intermit pilot arc with CT520

[cardoc]

Set up machine and turned it on. Connected plasma cutter. The first five minutes were good untill it started to sputter. I replaced the consumables, and the same thing happened. Pilot arc is intermittent when switch is depressed. When arc is on, bringing the torch to the material to cut, causes arc to actually blow out. Pilot arc is very intermittent and blows out when close to material. Plasma cutter overall, cannot be used. Please Help. thanks