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It is possible that the drain hole on condensate pan is plugged and causing water to over flow pan. Remove cover from unit and check drain line.Clean coils andpan as best you can and clear drain hole. Add a small amount of bleach to water in drain pan.This will kill any algea or bacteria that may be growing in condensate water and plugging the drain. Thank you
If all you want to do is re-route condensation dripping off the roof, and it's a rubber roof, one easy way is to buy a caulking tube of "Dicor" self leveling sealant for rubber roofs from RV dealer, and run a 1/4"-3/8" bead across roof from AC to wherever you want it to go, and let it cure for a couple of hours. Nobody sees it, and a tube is about $10 max.
The drains for that will be between the upper unit and the roof of the RV. You only have an inch or 2 to see under there so it's pretty hard sometimes, but you should see little round button like things sticking down from underside of the roof AC unit. They have holes in them, and can usually be unplugged with a stick, or piece of wire. If you can't get them cleaned out, you will have to make sure you shut breaker(power) off to unit, and remove the cover by taking out the 4 big Philips head screws. That will give you access to clean out holes in base of tray for drainage. If your getting dripping inside when unit not running but raining outside, then gasket will need to be changed.
There is a bolt on each corner that tighten from the inside. You will see them when you remove the inside cover. There should be foam weather stripping around the opening that the unit sits on and then it's tightened up.
there should be a pan under the evaporator coil in the roof mounted unit, the pan should have a hose on it to remove the water to a non objectionable place, you need to locate the drain and pressure it up to clear it, I would also remove the top covaer and check the cleanliness of the coil drain pan itself
These units do not have condensation "hoses", they have an evaporator pan than is located under the evaporator coil and catches the condensation and then lets it drip down onto the roof and then off the RV. If your AC is leaking into the inside, remove the inner shroud and feel up into the evaporator area for the pan. If it is full, then the drain holes are plugged. They are not easy to get to. Remove the upper shroud and then remove the front cover over the evaporator. At the base of this area is the pan, on each end is the drain hole. Clean them out and all should be fine.
It probably has a clogged condensate drain. Take off the cover on top the RV and check hoses or tubes leaving unit for debris or lint. Often this water is used to help cool the condenser so look for leaves pine needles etc in the pan. There may be a cover you can remove on the evaporator section that will allow you to clean the collection pan and hose or trough. Is it possible the RV is far enough out of level that the condensate can't "run uphill"? Always power off while working on this unit unless you are electric savvy. Good luck!