Why Is My Air Conditioner Leaking Water?

One culprit could be the dirty water drain that leads to the air conditioner. Since an air conditioners primary job is to remove moisture in the home, a dirty drain could cause a leak. Other times, leaking water comes from ice formed by a dirty filter, dirty indoor coil, blocked vents, low refrigerant or a defective indoor fan motor. Any of these can cause ice to build up on the indoor coil, and water to drip on the floor inside the unit.