What kind of beer are you dispensing? I had the same problem with my Danby but it turned out to be the coupler. I had a Heineken keg with what I thought was an S system (European) coupler; turned out to be a standard D (American) coupler. All I kept getting was air too because the probe was not piercing the keg. If it's same beer with same coupler then I really don't know what it could be (maybe the ball within the coupler?)
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