One of the most common questions we get on a hot summer here in Spain is “why is my air conditioning unit leaking water?”. You will normally find suddenly water starts dripping from the indoor unit onto the floor. Often at the most inconvenient times such as the hottest times.
The first thing is to recognise that water is supposed to be in the unit. This comes from the air conditioning units evaporator coil this cools the warm air that is blown over the top of it. Doing this generates condensation (moisture) that forms on the coil itself. Easiest way to describe this is how water droplets form on a cold glass on a hot summers day.
Reason 1: Clogged condensate drain line
The drain line is the pipe or hose that comes out of the unit and is the most common reason for water leaks from your AC unit.
If it becomes clogged with dust, dirt or mold you will find the water backs up into your home because it has nowhere else to go. The pipe will need unclogging to allow the waterflow to return.
Reason 2: Damaged drain pan
Before the water goes into the condensate pipe it gathers on a small pan. The problem is on older units these pans often rust and need to be replaced. As quite simply the water is dropping out the bottom of the pan because its leaking.
Reason 3: Broken condensate pump
If you are below the level of the pipework for example in the basement or cellar. There should be a condensate
Reason 4: Dirty air filter
Although you may not
Reason 5: Low refrigerant in system
Low refrigerant can also be an issue relating to a water leak in the air conditioning unit. As it generates low pressure in the system which causes the evaporator coil to freeze over. Which then melts excess water and the drain pan then overflows. You can normally