AC Leaking Water in Piedmont

AC Leaking Water in Piedmont

Air conditioning makes water as it cools, dropping condensate into a pan that drains away. When water shows up near the indoor unit, that drainage has failed somewhere. The line clogged. The pan cracked or overflowed. The pump died, or the float switch stuck. It points to one fixable part, not a failed system.

Piedmont's housing changes where these leaks come from. A lot of these are older plaster-walled homes built for heat, not cooling, with the AC retrofitted decades after the house went up. That means condensate drainage was often shoehorned into a structure that wasn't designed for it. Drain lines run through plaster walls and finished basements, air handlers sit in tight closets and converted attic space, and the routing is frequently long and improvised. Those are the lines that clog and the pans that overflow.

Cooling has historically been an afterthought up in these Oakland hills, with a mild climate and light load, but the systems still pull moisture every time they run. With AC tucked into a finished older home, a leak can soak plaster and hardwood before anyone sees standing water. We trace it to the source and quote the repair before any work.

Common causes

Clogged condensate drain line. The most common cause, and the retrofitted, often long drain runs in these homes clog readily. We clear the line with a wet vac and flush it through, then confirm it drains free. Where the original install ran the line poorly, we'll note a better route on the estimate.

Failed condensate pump in a basement or closet handler. Air handlers added to finished basements and interior closets usually can't drain by gravity, so they use a condensate pump. A burned-out motor or stuck float backs water up and overflows. We test the pump by filling its reservoir and replace it when it won't run. It is an inexpensive part.

Cracked or overflowing drain pan. A clogged line or a cracked pan spills water from the air handler, and in a plaster-walled home that water finds wood and lath fast. We inspect the primary and secondary pans, clear the secondary drain, and replace a pan that has cracked or rusted.

Stuck float safety switch. The float switch is supposed to shut the AC off when the pan fills, protecting the structure below. Stuck open, the system keeps running and flooding. We test it and replace it if it isn't breaking the circuit, then confirm it actually shuts the unit down.

Frozen evaporator coil on a neglected retrofit. Retrofit AC in these homes sometimes gets little maintenance, so a dirty filter or low refrigerant freezes the coil, and the thaw dumps more water than the pan holds. We read refrigerant pressures and coil temperature to find why it froze rather than just clearing the overflow.

How we diagnose it

• Locate the retrofitted air handler, whether it's in a closet, finished basement, or converted attic, and find where the water is escaping.
• Clear and flush the condensate line, tracing the often-long retrofit routing, and confirm it drains.
• Test the condensate pump that many of these basement and closet handlers depend on.
• Inspect primary and secondary pans and the float switch for cracks, overflow, and a stuck safety.
• Read refrigerant charge and coil temperature to rule out a frozen coil on an under-maintained system.

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

AC Leaking Water in Piedmont: common questions

Nearby and related

AC Leaking Water near Piedmont: Oakland · Berkeley · Alameda .

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