When your AC air filter is dirty, partially blocked, or completely clogged, your air conditioner’s
evaporator coils are more likely to freeze up, causing excess water to overspill from the drain
pan.
This depend on the age of your AC unit, your AC's drain pan may rust and crack or split over time, As the drain pain is situated beneath the evaporator coil, it collects any condensate
from the indoor unit. If it is cracked or misplaced, drainage of water cannot be carried out
properly. As such, causing water to leak from your air conditioner.
The water in your air conditioner travels to the drain pan via a complex system of drain pipes.
If the drain pipe is blocked, it could cause water to leak from your AC.
If your air conditioner is relatively new and yet starts to leaks water it is most likely be due to
an installation issue. Improper sizing or an incorrectly installed drainage pan can lead to water
leaking from your air conditioner.
If your refrigerant levels are low, the pressure in your AC system will lower as well, which can
cause the evaporator coils to ice up. If those coils freeze, your drain pan may overflow which
cause the leak water.