AC Leaking Water in Pleasant Hill

AC Leaking Water in Pleasant Hill

An AC system pulls moisture from your air, collects it in a pan, and drains it away as condensate. Water near the indoor unit means that drainage has stopped working. The line is clogged, or the pan cracked or overflowed, or the pump failed, or the float switch that should have caught it stuck. It is almost always one part, and the system itself is usually fine.

Pleasant Hill's inland heat puts a real load on AC. Summers here run hot from late spring into fall, so these systems run long and hard and move a lot of condensate through their drains. A drain line that was marginal clogs when it finally has to carry that volume, and a worn pan that held up through mild years finally overflows.

The housing makes the leaks worse to reach. A good share of the older Pleasant Hill tracts are 1950s and 60s ranches with ductwork and air handlers crammed into tight attics and shallow crawl spaces. Those low, cramped runs are where condensate lines slime up and back up. Newer hillside homes tend to run multi-zone systems where a stuck damper can freeze a coil. Either way, we find the failed part and put the fix on a written estimate first.

Common causes

Clogged condensate drain line in a tight crawl space or attic. The leading cause in the older Pleasant Hill ranches. The cramped, low-pitch drain runs in these homes clog with algae and back water up into the pan. We clear the line with a wet vac and flush it through, confirm free drainage, and add a treatment tab at the cleanout when there is one.

Frozen evaporator coil from the summer load. With AC running hard in the inland heat, a dirty filter or low refrigerant charge freezes the coil, and when it thaws it sheds far more water than the pan holds. We check the filter and airflow and read refrigerant pressures and coil temperature to find why it iced up instead of only clearing the puddle.

Cracked or overflowing drain pan. A clogged line or an aged, cracked pan spills water from the air handler. We inspect the primary and secondary pans, clear the secondary drain, and replace a pan that has cracked or rusted through, common on the original equipment in these older homes.

Stuck float safety switch. The float switch should shut the AC down when the pan fills. Stuck open, the system keeps running and floods; stuck closed, the AC won't start. We test it and replace it if it isn't making and breaking the circuit correctly, then confirm it stops the unit.

Failed condensate pump. Where an attic or closet handler can't drain by gravity, a condensate pump moves the water out. A dead motor or stuck float backs it up and overflows. We test the pump with its reservoir filled and replace it when it won't run.

Stuck zone damper freezing a coil on a multi-zone system. On the multi-zone systems in the newer hillside homes, a damper stuck closed starves one coil of airflow until it freezes, then floods on thaw. We check damper operation as part of the diagnosis so the coil doesn't just freeze again after we clear the water.

How we diagnose it

• Pull the filter and confirm airflow, since restricted airflow drives the coil freezing that's common under heavy summer load.
• Access the attic or crawl space air handler and clear and flush the condensate line, confirming it drains.
• Read refrigerant pressures and coil temperature to rule out a frozen coil.
• Inspect primary and secondary pans and test the float switch and condensate pump.
• Check zone damper operation on the multi-zone hillside systems, since a stuck damper freezes a single coil.

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

AC Leaking Water in Pleasant Hill: common questions

Nearby and related

AC Leaking Water near Pleasant Hill: Walnut Creek · Concord · Lafayette · Martinez .

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