Condensate Leak in the Attic in San Ramon

Condensate Leak in the Attic in San Ramon

An AC pulls moisture out of the air at the indoor coil, drips it into a pan, and drains it outside through a condensate line. In most San Ramon homes that air handler sits in the attic, directly above the upstairs bedrooms. When the drain clogs or the pan fails, the water has nowhere to go but down through the ceiling. A brown ring over a bed is one of our most common summer calls right here in our home city.

San Ramon sits inland in the Tri-Valley, where July and August regularly push past 95. Cooling is the bigger workload here than anywhere on the coast, and that runtime is what turns a slow drain into an overflow. The 1980s and 90s tract neighborhoods across Windemere, Twin Creeks, and the Dougherty Valley developments make up the bulk of these calls, with original equipment that's been running long enough for the drain line to fill with growth and the emergency pan to be the only thing left holding back a ceiling stain.

This is almost never the end of the system. A clog, a dead float switch, or a cracked pan is one fixable part. Because we're based in San Ramon, we get to these fast, find the real cause, and put the fix on a written estimate before we start.

Common causes

Clogged primary condensate line. Heavy Tri-Valley summer runtime grows slime in the drain line until it plugs. Water backs up over the pan and onto the ceiling. We clear it with a wet vac at the termination, flush the line, and add a serviceable access tee. On the older Windemere and Twin Creeks systems running daily through a heat wave, this is the leak we see most.

Float switch missing or jumpered. The float switch should shut the AC off the second the pan starts filling. On older San Ramon installs it's often absent, or a prior tech bypassed it to stop a nuisance trip instead of clearing the drain. We test it, and if there's no working safety we install one in the pan so the next clog kills the system before the ceiling gets wet.

Cracked or rusted primary pan. After 25 to 30 years, the metal pan under the coil rusts through, or the secondary pan cracks, and water bypasses the drain entirely. Many San Ramon tract homes are now at that age. We inspect both pans and, since these systems are often near replacement anyway, we give you the honest repair-versus-replace numbers rather than just gluing the pan.

Failed condensate pump. Some attic handlers rely on a small pump to lift water out where gravity drainage isn't possible. A failed pump overflows the pan fast. We test the pump under power, check its check valve and tubing, and replace it if it's seized, then confirm the pump's safety float is wired to shut the AC down.

Improper pan slope. If the air handler was set into the attic without a pitch toward the drain, water pools and leaks through a seam instead of draining. We level the unit and shim it so it drains to the outlet. This shows up on installs that were rushed into tight attic spaces decades ago.

How we diagnose it

• Confirm the ceiling stain is below the attic air handler and rule out roof and plumbing leaks with a moisture meter.
• Open the air handler and inspect the primary, secondary, and emergency pans for standing water, rust, and cracks.
• Test the float switch, and on pump-drained units test the condensate pump under power along with its safety float.
• Clear and flush the primary condensate line and confirm discharge outside.
• Level the unit and verify pan slope drains toward the outlet before closing up.

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

Condensate Leak in the Attic in San Ramon: common questions

Nearby and related

Condensate Leak in the Attic near San Ramon: Danville · Alamo · Dublin · Pleasanton .

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