Central air conditioners can leak for different reasons. Clogged drains are one of the common causes for an air conditioner to leak. The drain pipes can become clogged with sludge, dust or mold. You can attempt to clean the drains or call in a professional AC technician. Hiring an AC technician is expensive but a quick way to stop the leak. Unclogging the drains is necessary for stopping the leaking and to prevent the air conditioner from completely shutting down. Leaving the drains clogged can also lead to irreversible damage and having to replace expensive parts.
Determine the reason for the air conditioner getting clogged. If you have an air conditioner for a long time and don't receive yearly cleanings from an air conditioner technician, then eventually the system will become clogged. Mold, dust particles and other debris will collect at the bottom of the pipe over time; this leads to the particles building up and causing a blockage. Condensation will flow through the pipe, but this is not enough to clear the drain. Over time, blockage will prevent the water from draining, which leads to leaking.
Switch off the air conditioner from the main line.
Open the air conditioner panel and look for the drain pan. The drain pan will contain water if clogged drains are really the problem. Remove the pan from the AC panel and clean it with warm water. Completely dry the drain before putting it back into the AC panel.
Locate the drain pipe; this is important because the location is possibly the reason for the leaking. The proper position for the pipe is to stick out of the ground and not be embedded in the ground. If the pipe is embedded in the ground, dig out the pipe to prevent blockage. A properly functioning drain pipe will allow the water to run freely out of the pipe.
Use a vacuum cleaner to remove any blockage from the pipe. A vacuum cleaner will remove particles or anything that may clog the pipe. Other options for cleaning out the pipe are using the pressure of water to push out particles.
Re-connect the panel and connect the air conditioner back to the main line. After re-connecting the central AC, run the air conditioner for awhile to check for leakage.