Why Is There a Puddle of Water Under My Air Conditioner?

Air conditioning units remain a great mystery to many homeowners, but the concept of how they function is quite simple. The purpose of an AC unit is to cool and dehumidify your indoor air. The warm indoor air passes over evaporator coils where the refrigerant inside the coils cools it. The cooling of the warm air causes moisture to collect on the evaporator coils. Over time, the collected water drips into a condensate pan from where it is pushed into a PVC condensate drain line.

When your air conditioning unit is functioning correctly, you will not see any water because it drains through the PVC condensate drain line connected to the exterior drainage system. When water starts pooling under your air conditioner, it is a sign of a problem with your AC unit. Therefore, you need to contact a certified AC technician to diagnose and fix the problem. Luckily for you, we offer 24 hour HVAC repair in Warrington PA and other locations throughout the Greater Philadelphia Area.

Now that you know how your air conditioning unit works, let’s look at some of the problems that can cause water to pool around your AC unit.

  1. A Faulty Float Switch

Some air conditioning units have a float switch whose function is to regulate the amount of water in the condensate pan. When the water level in the condensate tray gets too high, the float switch signals the air conditioning unit to switch off to prevent water from spilling over. When there is a problem with the float switch, the AC unit doesn’t turn off, which causes water to overflow.

  1. Blocked Condensate Drain

The function of the PVC condensate drain line is to direct water to the mainline. Bacteria can find its way in the drainpipe where it multiplies, leading to a slimy, ice blockage. You can try to unclog the condensate drainpipe by pouring bleach or vinegar. If it doesn’t clear up, you may need to call a professional AC unit technician to inspect and clean the drain line.

  1. Damaged Drain Pan

The function of the drain pan is to collect condensate from the evaporator coils. Most of the condensate pans are made of metal or plastic, which are prone to breakage and rust. A damaged condensate tray will leak water instead of holding it safely.

  1. A Broken Condensate Pump

Some air conditioning units utilize gravity to drain water, while others require unique pumps to remove water from the condensate tray. If the pump breaks down, the water in the condensate pan will eventually overflow.