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Use the following code to detect for a blow up:

psspy.fdns()
if psspy.solved() == 2: print "Blownup case"

Regarding fixing a blowup, that is a complex question. Blowups can occur due to a lot of different factors. You can check out this post for more information. I personally would start by looking at largest mismatches, given at the bottom of the case summary:

psspy.list(0,1,1,0)