AC Leaking Water in Moraga

AC Leaking Water in Moraga

An AC is built to shed water down a pan and out a drain line, never onto the floor or down a wall. When you find water around the indoor unit, the drainage path failed. Most often it is a clogged line. It can also be an overflowing pan, a stuck float, or a coil that froze and melted. It is rarely the heart of the system, and usually one part we can isolate on the first visit.

Moraga's valley sits back from the hot inland edge, so summer afternoons are warm without being brutal and the AC runs at a moderate pace rather than flat-out. The housing matters more than the weather here. A good share of Moraga homes are older ranches on larger hillside lots, and on those lots the air handler often sits in a cramped crawl space or attic with a long, awkward drain run. A line that sags between joists holds water, grows a clog, and backs up into the pan. Hillside routing also means that water can travel before you ever see it.

The fix is almost always inexpensive. We are clearing a line, re-pitching a sag, or replacing a cheap part. The thing to avoid is letting a slow leak run for days into crawl-space framing or a finished ceiling. Shut the system off when you see water and call. Our diagnostic is $75, credited toward any repair over $200.

Common causes

Clogged condensate drain line. The most common cause. Algae and dust plug the PVC and the pan overflows. We vacuum the line at its termination, blow it clear, flush it, and confirm flow all the way out. On Moraga's long crawl-space runs we follow the whole path, not the visible end alone.

Sagging drain line holding water. On hillside ranches the drain often runs a long way through a crawl space, and a section that has lost its slope holds standing water that clogs and backs up. We find the sag, re-support and re-pitch the line so it drains by gravity the way it should.

Overflowing or rusted drain pan. Older pans under these long-serving systems rust through or overflow once the primary line clogs. We inspect and clear the pan, replace it if it is corroded, and trace upstream to whatever blockage started it.

Failed float switch. The safety switch that should shut the AC off when the pan fills can stick or quit. If it fails to trip, the unit keeps overflowing. We test it, confirm it cuts the cooling call, and replace it if needed. A small part that prevents framing and ceiling damage.

Frozen evaporator coil. A dirty filter or low refrigerant ices the coil, and the melt overruns the pan. We check the filter and blower airflow first, then read refrigerant pressures with gauges. We find the reason it froze rather than blindly adding refrigerant.

How we diagnose it

• Shut the system down and locate the water source, including following the drain run through the crawl space or attic.
• Inspect the air filter and check blower airflow, the usual cause of a frozen coil.
• Clear and flush the condensate line, check it for sags that hold water, and confirm it drains outside.
• Test the float switch so the system shuts off before the pan overflows.
• Read refrigerant pressures with gauges if there is frost or weak cooling.

$75 diagnostic, credited toward any repair over $200. You get a written quote before any work begins.

AC Leaking Water in Moraga: common questions

Nearby and related

AC Leaking Water near Moraga: Orinda · Lafayette .

This is usually a ac repair in Moraga job. See our ac repair overview or the Moraga service area.