your pan (s) are ok? Is this right? Is water draining from the pipe on the exterior of the home? If the clear water is too hard to see, add some food coloring to the water so you can see it.
Is there luggage or something that has fallen on the pvc line that could have changed the "fall" of the line to drain? Check it out.
How old is the unit? A set of pans should last for about 15 to 20 years if maintained.
Go to the hardware store and buy a 50 foot electricians fish tool. This is a coiled flexible wire that you can use to run all the way down the pvc tube to rout out and obstruction. It might cost $15.
I think that your problem is to find out why your not draining.
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