Frigidaire Room Air Conditioner Leaking Water Inside

A damp patch on the floor under the window, a drip down the wall, or a puddle in a portable unit’s base: water indoors is one of the most common complaints about room air conditioners. The unit pulls moisture out of the air, and the coil it condenses on is cold. That water has to run to a pan and out through a drain at the back. Anything that interrupts that path puts the water in your room instead.

Where the water comes from

Condensation forms on the cold front coil and drips into a base pan. Many window units then splash or drain that water over the outdoor coil to help cool it, and let the rest run out through a drain hole or channel on the rear. A through-the-wall unit does the same through its sleeve. A portable unit collects water in an internal reservoir or pushes it out through a drain hose. If any of those routes is blocked, tilted wrong or overwhelmed, the water finds another way out.

Common reasons for indoor leaks

• Wrong tilt. A window unit should slope slightly toward the outdoors so water runs outside. If it is level or leans inward, water pools and drips into the room.
• A blocked drain. Leaves, dust or algae block the drain hole at the base. Water backs up and overflows toward the room.
• A frozen coil. Ice builds when airflow is low. When it melts, more water arrives than the pan can handle, and it spills.
• A dirty filter. The cause of freezing in many cases, and a quiet cause of leaks in hot, humid weather.
• Very humid weather. A unit in a humid room collects more water than expected, and a small drain can fall behind.
• A cracked or displaced pan. After a move or years of use, the pan or seal may allow a seep.
• A gap around the unit. Rain or condensation from outside entering through the window panels rather than from the unit itself.
• A portable unit with a full reservoir or a kinked drain hose. Water spills when the reservoir is full or the hose cannot drain.

Checks from the outside, in order

1. Switch the unit off and unplug it. Dry the floor and sill so a new leak is easy to see.
2. Look at the tilt with a level or a bubble phone app. Window units should tilt slightly toward the outdoors, never inward. If it leans inward, reposition it with another person helping, as the unit is heavy.
3. Pull and rinse the filter. A clogged filter can freeze the coil.
4. Look at the front coil for ice. If it is frosted, leave the unit off with the fan on until it thaws, with towels underneath.
5. Locate the drain hole on the base or rear. Clear any visible debris from outside the unit without poking deep inside.
6. Check the window seal and side panels. If outdoor rain is entering, the unit may not be the source.
7. For a portable unit, empty the reservoir and straighten any drain hose, letting it run downhill.

Do not open the cabinet to reach the pan, and do not drill extra drain holes. Water near an outlet and plug is a hazard. If water has reached the outlet, the cord or the power strip, switch off the breaker before touching anything, and keep the unit off until a technician has looked at it.

How installation makes the difference

In many Bay Area buildings, windows are narrow double-hung sashes that slope inward, and the sill may not be level. A unit set into such a sill can lean the wrong way without anyone noticing. Through-the-wall units depend on a sleeve that must be sound and pitched slightly outward; a cracked sleeve or one stuffed with old insulation can cause an indoor leak even on a perfectly good unit. If you rent, tell your landlord or property manager about a sleeve problem rather than adjusting it yourself.

Leak or cooling problem?

Leaks and weak cooling often come together, because a freezing coil does both. If the room is warm as well as wet, read about a room air conditioner that runs but doesn’t cool. If the drip appears only on the hottest, most humid days and stops when the weather cools, a partly blocked drain is likely.

Protecting the room while you wait

Until the cause is found, keep the unit off, set a towel and a shallow tray under the front, and move rugs, books and anything that soaks up water away from the sill. Mop up any damp wall base promptly, because a slow drip can lift paint and swell trim. If the unit sits above a shared floor in a condo or an upstairs flat, let the property manager know early so a neighbor below does not discover a stain first.

Which models this covers

The same checks apply to the room air conditioners, such as the FHTC105WC1, FHTC145WC2 and FHWC056TF1. The label is usually on the side panel or behind the front grille. Our Frigidaire air conditioners guide shows how window, wall and portable units differ.

What we do on a visit

A technician checks how the unit sits, traces the water path from coil to pan to drain, looks for ice and for cracks in the pan or seal, and runs the unit to see where the water goes. If the cause is a part, such as a cracked pan or a failed fan motor that lets the coil freeze, you receive a written estimate before any repair. Nothing is repaired without your approval. See Frigidaire air conditioner repair for what to expect, and keep the model number ready.

Frequently asked questions