We had a problem a few years ago with water coming out of the air con units. We found out that if they air con is not used for a while, insects crawl up the outside pipe and lay eggs, so blocking the system. After calling out someone to sort it for us, the guy told us to get a long cleaner, which looks a bit like a bottle cleaner and then just put it up the pipe to clean it out. It always worked, if fact, we have lent this out to our neighbours who then went out to the Yapi Market and bought their own cleaner. So if you have water coming out of the air con, give this a try.