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Water near the AC

Water Leaking from My Indoor AC Unit

A puddle by the air handler or a stain on the ceiling below an attic unit needs attention soon, since water damage spreads quietly. Most leaks trace back to the condensate system.

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Technician replacing the filter behind a return air grille

Quick answer

Air conditioners pull moisture out of humid air, and that water normally drains away through a pan and a small pipe. Indoor leaks tend to trace back to a drain line plugged with slime, a pan that has cracked or rusted, a failed condensate pump, a disconnected fitting or a coil that froze and then melted. Looking at the drain line and checking the filter are good first steps.

What may be going on

Possible causes

  1. Clogged condensate drain

    Algae, sludge and dust collect inside that narrow pipe over months of cooling, and eventually the water has nowhere to go but over the edge.

  2. Damaged drain pan

    Pans age too. Metal ones corrode into pinholes and plastic ones split, so water drips onto the floor, the attic decking or a basement slab.

  3. Condensate pump failure

    Homes where the unit sits below the drain point rely on a small pump. If it stops, water rises in its reservoir and overflows.

  4. Frozen coil melting

    Ice on the indoor coil eventually melts all at once, sending more water than the pan was built to handle.

  5. Loose or disconnected drain fitting

    A drain pipe that separated at a joint, often after someone moved stored items near the unit, will drip right at the connection.

Safe checks you can make

  • Switch cooling off at the wall control so no new condensation forms while you investigate.
  • Follow the drain line to where it exits outside or into a floor drain, and see whether water is coming out while the system runs.
  • Look at the drain pan with a flashlight, without removing any panels, to see whether it is full or visibly cracked.
  • If there is a condensate pump, check that it is plugged in and listen for it running.
  • Check the air filter, since a clogged filter can freeze the coil and lead to sudden meltwater.

What not to do

  • Don't open the air handler panels or reach into the unit to clear a clog.
  • Don't keep running cooling while water is spilling, especially in an attic over finished ceilings.
  • Don't chip at any ice you find on the coil; let it thaw with cooling turned off.

When to call a professional

When the drain line is clearly flowing and water still appears, or when the pan itself looks damaged, it is time for a technician. A ceiling stain under an attic unit also calls for prompt attention, because the water has already traveled past the pan.

Basements, crawlspaces and attics in Birmingham, AL homes each hide leaks in different ways. Call to get connected with an independent local HVAC provider who can clear the drain, test the pump or replace a failing pan.

  • Water stains or sagging drywall on a ceiling below the unit.
  • The pan is full and the drain line outside stays dry.
  • The condensate pump runs constantly or not at all.
  • Leaking keeps coming back after the drain was cleared.

What an HVAC provider may inspect

  • Drain line flow and any clogs or sags in the pipe
  • Primary and secondary drain pan condition
  • Float switch or overflow safety switch operation
  • Condensate pump function and discharge line
  • Coil temperature and airflow to rule out freezing

Keeping it from happening again

Having the condensate line flushed and the pan inspected during routine HVAC maintenance stops most clogs before they overflow. In damp months, a home that stays sticky even with the AC on may benefit from talking with a provider about whole-home dehumidification.

Where to go next

Related serviceAC Repair

Frequently asked questions

AC Leaking Water: questions homeowners ask

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Yes. A small, steady drip from the drain pipe outside during cooling is exactly what should happen, since that is where condensation leaves the home. The concern is water appearing indoors, around the air handler, or a drain that never drips on a humid day.

Water that pools under a unit or soaks into drywall and insulation can encourage mold growth over time, especially in humid weather. Drying the area quickly and fixing the source of the leak matters more than any cleanup product.

A float switch sits in the drain pan or drain line and shuts the system off when water rises too high. If the AC suddenly stops on a humid day, a tripped float switch may be protecting the home from an overflow, and the drain should be checked.

Still not sure what's wrong?

Call and describe what you're seeing. You'll be connected with an independent HVAC provider serving homes in the Birmingham, AL region.

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