If you’ve ever walked past your indoor AC unit and noticed a puddle forming underneath, you’re not alone. Many homeowners in Pleasanton run into this issue during the hotter months, and it can lead to bigger concerns if left unchecked. Water leaking from your air conditioning system might seem minor at first, but it’s often a sign that something isn’t working the way it should.
Leaks can damage your walls, flooring, and ceiling, especially if the problem has been lingering unnoticed. It’s also a strong hint that your AC may not be cooling as efficiently as it should. Whether it starts as a steady drip or full puddle, understanding where that water is coming from helps prevent further damage and lets you take the right steps toward a fix.
Blocked Drain Line
A clogged condensate drain line is one of the most common causes of AC water leaks in Pleasanton homes. When your AC pulls humidity from the air, that moisture collects and drains away through a pipe. Over time, that line can become blocked with dirt, algae, or small debris. Once clogged, there’s nowhere for the water to go, so it starts to back up and spill into your home.
Signs your drain line might be blocked include:
– Water pooling directly under the indoor unit
– A musty smell around the system from stagnant water
– AC unit turning off without warning or not turning on at all
– Visible algae or buildup around the drain hose
Trying to clear the drain yourself without the proper tools and expertise could cause more damage. The positioning of the line means bending or forcing it might create cracks or dislodge it completely. The better option is to have our technicians safely remove the blockage and check that water is draining as it should. Scheduling professional cleanings before and during peak summer use can help keep your AC running reliably.
Frozen Evaporator Coils
Frozen evaporator coils are another frequent cause of leaks. It may seem odd during a warm day, but when your system doesn’t get enough airflow or when refrigerant levels are too low, the coils can freeze. The ice then melts, and the resulting water overflows past the drain pan, creating a leak.
Reasons evaporator coils can freeze include:
– Low refrigerant levels that drop coil temperature too far
– Dirty air filters or blocked ducts that restrict airflow
– Broken or slow fans that don’t move enough air across the coils
If your system starts blowing warm air, shuts down at odd times, or struggles to maintain temperature, frozen coils could be to blame. Ice buildup often causes wear over time, even before leaks are noticeable. Our professionals can check refrigerant levels, investigate airflow issues, and identify problems in the fan or sensors. Catching it early helps avoid long-term system damage.
Damaged or Disconnected Drain Pan
The drain pan under your indoor unit collects condensation as your AC cools the air. That water should move to the condensate drain line and out of your home. But when the pan is cracked, rusted, or tilted out of place, water can spill out unchecked. Even tiny cracks or mild rust around the drain pan can lead to widespread problems if the water spreads without being noticed.
Drain pans wear out with time. Here are common signs of a faulty or damaged drain pan:
– Water collecting under the AC, even when turned off
– Rust particles or flaking metal near the unit
– Yellow or brown water stains around walls or ceilings
– Visible cracks or shifts in the pan’s alignment
Most homeowners don’t have clear access to this area without special equipment or disassembling the unit. That’s why inspections by our technicians are the safest approach. We can remove panels, inspect the condition of your pan, and make repairs on the spot to stop further leaks or corrosion.
Incorrect Installation or AC Sizing
Even if every piece of equipment is working correctly, poor installation can still create water leaks. If the AC unit is too large for your home, it may cool too quickly. This causes short cycles and prevents moisture from draining properly. A system that’s too small struggles to handle the air volume and may run continuously, collecting more condensation than it can manage.
Other installation issues include:
– Misaligned or flat drain pipes that trap water
– Loose or unsealed connections between ductwork and the AC unit
– AC units that are not level, causing water backup in the drain pan
In Pleasanton, homes vary widely in layout and square footage, and some may have been remodeled since the AC was first installed. If problems continue despite repairs, the system’s size or setup may no longer match your home’s cooling demands. In this case, a site inspection helps determine if your AC is still appropriate for your home’s layout. Our technicians can run an airflow analysis and check if equipment, ductwork, and drainage are properly configured.
Keeping Comfort On Track in Pleasanton
Water leaks from your AC can be more than a small mess. Left alone, they can cause damage to drywall, flooring, and even internal electrical parts. When summer temperatures in Pleasanton rise, you count on your AC to keep your house dry and cool around the clock. A leak interrupts that comfort and adds unnecessary repair costs if overlooked.
Knowing why your AC is leaking helps you take control quickly. Whether caused by a clogged drain, frozen coil, cracked pan, or a mismatch between system size and your home, early fixes prevent ongoing problems. For continued comfort and peace of mind, AC repair in Pleasanton done by experienced professionals is the key to keeping your system running smoothly through the peak heat.
If you notice signs that your AC is not functioning properly, professional AC repair in Pleasanton can address leaks and other issues before they escalate. Dukes Heating & Air Conditioning LLC understands how important it is to keep your home cool and dry during the warmer months. For a quick estimate or to book a service visit, please contact us today.
