Why Is My Mini Split Leaking Water?

Modified on Wed, 2 Apr at 1:13 PM

Overview

If you notice water leaking from your Senville mini split air conditioner, don’t panic — it's one of the more common issues and usually easy to troubleshoot. This article covers the most likely causes and what you can do to resolve or prevent them.

Common Causes of Water Leaks

1. Clogged or Dirty Drain Line

Over time, the condensate (drain) line can become clogged with dirt, algae, or debris. This prevents water from draining properly and causes it to overflow inside the unit.

What to check: Look near the outdoor drain line for water dripping slowly or backing up.
What to do: Use a wet/dry vacuum at the outdoor drain line to clear the blockage, or contact a professional for a full line flush.

2. Improper Installation (Tilted Unit)

If the indoor unit was installed without the correct downward tilt toward the drain pan outlet, water may not drain properly.

What to check: Look at the indoor unit — is it tilted forward or flat?
What to do: This usually requires an installer to re-level or re-mount the unit correctly.

3. Frozen Evaporator Coil

A frozen coil will eventually thaw and release excess water, which can overwhelm the drain pan.

Causes: Low refrigerant, poor airflow, or dirty filters.
What to do: Turn off the unit to let it thaw, clean or replace the air filters, and call a technician to check refrigerant levels.

4. Cracked or Disconnected Drain Pan or Hose

If the drain pan is damaged or the hose is disconnected, water will leak directly from the unit.

What to check: Look under the indoor unit for cracks or loose fittings.
What to do: This usually requires disassembly and repair by a qualified HVAC technician.

5. High Humidity or Extended Use

During extended cooling in hot, humid weather, more condensation is produced, which can temporarily overwhelm drainage if the line is partially blocked.

What to do: Monitor the system. If the leak stops when humidity drops, it may not be a serious issue — but drain line cleaning is still recommended.

Preventing Future Leaks

Clean your air filters every 30–60 days.
Schedule annual maintenance for your mini split system.
Keep the drain line clear and check it regularly during high-usage seasons.

Need Help?

If you're unable to locate the cause or fix the leak, please submit a support ticket or contact our technical support team. We’re happy to help you get your Senville system running smoothly again.