AC leaking water inside: what to do

Central air

Water around an indoor air handler, furnace or ceiling

1. Stop cooling using a safe, dry thermostat or control if water is escaping into the home. Water may continue dripping from the existing collection or ice afterward.
2. Move possessions and contain drips only where it is safe. Keep clear of electrical parts and any sagging ceiling.
3. From a safe position, note whether water is under the cabinet, at a pipe, in a secondary pan, at a ceiling stain or around a condensate pump.
4. Photograph the location and record the equipment model, when it started, visible ice and whether cooling/airflow changed. Arrange HVAC service.

Carrier lists a blocked condensate drain, a damaged pan and a frozen evaporator coil among possible causes. The visible puddle does not distinguish them.

A secondary drain or pan holding water can be an overflow warning. Do not bypass a float switch to get cooling back, add refrigerant, open the cabinet or pour chemicals into an unidentified line.

Ductless / wall-mounted indoor unit

Water running down the wall or from the indoor outlet

Stop an active indoor leak and protect nearby belongings. A bent or blocked drain route, an installation problem or a dirty filter can be involved. You cannot confirm the cause from the outlet alone.

If the ordinary filter is safely accessible, follow the exact model’s cleaning instructions with the unit off. Do not open electrical covers or push tools into the drain.

Tell the installer whether water still comes from the normal outdoor drain, whether the leak started after installation/cleaning, and whether there is ice. Daikin directs drainage-path problems to the installer or service.

Portable air conditioner

Water under a portable unit or around its drain

1. Stop operation and inspect only from a safe dry position. Locate the unit’s model label and manual.
2. Check whether the floor is firm and level and whether a visible drain cap is loose or missing. Do not tilt the unit while running.
3. If the unit reports a full tank, follow its own draining procedure with a suitable container. Port locations, plugs and operating modes differ.
4. If a hose is used, compare its routing and connection with that model’s instructions. Persistent leakage, an inaccessible plug or suspected internal damage needs service.

LG identifies an unlevel portable unit and a loose/missing drain plug as possible causes. Rain can also enter some exhaust installations. These are checks, not a universal repair diagnosis.

A portable AC and a window AC can require different leveling arrangements. Do not copy a window unit’s tilt angle or drill a drain hole in the casing.

Window air conditioner

Window unit leaking into the room

Stop a leak entering the room. A mounting, drainage or rain-entry issue may be involved; water at the rear outside is a different observation.

Compare the installation with the manufacturer’s directions. Do not loosen a heavy unit or alter its angle while it is unsecured. Some models retain water for their designed operation, so do not drill an extra hole or remove a plug based on generic advice.

Use an installer if the mounting, outside access or support is uncertain. LG’s window-unit guidance specifies a different arrangement from its portable-unit guidance; those dimensions are not universal for other products.

Ice and water

Visible ice changes the next step

A frozen evaporator can release water as it melts. Stop cooling if ice is visible and arrange inspection, particularly if it returns or airflow is weak.

A restricted filter can be one cause, but ice does not prove low refrigerant or identify a repair. Use the model’s filter instructions for any ordinary accessible maintenance. Do not chip the ice, heat the coil or open refrigerant components.

Outdoor water

Outdoor drainage is not the same as an indoor leak

Water from a designed drain during cooling can be normal. Moisture can also collect on cold outdoor pipes; during heating, an outdoor heat pump can release water or steam during defrost.

Do not dismiss water entering the building, an unexplained large puddle or a recurring indoor leak as normal condensation. If the source is unclear, document it and ask the installer to check.

Service handoff

Give the technician observations, not a guessed cause

Record the equipment type, model, exact water location, active cooling/heating mode and whether it continues after stopping. Include visible ice, reduced airflow, a full-tank message, recent installation/cleaning and rain conditions.

Photograph accessible labels and the leak without removing panels. If the source is unknown, say so. A temperature-split reading is not a leak diagnosis.