AC Leaking Water in Palo Alto

AC Leaking Water in Palo Alto

A leaking AC is a drainage failure, not a failing system. The coil pulls moisture out of the air, that water collects and drains away, and when the drain clogs or a pan or pump fails, the water overflows instead. Finding which part failed is the whole job, and on most homes it is exactly one part.

Palo Alto's housing shapes where that water appears. The Eichler tracts sit on slab with post-and-beam ceilings, so there is no attic and no traditional ducted air handler. Cooling in those homes is commonly a ductless mini-split, and a leaking head means the small condensate line behind the wall has clogged or lost its slope. In the Spanish revivals of Old Palo Alto and the Midtown infill, you are more likely to have a closet or attic air handler with a conventional pan and drain. The diagnosis differs by house, so we identify the system before we touch anything.

A leak is a small fix on either kind of system. We put the cause and cost on paper first and do the repair clean.

Common causes

Clogged mini-split condensate line. The thin drain line behind an Eichler wall head clogs with algae or kinks, and water drips from the base of the indoor unit. We clear the line with low-pressure air or vacuum and check the slope of the full run. We confirm water moves through the head freely before we close up, and we do not open finished walls unless the line itself is confirmed at fault.

Condensate pump failure. Slab Eichlers with no gravity drain path often use a condensate pump to lift water out. When the float sticks or the motor quits, water overflows fast. We test the pump and its float, clean or replace it, and verify it cycles under an actual water load.

Clogged drain line on ducted units. In the Spanish revival and Midtown homes with conventional air handlers, the drain line silts up and the pan overflows. We vacuum and flush the line, check the trap, and confirm flow through the pan, the same fix that resolves most ducted leak calls.

Cracked or overflowing drain pan. Aging pans rust or crack, or a secondary pan fills because the primary drain failed. We inspect both pans, pin down whether the pan or the drain is the real source, and quote the correct repair rather than sealing a pan that will fail again.

Frozen coil melting off. Low refrigerant or restricted airflow ices the coil, which floods when the system shuts down. We read the charge on gauges and check the filter and blower. The water is the symptom of a charge or airflow problem, and that is what we actually correct.

How we diagnose it

• Identify the system type first, since an Eichler mini-split and a Spanish-revival ducted handler leak through entirely different paths.
• For mini-splits, clear the condensate line and check the slope of the full run before considering any wall access.
• Test the condensate pump and float where one is present and confirm it lifts water under load.
• Check refrigerant charge, filter, and blower to rule out a frozen coil behind the leak.
• Provide a written estimate before any work, with the $75 diagnostic credited toward repairs over $200.

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

AC Leaking Water in Palo Alto: common questions

Nearby and related

AC Leaking Water near Palo Alto: Menlo Park · Los Altos · Mountain View .

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