FSC ('Fronius System Connector'—central connector) not inserted
up to the stop
Insert FSC up to the stop
Welding torch or welding torch control line faulty
Replace welding torch
Interconnecting hosepack not properly connected or faulty
Connect interconnecting hosepack properly
Replace faulty interconnecting hosepack
Faulty power source
Notify service provider
Gas cylinder empty
Change gas cylinder
Gas pressure regulator faulty
Replace gas pressure regulator
Gas hose kinked, damaged, or not attached
Attach and straighten gas hose. Replace faulty gas hose
Welding torch faulty
Replace welding torch
Gas solenoid valve faulty
Contact service team (have gas solenoid valve replaced)