AC Leaking Water

Common Symptoms

You might be experiencing this problem if you notice any of these signs:

• Water pooling around indoor air handler
• Dripping from ceiling below attic unit
• Wet spots on walls near vents
• Standing water in drain pan
• AC shuts off unexpectedly
• Musty smell from vents
• Water stains on ceiling
• Gurgling sounds from drain line

Step-by-Step Diagnosis

Follow these steps to identify the exact cause of your problem:

1. Turn off AC to prevent water damage
2. Locate indoor air handler and check drain pan
3. Look for standing water in drain pan
4. Find condensate drain line (usually white PVC pipe)
5. Check if drain line is clogged (blow into it)
6. Inspect float switch in drain pan
7. Verify drain line slopes downward continuously
8. Check if drain line exits outside properly
9. Look for ice on evaporator coils
10. Inspect air filter for severe clogging
11. Check if problem worsens on humid days
12. Note if AC has been running continuously

Most Common Causes (Ranked by Likelihood)

DIY Solutions

Step-by-Step Instructions:

1. Turn off AC at thermostat and breaker
2. Soak up standing water from drain pan with towels
3. Locate drain line access port (T-fitting with cap)
4. Pour 1 cup white vinegar into access port
5. Wait 30 minutes for vinegar to break down algae
6. Flush with 1 cup of water
7. Use wet/dry vacuum on outside drain end to suck out clogs
8. If drain won't clear, use drain snake or stiff wire
9. Clean drain pan with bleach solution
10. Reinstall everything and test by pouring water in pan
11. Turn AC back on and monitor for 24 hours
12. Pour 1 cup vinegar monthly to prevent future clogs

When to Call a Professional

Don't attempt DIY repairs if you experience any of these situations:

• Drain pan is rusted or cracked
• Drain line cannot be cleared after DIY attempts
• Water damage to ceiling or walls
• Condensate pump not working
• Drain line disconnected inside wall
• Severe algae or mold growth in unit
• Leak from unknown location
• Multiple recurring leaks

Prevention Tips

Stop this problem before it starts with these preventive measures:

• Pour 1 cup vinegar down drain monthly during cooling season
• Install drain line trap to prevent clogs
• Add algae tablets to drain pan quarterly
• Schedule annual drain line flush with maintenance
• Install condensate overflow shutoff switch
• Insulate drain line in attic to prevent condensation
• Replace air filter regularly to prevent coil freezing