I have a Syncrowave 250dx liquid cool runner edition serial # LE407225 . The issue with it is that it wont work in AC mode to do aluminum welding will work in DC mode no problem.
What it does it sputter and does not respond to the pedal input.
What i have done is clean the contact and adjust the gap multiple time. Issue still the same. Ive blown compress air through the machine to clean any dust and dirt in the machine Same no fix. Tried different tungsten, pedal and torch..same issue..It is still on the same tank of Argon before issue began. oh i also replaced the pedal micro switch with no helping effect..
any help would be appreciated.

Thanks in advance