Condensate Leak in the Attic in Concord

Condensate Leak in the Attic in Concord

Concord runs its AC hard through the summer, and a system pulling load on a hot afternoon makes a steady stream of condensate. That water has to drain somewhere. When the primary line clogs or the pump quits, the water has nowhere to go but the emergency pan, and if that fills, it ends up on your ceiling. The stain usually shows up directly under the attic air handler, often in a hallway or a bedroom closet.

The thing to know is that this is rarely a dead system. The compressor and the refrigerant charge are usually fine. What failed is an inexpensive drain line, a float switch that should have shut the unit off, or a condensate pump that burned out. Those are all fixable in one visit. The water damage on the ceiling is the part that costs real money, so catching it early matters.

In Concord's older tract homes, the air handler often sits in the attic over a finished ceiling with the drain running a long, near-flat path to an exterior wall. That long flat run is where the algae and sludge collect. We see this pattern across the central Concord and Ygnacio Valley tracts every cooling season.

Common causes

Clogged primary condensate drain line. Biological growth builds up inside the drain line over a season and chokes it off. Water backs up into the primary pan and overflows. We clear the line with a wet vac and compressed air, flush it, and confirm it drains freely before we leave. On the long near-flat runs common in Concord attics, we also check the slope so it does not re-clog in a month.

Failed or missing float switch. The float switch is supposed to shut the system off when water rises in the pan, before it ever reaches your ceiling. A lot of older Concord installs never had one, or it failed closed. We test it by raising the float and confirming the system cuts out. If there isn't one, we add it. It is cheap insurance against a four-figure drywall repair.

Failed condensate pump. When the drain can't run to gravity, a small pump lifts the water out. These motors burn out and the floats stick. The pan fills the moment the pump stops. We test the pump under power, check the check valve, and replace the unit if it's done. We bring common pumps on the truck.

Cracked or rusted-through primary pan. On systems past 15 to 20 years, the metal pan under the coil corrodes and the plastic ones crack at the seams. Water then bypasses the drain entirely. We inspect the pan with a light and a mirror, and if it's compromised we price a replacement on the written estimate, since it means pulling the coil.

Improper pan slope or sagging handler. If the air handler shifted or was never set level, the pan tips the wrong way and water pools at the back instead of running to the drain. Common when a handler sits on attic joists that have settled. We shim and re-level the unit so the pan drains to the fitting the way it was designed to.

Frozen coil thawing all at once. A low charge or dirty filter ices the coil, and when it thaws it dumps more water than the drain can handle. The leak looks like a drain problem but the root cause is upstream. We check filter, airflow, and charge so we fix the actual cause behind the symptom.

How we diagnose it

• Inspect the attic air handler, primary pan, and emergency pan for standing water and staining, and trace the ceiling stain back to its source.
• Test the float switch by lifting the float to confirm it shuts the system down.
• Clear and flush the primary drain line, then verify it runs freely to the termination point.
• Check the condensate pump under power if the system uses one, including the float and check valve.
• Confirm the pan is level and sloped to drain, and check filter and charge so a frozen coil isn't the real cause.

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

Condensate Leak in the Attic in Concord: common questions

Nearby and related

Condensate Leak in the Attic near Concord: Walnut Creek · Martinez .

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