I take it you mean it's getting condensation on the pipes? any refrigerant would turn to gas..
is there not a condensation tray in the unit? check to see if it's blocked or full ( you don't say if it's portable or not.. the portable ones will have some kind of container that needs manually emptying )..
if it's a split unit ( part inside, part outside ) then make sure that the condensate pipes are not blocked,kinked and that they are pointed downwards towards the outside ( so that they drain out, not back fill in.. )
Dean Worrall, April 2010