Condensate Leak in the Attic in Alamo

Condensate Leak in the Attic in Alamo

Alamo gets hot. Summer afternoons here climb into the 90s, and the AC runs long hours June through September. On the bigger homes with the air handler up in the attic, all that runtime means the coil is condensing a steady stream of water. When the drain path fails, the leak shows up fast, and it shows up on a ceiling that's expensive to repair.

A lot of the Alamo homes we work on run multi-zone or dual-system setups to cover the square footage, and that often puts two attic air handlers in the house, each with its own pan and drain line. More units means more places for a clog, a stuck pump, or a float switch that tripped too late to put water where it doesn't belong. The reassuring part is the same as everywhere: a condensate leak is a drain-path part, not a dead compressor.

Heavy summer load is the aggravating factor. A drain line that limps through a light cooling season backs up quickly when an Alamo system runs flat-out in a heat wave, which is usually when these calls come in.

Common causes

Clogged primary condensate line under heavy runtime. High summer runtime means high water volume, and a partially clogged line that coped in spring overflows in July. We clear the blockage with nitrogen or a vacuum at the termination, flush the line, and verify the pan drains completely while the system runs at full load.

Failed condensate pump on a zone with no gravity drain. On multi-level Alamo homes, the upper-zone air handler often can't gravity-drain and depends on a lift pump. When the pump's float sticks or the motor burns out, the pan fills within an hour of hard cooling. We test and replace the pump, and confirm the discharge actually reaches a drain.

Float switch not cutting the system. On a dual-system house, it's easy for one unit to be missing a working safety switch. The pan overflows while the system keeps cooling. We lift each float to confirm the unit shuts down, and install a switch on any air handler that doesn't have a functioning one. This is the last line before a ceiling repair.

Cracked primary pan on aging equipment. Plenty of Alamo systems are 15-plus years old. The primary drain pan, often plastic, gets brittle and cracks, so water leaks past a clean line. We pull the coil access panel, inspect for cracks and warping, and replace the pan, matching it to the coil.

Improper pan slope on a settled platform. Long attic runs in older custom framing settle, and an air handler that's no longer level lets the pan hold water at the low end until it drips over. We level the unit, shim the platform, and re-seat the pan so it drains to the fitting.

Secondary drain line tied wrong or capped. Some Alamo installs route the emergency drain to a spot the homeowner never sees, or it was capped during a past repair. The first warning then becomes a ceiling stain instead of a visible drip. We confirm the secondary path is open and terminates somewhere noticeable, and pair it with a working float switch.

How we diagnose it

• Identify which of the home's systems is leaking and pull that air handler's access panel.
• Inspect the primary pan for cracks, warping, and standing water at the low corner.
• Lift the float switch on the affected unit to confirm it shuts the system off.
• Clear and flush the primary line, then run the system under full cooling load and watch the pan empty.
• On upper-zone units, test the condensate pump and confirm the discharge reaches a drain.

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

Condensate Leak in the Attic in Alamo: common questions

Nearby and related

Condensate Leak in the Attic near Alamo: Danville · Blackhawk · Lafayette · Walnut Creek .

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