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If it is leaking on the inside (coil) it usually is a sign the condensate drain is plugged causing overflow, or the coil is freezing up inside and when its off it thaws the ice and melts down the center of the coil and onto the floor,
More than likely, the system is low on refrigerant and the copper line-set is freezing up and water is dripping onto the board in the furnace (and other things) because it is an upflow system with the evaporator coil on top. Other things to check would be: 1. Dirty/clogged filters in the return air system. 2. Fan motor not working inside furnace. (The Blower) 3. Coil dirty/clogged which could be checked by the amount of airflow coming out of the vents. This would have to be cleaned by a technician.
Most of the time, it is the charge which also means there is a leak in the refrigerant system somewhere and needs to be fixed. Hope this helps you out! Good luck.
There is a drip pan bit the middle is open to allow air flow through the coil and into your ducting. If the drain for the drip pan is clogged it will fill up and overflow onto your furnace and then to the floor.If that is what is happening then clean out the drain tube running down the front of the furnace and it should empty the drip pan and solve your problem.
You also need to have your furnace checked for water damage in the electrical components, if these have gotten wet then you run the risk of a fire. Please consider calling an expert in your area to inspect your furnace and make sure the drain line is clear.
Is it a ducted system? If yes, check that there isn't gaps between the divider that separates return air at the front, with forced(cold) air. You can usually use a flashlight and look for gaps, or even (very carefully) feel it blowing cold into the warm air return. If you find some gaps, buy some foil tape, and tape them off good and retry and see if it still happens. Some older units experienced cracks in drip trays that allowed condensation to drip inside as well. Get back to me with year of your RV, and whether it's ducted or non-ducted system, and perhaps I can guide you better on what to look for.
Ensure the air filter and evaporator coils are clean. If they are clean and everything is running properly, then the unit may need refrigerant. It depends on the age of your equipment and the location of the leak (price to repair) as to whether or not the unit is shot. Check your air filter and evaporator coil first. :-)
the drain pan is physically inside the indoor unit.
grab a 1/4" nutdriver and open the bottom service panel your coil and drain pan is there, you won't be able to remove the coil properly but you could see if the system is overflowing causing your flooding problem, let me know what you find