If your RV air conditioner is leaking, then it is probably time to replace the rooftop gasket that seals the unit. As this gasket ages, it becomes brittle, hard, and unable to seal the opening, thus permitting moisture to enter the RV. Replace an old gasket with a new one and eliminate a frustrating air conditioner leak.
No, it is likely the sealing material is weathered and cracked, it is not a gasket.
SOURCE: rv ac unit leaks, even when fan only
Where the pipes enter the building, look carefully there for a bad seal. Use a good quality sealant and block the leak properly. If there is no rain, and the unit is leaking still with the fan on only, then you have an issue with the drain pipe angle or a kinked pipe or a blockage. Suggest you have it seen to by a aircon. technician as that repair is really not easy.(AC will possibly have to come out to rectify problem).
SOURCE: Duo-therm brisk air AC unit leaks water into my RV when it rains
take the cover off and make sure the drain line is clear on top off RV.
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