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AC Leaking Water Inside
in Chandler, AZ
Your AC pulls humidity out of the air and drains that water through a small pipe called a condensate drain line. In Chandler, monsoon season brings humidity spikes that push the system to drain more water than usual, which accelerates buildup inside the line. A blocked drain overflows into the pan and then onto your ceiling or floor, causing water damage that goes well beyond the AC repair itself.
Quick Answer
Water leaking from the indoor air handler in Chandler is almost always a clogged condensate drain line. The drain pulls moisture out of the air as the system runs, and algae or dust can block it. A technician clears the line and checks the drain pan for cracks. Do not let this sit because water damage to ceilings and drywall can follow quickly, especially in two-story homes. Call (928) 599-7684 to schedule a same-day look.
Telltale Signs
Warning Signs to Watch For
- Water stains on the ceiling below a second-floor air handler
- A puddle forming on the floor around the indoor unit or furnace closet
- A musty or moldy smell coming from the vents or air handler cabinet
- The AC shuts itself off before the house reaches the set temperature
- Visible rust stains or standing water in the drain pan under the air handler
Root Causes
What Causes AC Leaking Water Inside?
Clogged Condensate Drain Line
Algae, dust, and debris build up inside the drain line over time and eventually block the flow of water. During Chandler's July and August monsoon season, the system removes more moisture from the air than usual, so a partial clog that was manageable in May becomes a full blockage by mid-summer.
The Fix
Drain Line Flush and Clear
A technician uses a wet-vac or pressurized flush to clear the clog from the drain line and treats it with an algae tablet to slow future buildup. Most units also have a float switch that shuts the system off if the pan fills up, and that gets tested too.
Cracked or Corroded Drain Pan
The drain pan sits under the evaporator coil and catches condensation before it drains away. Older units, especially those installed before 2005 in neighborhoods like Dobson Ranch, often have plastic or sheet-metal pans that crack with age or corrode from constant moisture exposure.
The Fix
Drain Pan Replacement
A technician removes the old pan and installs a new one sized to fit the unit. This is a lasting fix because a cracked pan cannot be reliably patched for long-term use.
Frozen Evaporator Coil Melting
When airflow is restricted by a dirty filter or low refrigerant, the evaporator coil gets too cold and ice forms on it. When the system cycles off, that ice melts faster than the drain can handle and water spills over the pan. This happens more often at the start of summer when filters have not been changed since winter.
The Fix
Coil Thaw, Filter Replacement, and Root Cause Repair
The technician lets the coil thaw completely, replaces the air filter, and then finds why the coil froze in the first place. Fixing only the ice without addressing the airflow or refrigerant issue means the problem will repeat.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Clogged Condensate Drain Line | Cracked or Corroded Drain Pan | Frozen Evaporator Coil Melting |
|---|---|---|---|
| Water dripping steadily even when AC is running | |||
| Large flood of water after AC shuts off on its own | |||
| Musty smell and visible algae around drain line opening | |||
| Rust stains on floor below a pan that holds standing water | |||
| Ice visible on refrigerant lines near air handler | |||
| Float switch light on and system not running |
Free Inspection
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