AC Leaking Water
Quick Answer
Water leaking from your AC is usually caused by a clogged condensate drain line - this is a DIY fix in many cases. Other causes include a dirty air filter causing ice buildup, a damaged drain pan, or improper installation. Act quickly to prevent water damage.
Safe Checks You Can Do
- 1Turn off the AC immediately - This prevents more water from accumulating and potential electrical hazards.
- 2Check the air filter - A clogged filter can cause the evaporator coil to freeze and then leak water when it thaws.
- 3Find the drain line - Locate the PVC pipe (usually 3/4 inch) coming from your indoor unit and check for clogs.
- 4Try clearing the drain - Pour 1 cup of white vinegar down the drain line access point to break up algae and buildup.
Likely Causes
- Clogged condensate drain line
Algae, mold, and debris block the drain pipe, causing water to back up and overflow.
- Dirty air filter
Restricted airflow causes the evaporator coil to freeze, then leak when the ice melts.
- Damaged or rusted drain pan
Older units may have cracked or corroded drain pans that leak instead of draining properly.
- Frozen evaporator coil
Low refrigerant or airflow issues cause ice buildup that overwhelms the drain pan when melting.
- Improper installation
If the unit isn't level or the drain line has improper slope, water won't drain correctly.
When to Call a Pro
- Water is leaking near electrical components
- The drain pan is cracked, rusted, or damaged
- You can't locate or access the drain line
- DIY drain cleaning didn't solve the problem
- The evaporator coil is frozen or iced over