A leaking AC unit can be a nuisance and potentially lead to further damage. The most common causes of a leaking AC unit are clogged condensate drain lines, dirty air filters, low refrigerant levels, and a broken condensate pump. Addressing the leak promptly is crucial to prevent further damage and ensure the AC unit is functioning optimally.
The Steps You Need to Do After Detecting AC Unit Is Leaking Water
If you notice your AC unit is leaking water, here’s a step-by-step guide to troubleshoot and fix the issue.
1. Turn Off the AC Immediately
Shut off the thermostat and cut power at the circuit breaker to prevent electrical hazards or water damage.
2. Identify the Source of the Leak
Common causes include:
Clogged condensate drain line (most frequent)
Dirty air filter (restricts airflow, causing ice buildup that later melts)
Frozen evaporator coils (due to low refrigerant or poor airflow)
Damaged/disconnected drain pan (cracks or rust)
Improper unit leveling (prevents proper drainage)
3. Quick Fixes You Can Try
A. Unclog the Condensate Drain Line
Locate the PVC drain pipe near the indoor unit.
Use a wet/dry vacuum or pipe cleaner to clear algae/debris.
Pour 1 cup vinegar or bleach mixed with water to prevent future clogs.
B. Replace a Dirty Air Filter
A clogged filter restricts airflow, leading to frozen coils that leak when thawing.
Replace disposable filters every 1–3 months.
C. Thaw Frozen Evaporator Coils
Turn off the AC and let ice melt naturally (use a fan to speed it up).
Check for low refrigerant or blocked vents—if coils refreeze, call a pro.
D. Inspect the Drain Pan
If cracked or rusted, replace it (costs ~50–200).
Temporary patch for small cracks: waterproof epoxy sealant.
4. When to Call a Professional
Refrigerant leaks (hissing sounds, ice on coils, poor cooling).
Persistent leaks after DIY fixes.
Electrical issues (e.g., water near wiring).
5. Prevent Future Leaks
Schedule annual AC maintenance.
Keep the drain line clear with monthly vinegar flushes.
Ensure the unit is leveled correctly (slight tilt toward the drain).
Pro Tip: If water leaks near the furnace or electrical components, avoid DIY—call an HVAC technician immediately to avoid safety risks. Green Home Solution‘s air conditioner repair service is the best in Burnaby & Vancouver.
