Fronius TPS/i Robotics PushPull CMT Operating Instructions Manual page 120

No welding current
Mains switch is ON and indicators are lit up
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No protective gas shield
All other functions are OK
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Irregular wire feed speed
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120
Grounding (earthing) connection is incorrect
Check the grounding (earthing) connection for correct polarity
There is a break in the power cable in the welding torch
Replace the welding torch
Gas cylinder is empty
Change the gas cylinder
The gas pressure regulator is faulty
Replace the gas pressure regulator
Gas hose is not fitted or is damaged
Fit or change the gas hose
Welding torch is faulty
Change the welding torch
Gas solenoid valve is faulty
Contact After-Sales Service
Hole in the contact tip is too narrow
Use a suitable contact tip
Faulty inner liner in welding torch
Check the inner liner for kinks, dirt, etc.
The feed rollers are not suitable for the wire electrode being used
Use suitable feed rollers
Feed rollers have the wrong contact pressure
Optimise the contact pressure