Why Is My Air Conditioner Leaking Water?

Have you ever walked outside to find the condenser unit of your air conditioner leaking water? Maybe you noticed an abnormal amount of water leaked indoors after your AC runs for an extended period of time—whatever the case, if your air conditioner leaks water, it’s important to schedule AC repair immediately.

You can expect your air conditioner to leak some water when it runs. But, it’s important to understand the difference between an expected amount of water and when your air conditioner is leaking too much. Keep reading to learn why your air conditioner leaks water and when to call an HVAC professional for help.

6 Reasons Your Air Conditioner Leaks Water

The following issues can all be the cause of your central air conditioner leaking water:

  1. A clogged condensate drain – from time to time your condensate drain may become partially blocked or completely clogged due to a buildup of dirt, rust, algae, and other debris.
  2. Disconnected drain line – if your air conditioner was improperly installed, its drain line can loosen over time and cause the pipe to disconnect from its connection within your air conditioner. Similar to when the condensate drain is clogged, a disconnected drain line may cause your air conditioner to leak.
  3. Cold temperatures – typically a problem near the end of cooling season, especially in Philadelphia and its suburbs, is running your air conditioner when it’s too cold outside. If your air conditioner attempts to cool your home when outdoor temperatures drop below 60 degrees Fahrenheit, the cooling coils may ice up and cause your air conditioner to leak water.
  4. Cracked condensate drain – over time your condensate pan may rust and crack. When this happens, your drain pan is no longer sealed and could cause water to leak from your air conditioner.
  5. Dirty air filters – A dirty air filter restricts airflow over the evaporator coils. As a result, the coils get too cold and freeze over. When they melt, excess moisture drips into the condensate pan and cause it to overflow.
  6. Low refrigerant levels – Similar to a dirty air filter, low refrigerant levels result in a low amount of pressure in your air conditioning system, causing the evaporator coils to freeze over. If your evaporator coils freeze, it could cause the drain pan to overflow and leak water.

How Much Water Should I Expect My AC to Leak?

During operation, your air conditioning unit will produce small amounts of condensation. How much water leaks from your air conditioner, however, depends on a couple of factors, including the thermostat setting and the temperature outside.

Small amounts of condensation near your AC’s drain pipe is normal and to be expected. When your air conditioner works hard during extrememly hot and humid days you can expect to see more water leaking than average. A small puddle underneath the condensing unit is most likely the result of normal operation.

If your water leak continues for more than 24 hours, call a professional air conditioning contractor to inspect your unit.

Schedule AC Repair in Philadelphia

For help with a leaky air conditioner in Philadelphia, call the experts at W.F. Smith to fix the problem.

Everyone, with whom I had personal or telephone contact, was agreeable, helpful and informative. Justin was the service person who initially diagnosed the problem, and represented Smith’s during the sales transaction. Shelly was my telephone contact, and Bill and Aaron did the install. Each person was professional and knowledgeable. Thanks,