Hobart IronMan 240 Owner's Manual page 41

Problem Probable Cause
Wire feeds, but no gas flows. Gas cylinder empty.
Gas nozzle plugged.
Gas cylinder valve not open or flowmeter not adjusted.
Restriction in gas line.
Loose or broken wires to gas solenoid.
Gas solenoid valve not operating.
Incorrect primary voltage connected to welding power
source.
Welding arc not stable. Wire slipping in drive rolls.
Wrong size gun liner or contact tip.
Incorrect voltage setting for selected wire feed speed on
welding power source.
Loose connections at the gun weld cable or work cable. Check and tighten all connections.
Gun in poor shape or loose connection inside gun.
Remedy
Replace empty gas cylinder.
Clean or replace gas nozzle.
Open gas valve at cylinder and adjust flow rate.
Check gas hose between flowmeter and wire feeder, and
gas hose in gun and cable assembly.
Have Factory Authorized Service Agent repair wiring.
Have Factory Authorized Service Agent replace gas
solenoid valve.
Check primary voltage and relink welding power source
for correct voltage.
Adjust pressure setting on wire feed rolls. Replace worn
drive rolls if necessary.
Match liner and contact tip to wire size and type.
Readjust welding parameters.
Repair or replace gun as necessary.
OM-284833 Page 37