Why Is My Air Conditioner Leaking Water Inside My Home?

May 20, 2015

AC leaking water inside your home? Clearly, that’s a problem, folks.

Hey, at least you’re not alone–it’s a fairly common central AC problem. And we’ll break down the 2 most common causes.

They are:

  • Condensate drain line problem
  • Frozen evaporator coil

First, you should turn off your AC to prevent serious water damage and hazardous electrical issues.

Now lets look into both of these in a little more detail.

Condensate drain line problem

In order to cool the air inside your home, your system blows air over your inside unit’s cold evaporator coil.

When warmer air meets cold coils, condensation happens and droplets form on the evaporator coil. Normally, the water is collected in a drain pan, which connects to a “condensate drain line”.

But a problem in that drain can let water into your home. Here are the most common condensate drain line problems:

  • Clogged drain pipe: If the drain pipe can gets clogged, the water will back up into your home.
  • Rusted drain pan: Your drain pan may be rusted through and allowing condensation to fall through the pan and into your home. 
  • Installation issues: If your AC is fairly new, the problem could be with the way your system’s condensate trap was installed. 

Frozen evaporator coil

Remember that cold evaporator coil that condensation forms on? When there’s a problem with your AC, it can freeze. It can even freeze all the way down the refrigerant lines to the outside unit.

And when it melts, that’s a whole lot of unwanted water in unwanted places throughout your home.

A frozen coil is a symptom of another problem, like:

  • Dirty air filter
  • Low refrigerant
  • Another airflow problem

Read more about frozen evaporator coils

What next?

Water leaking into your home from your air conditioner is not good, whatever the cause.

We recommend shutting off your AC and getting the problem solved ASAP. As always, a trusted HVAC professional is the safest way for an effective and immediate solution.

If you live in the Kansas City area, contact Santa Fe Air Conditioning & Heating for help

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