AC Leaking Water in Richmond

AC Leaking Water in Richmond

Richmond runs cool most of the year, so AC doesn't get pushed as hard here as it does inland. That fools people into thinking a puddle under the air handler is a small thing. It usually is small, in the sense that it is one cheap part, but water sitting against a closet floor or a garage wall does real damage if it runs for weeks. Most of the calls we get in Richmond are for slow drips that finally showed up as a stain, not for a flood.

The cause is almost always the condensate path, not the cooling itself. An AC pulls humidity out of the air, that water collects in a pan under the evaporator coil, and it drains out through a small line. When that line clogs with the algae and dust slime that builds up in a damp coastal climate, the pan fills and overflows. The system keeps cooling fine, which is why people leave it until they see water.

On Richmond's older post-war stock, a lot of these systems are tucked into a hall closet or a tight garage corner where the drain line was run short and flat. Flat lines clog faster. The fix is rarely the whole system. It's a cleared line, or a new float switch, or a pan, and we tell you which before we quote it.

Common causes

Clogged condensate drain line. The most common one by far in a humid bay climate. Algae and dust build a plug in the drain line, the pan backs up, and it overflows. We clear it with a wet vac at the line termination and flush it, then confirm the pan empties. If there's no cleanout tee, we add one so the next clean is easy.

No float safety switch installed. Many older Richmond closet and garage installs never had a float switch. That's the part that shuts the system off before the pan overflows. We add one on the secondary drain or the pan itself. It's an inexpensive part that turns a flood into a no-cool call you notice right away.

Cracked or rusted-through drain pan. On systems past 15 years the metal secondary pan rusts or the plastic primary pan cracks at a seam. Water then bypasses the drain entirely. We confirm by drying everything and watching where the water actually originates, then replace the pan.

Drain line pitched wrong or sagging. A flat or back-pitched line holds water and clogs repeatedly. Common on tight closet installs where the line was run short. We re-pitch it so it drains by gravity, or reroute it to a proper termination.

Frozen coil melting off. Less common here given the light cooling load, but a low refrigerant charge or a dirty filter can ice the evaporator coil. When it melts, it dumps more water than the pan can take. We check filter, airflow, and charge before assuming the drain is the only issue.

How we diagnose it

• Find the actual water source: dry the pan and surrounding floor, run the system, and watch where water first appears.
• Inspect the primary and secondary drain pans for rust, cracks, and standing water.
• Test the condensate drain line for flow, then clear and flush it if it's plugged.
• Confirm a working float safety switch exists, and add one if it doesn't.
• Check filter, coil, and refrigerant charge to rule out a frozen coil as the water source.

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

AC Leaking Water in Richmond: common questions

Nearby and related

AC Leaking Water near Richmond: Berkeley · Oakland .

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