Fronius MTG 400i K4 Instructions De Service page 44

Poor wirefeeding
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Gas nozzle gets very hot
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Depending on the system, brakes in the wirefeeder or power source set too
tightly
Set the brakes to be looser
Hole in the contact tip displaced
Replace contact tip
Faulty inner liner or wire-guide insert
Check inner liner or wire-guide insert for kinks, soiling, etc.
Replace faulty inner liner or wire-guide insert
Feed rollers not suitable for wire electrode used
Use suitable feed rollers
Incorrect contact pressure of the feed rollers
Optimize contact pressure
Feed rollers soiled or damaged
Clean or replace feed rollers
Inner liner displaced or kinked
Replace inner liner
Inner liner too short after cutting to length
Replace inner liner and cut new inner liner to correct length
Wear of the wire electrode due to excessive contact pressure from the feed
rollers
Reduce contact pressure from the feed rollers
Wire electrode soiled or rusted
Use high-quality wire electrode without soiling
For steel inner liners: use of uncoated inner liner
Use a coated inner liner
No heat dissipation due to gas nozzle being fitted too loosely
Screw the gas nozzle tightly up to the stop