Why Is Water Leaking from My Indoor Air Handler?

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If you notice water leaking from your indoor air handler, it’s usually due to one of the following common issues:

1. The Unit Is Not Level

For proper drainage, the air handler must be installed level. If it's tilted, condensation may pool inside the unit and eventually leak out instead of draining properly.

2. Insufficient Clearance

The unit needs adequate clearance around it to ensure unrestricted airflow and proper drainage. If it's too close to walls, ceilings, or other objects, condensation may not be able to flow correctly through the drain system.

3. Improper Drain Line Slope

The condensation drain line must have a consistent downward slope. If it’s running uphill at any point, water can back up and leak from the unit.

4. Clogged Drain Line

Over time, dirt, mold, or algae can clog the drain line, preventing condensation from draining away. This will eventually cause water to overflow and leak from the air handler.

✅ Quick Fix Tips:

• Use a level to check the unit's installation.

• Ensure at least the recommended clearance (typically a few inches) on all sides.

• Check the drain line for proper slope and clear any blockages with a wet/dry vacuum or drain cleaner approved for HVAC use.

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Still have questions? Reach out to MRCOOL's support team or consult a licensed HVAC technician for help. Leaks are usually an easy fix—but catching them early prevents bigger problems down the line.

📞 (270) 366-0457
📧 support@mrcool.com
📝 Submit a support ticket