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Typically a blocked evaporator drain. Remove filter and inspect the drain pan which is below the radiator looking bit. Clear any obvious blockage around the outlet. Alternatively, find the drain outlet and blow back up it gently. This can be done with compressed air or similar. Take a photo of the indoor / incar unit and post it here if you are still stuck.
Normally, the condensate will drain out of the unit onto the roof and off the edge to the ground. Remove your cover inside (probably 2 screws) and tighten the 4 bolts you will find inside. If they are tight, go to your RV supply place and get new roof gasket. Remove the AC and insert the new gasket and resecure the AC to your roof.
If it's leaking inside where filter cover is, then real good chance the drains being plugged is the only problem. If water (condensation) not running off roof when operating in cool mode, then I'd bet drains, which are located under unit on roof, and you should see them sticking down like buttons. They have a hole in side that needs cleaning with a pipe cleaner or similar to open them up. If need be, shut off power to unit and remove top cover on roof unit and look for the drain holes in base, and clean them out. If water comes in while raining, but AC not running, then it's gasket. That is remedied by removing ceiling assembly (just screws) and 4 bolts that pull/hold the upper and lower assemblies together, unplug wiring to upper unit, and simply lift it off, change gasket and re-install. Tighten those 4 bolts equally when gasket is aligned properly over hole, only until gasket is approx 1/2, original thickness. Plug harness back in and your done. (about an hours work.) Only other thing that may be wrong is styrofoam drip tray for cooling unit, under cover on roof may have a crack , allowing condensation to leak in. If that 's the case, you can try to find a sealant compatible with styrofoam to seal those cracks.
Hi,
When that happens it is because the drain hole up on the unit gets plugged with dust and dirt...you will need to take a wire up top and run it back through the hole to clean the dirt out of the hole so the water can get out.
You need to find where the drain is. The water should flow to a drain and not into the unit. Once you get the condensation draining properly you can use a good quality silicone to seat around the unit. You might check at a RV parts place and find a product they recommend for RV roofs. Hope this helps.
Take air filter off , look up inside & see if coils freezing/frosting up when starts to blow warm air. Is this a new unit, and has it always done that or just recently?
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!
I am not en expert at RV A/C units. I have worked on a couple before. There should be a reservoir somewhere under the evaporator coil(looks kind of like a radiator in a car but much smaller). It should have a hose or something to drain it away from the a/c unit. These very often become plugged on any kind of A/C unit. However if you choose to do this on your own, you will have to climb on top of the RV and remove the cover from the a/c unit to do this. It might be safer to take it to an RV repair shop.
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