Water near the unit
AC Leaking Water Inside the House
An air conditioner wrings a lot of moisture from muggy summer air. If that water has nowhere to go, it shows up on a floor, through a ceiling, or across a basement slab.
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Quick answer
Water leaking from an AC usually means the condensate drain line is clogged, the drain pan is cracked or overflowing, a condensate pump has stopped, or the coil froze and is now melting. A dirty filter can set off that last chain of events. Turn the system off, dry the area, and look at the drain line and pan without taking anything apart. Persistent leaks or water near electrical parts call for a technician.
What may be going on
Likely causes
Clogged condensate line
Algae, sludge and dust build up in the small drain pipe over time, especially in long, humid summers, until water backs up into the pan.
Cracked or rusted drain pan
Older metal pans corrode and plastic ones can split, letting water drip straight through instead of reaching the drain.
Condensate pump failure
In basements and some closets, a small pump lifts the water away. If its motor or float switch quits, the reservoir overflows.
Melting ice from a frozen coil
A coil that iced over from poor airflow or low refrigerant releases a flood of water as it thaws.
Disconnected or sagging drain pipe
A loose fitting or a line that sags and holds water can leak at the joint.
Safe first checks
- Turn the system off at the thermostat and mop up standing water.
- Look at the drain pan under the indoor unit for standing water, rust or cracks, without removing panels.
- Follow the condensate line to where it exits and see whether it is dripping during cooling.
- Where a condensate pump is used and the floor around it is dry, confirm its plug is seated.
- Check the air filter, since a clogged one can lead to icing and then leaking.
What not to do
- Don't open the air handler or remove the coil access panel.
- Don't run the system while water is near outlets, wiring or the furnace controls.
- Don't pour harsh chemicals into the drain line.
- Don't ignore a ceiling stain under an attic unit; it can spread quickly.
When to call
When to call a technician
If the drain line exit stays dry while the system cools, or the pan is full and won't empty, the blockage or failed part needs attention. Water near electrical connections is a reason to keep the system off until someone checks it.
A technician can clear the line properly, replace a pump or pan, and confirm the coil isn't freezing. Request AC repair on the call, and mention whether the unit sits in an attic, closet or basement.
- Water returns soon after mopping
- A float or safety switch keeps shutting the system off
- Ice visible on the refrigerant lines
- Musty smell or water stains on ceilings or walls
What a technician may inspect
- Condensate line flow and trap
- Drain pan condition and slope
- Condensate pump and float switch
- Coil temperature and signs of freezing
- Airflow and filter condition
Keeping it from happening again
Humid summers in the Ohio River valley keep condensate lines busy, so a clog is a common summer problem. Having the line flushed and the pan inspected during a yearly maintenance visit keeps water moving. Changing filters on time also lowers the chance of a frozen coil that melts into a leak.
Yes. A steady drip from the condensate line outdoors while the system cools is normal and shows the drain is working. Moisture by the indoor unit, on a ceiling, or across an indoor floor is what deserves attention.
It can. Even a slow leak can stain drywall, warp flooring, and encourage mold, especially from attic or upstairs units. Turning the system off and having the drain checked quickly limits the damage.
Melting ice can release water faster than the pan can carry it off. The freeze itself has a cause, often airflow or refrigerant, and that should be found to stop it from happening again.
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Still not sure what's wrong?
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