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AC Water Leakage: Causes, Prevention and Repair

Indoor AC water leakage usually begins in the drainage path, but it can also follow coil icing, poor installation slope, drain-pump trouble or heavy dirt buildup. Water near wiring, ceilings or furniture should be handled quickly to limit damage.

AC Water Leakage: Causes, Prevention and Repair

Step-by-Step Checks

Switch off the ACStop the unit if water is reaching electrical points, the false ceiling, wall finishes or furniture.
Check the drain outletA blocked or bent drain hose can prevent condensed water from leaving the indoor unit.
Look for icingIce that melts after shutdown can overflow the drain tray. Airflow and refrigeration symptoms should both be checked.
Inspect installation and pumpsCassette units may use drain pumps, while wall units depend on correct slope and a clear gravity drain.

When Professional Diagnosis Is Needed

Professional cleaning is appropriate when the drain line, tray, blower or coil is dirty. Repeated leakage after cleaning needs a closer check of installation slope, pipe insulation, drain-pump operation, coil icing and the route of the drain line.

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Frequently Asked

Questions About This Problem

Can a dirty filter cause AC water leakage?

A badly restricted filter can contribute to coil icing and later water overflow, although the drain path should also be checked.

Why does a cassette AC leak from the ceiling?

Possible causes include a blocked drain, drain-pump trouble, tray overflow, icing or an installation issue.

Should I run the AC while it is leaking?

Switch it off when water may reach wiring, ceilings or property, and arrange inspection.

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