Ask Absolute · Maintenance

Why does my HVAC drain keep clogging?

Direct answer

Condensate drains can clog from biological growth, dust, installation slope, damaged piping or a poorly draining termination.

What this usually means

Repeated clogs deserve more than clearing the same spot. The line route, trap, venting, slope, pan and equipment cleanliness may need evaluation.

Water safety switches should be tested and kept functional, particularly when equipment is located above finished space.

What you can safely check

  • Visible water or pan staining
  • Drain termination condition
  • Whether a safety switch stopped cooling
  • How soon the clog returns
When to call a professional

Request service for recurring drainage trouble, ceiling risk, overflowing pans or a system that will not restart after water is removed.

Related next stepCooling maintenanceExplore this topic

Ready for better comfort?

Tell us what is happening. We'll help you make the right call.