If your indoor unit is leaking water down the wall,it is from one of two things.First, is possibly the insulkation on the copper lines is coming loose and the suction line is condesated,with no way to drain,it drips down the unit.The other possiblity is that the drain hose is coming loose from vibration and leaking a little.
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Normally, an Air Conditioner removes water from the air and that water condenses on the coils of the inside section that does the cooling. The water condenses on the cooling coils just like moisture condenses on the outside of a glass of ice water. This excess water drains out of the cooling section through a "drip tube" and is supposed to drain outside of the house, or a drainage system. Your "drip tube" has either not been installed (if it is a brand new installation), has separated and water is now dripping into the house instead of outside of it. Or it is clogged. This happens when algae builds up inside the "drip pan". If that is the case, you can purchase "algaecide" tablets which kill the algae that is clogging the drip pan and preventing water from draining out through the drip tube. These tablets can be found in many hardware stores, refrigeration supply companies, or even Walmart. You can put a tablet inside the pan. (You will have to remove the cover of the unit). You can often use a little bit of Bleach and that will act as an algaecide. Hope this helps, Best, Mark
When the unit is on, go on the back side of the wall where the unit is
mounted. If this is a split system find the condensate hose and make sure it is not plugged and is draining.
If this is a window unit again go in the backside of the wall and see if it
is dripping there. If it is not, take the unit out of the wall, remove the top
and wash underneath the coils. Install the unit so it slants to the back.
This can be due to three reasons. The water drain pipe is block. Which can be sucked clean with wet/dry vacuum cleaner. The drain pipe behind the unit is not sloping downward away from the unit. Or the coils of the internal could be iced up. If this is the case the unit should be switched of until the ice is completely melted and switch the unit on again. If the copper pipes leaving the the condenser unit outside is starting to freeze up, the unit is short of gas. Call a A/C company to refill the gas and search for possible gas leaks.
Where is water dripping? Out the outside unit or inside? Evap. Coils (indoor coils) condense when cooling so it is necessary to have a condensate drain hooked up. If the unit is leaking out of something besides the drain like out of the coil case then you have a blockage in your condesate line either in the drain pan under the coil or somewhere in the line that leads to your drain. blow the line both ways with nitrogen or pull the line out and clean it with a hose.
Where is it dripping from inside the trailer? is a tray under the unit filling up? why does the line drip? where from? is it split? have you put a color dye in condensate to check flow what temp have you got inside your trailer when A/C off?