Lincoln Electric IM366 SP-100 - Manual (Page 25)

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Low or no gas flow Cylinder valve closed Open cylinder valve
Gas flow not set correctly Set proper flow rate
Cylinder out of gas Get new cylinder of gas
Leak in gas line Inspect and replace
Clog or Leak in gun Check for obstruction or defective seals
Arc unstable Wrong welding polarity Check polarity - Refer to proper section
Erratic or Intermittent Wrong size, worn and/or Replace tip - remove any spatter on end of tip
Arc - Poor Starting melted contact tip
"Hunting" Arc
Worn work cable or poor connections Inspect - repair or replace as necessary
Loose electrode connections Be sure electrode lead is tight, gun cable tight in
wire feeder contact block, gun nozzle and gun
tip tight