Condensate Leak in the Attic in Orinda

Condensate Leak in the Attic in Orinda

Orinda is sheltered from the bay breeze, so its summers run warmer than the coastal towns. The AC actually gets used here, and on a lot of the older hillside homes the air handler lives up in the attic. When it runs through a warm stretch it produces real condensate, and if the drain can't carry that water away, it ends up on the ceiling of the room below.

Almost every time, this is a fixable problem. The water comes off the cooling coil into a pan, and a drain line is supposed to carry it out. Block that line, lose the pump, or crack the pan, and the water rises until the emergency pan and float switch catch it, assuming those were installed and still work. On Orinda's older retrofits, the secondary protection is often missing, which is why a slow clog turns into a stained ceiling instead of a system that shuts itself off.

Access matters here more than in flat-tract neighborhoods. Orinda attics on grade-separated lots can be tight and awkward to reach, and a drain line routed through old framing has more elbows where debris collects. We scope the run, find the actual blockage, and fix the cause rather than just mopping the pan.

Common causes

Clogged primary condensate line. The most common one. Algae plugs the drain, usually at the trap, and water backs up into the pan and over. On Orinda's longer line runs through hillside framing, the clog often hides at an elbow well downstream. We clear it from the termination, confirm flow, and add a cleanout if the line wasn't built to be serviced.

Missing or stuck float switch. The float switch is supposed to kill the system before the pan overflows. On a lot of older Orinda attic units it was never wired in, or the switch corroded and stuck open. We test it by raising the float and watching for shutdown, and install a proper one on the pan and secondary drain if it's absent.

Failed condensate pump. Where the attic unit sits too low to gravity-drain down the hill grade, a pump lifts the water out. When that pump fails or its check valve sticks, water collects fast. We test the pump under load, replace it if it isn't lifting, and confirm it has a safety switch wired to shut the AC down on a backup.

Cracked primary pan. Steel pans rust and plastic pans crack with age. Once the pan itself leaks, a clear drain doesn't help, the water goes straight through. We inspect with a light and mirror, and replace the pan if it's compromised. On an older coil we'll give you the honest call on whether the pan or the whole air handler is the real fix.

Unit out of level on a hillside platform. Hillside settling and original install shortcuts leave attic units sitting off level. The pan then holds water at the low corner and spills there even when the drain is clear. We level the unit, shim or re-set the platform, and make sure the pan drains toward the fitting.

How we diagnose it

• Confirm the water is condensate from the attic air handler, not a roof leak finding the same ceiling bay on a hillside roof.
• Inspect both pans and drain lines for standing water, rust, cracks, and a functioning trap.
• Lift-test the float switch and verify the system actually shuts off; note if there's no switch at all.
• Clear and flow-test the primary line, and bench-test the pump and its safety switch where the unit can't gravity drain.
• Level the unit on its platform and verify the pan slopes to the drain.

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

Condensate Leak in the Attic in Orinda: common questions

Nearby and related

Condensate Leak in the Attic near Orinda: Lafayette · Moraga .

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