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Furnace Leaking Water

Water around a high-efficiency furnace usually comes from a clogged condensate drain or failed condensate pump. Clearing the drain is often DIY; pump replacement runs $150–$450.

Reviewed July 2026

What does furnace leaking water mean?

Condensing furnaces produce water as a byproduct of combustion. That water drains through a hose and trap, or a condensate pump on some installs. A clog or full pump triggers leaks and can lock out the furnace for safety.

What usually causes furnace leaking water?

Clogged condensate drain linemost common

Typical repair: $150–$450

Failed condensate pumpcommon

Typical repair: $150–$450

Cracked condensate trappossible

Typical repair: $150–$450

Find your exact error code

Select your furnace brand to jump to the code page for this symptom.

Rheem61Blower failed to runRuud61Blower failed to runDaikin3 FlashPressure-switch circuit did not closeLuxaire12 BlinksIgniter circuit fault

What should I check first when furnace leaking water?

  1. Turn off the furnace and soak up standing water.
  2. Inspect the condensate drain hose for kinks or clogs.
  3. Pour a cup of water into the drain pan to test the pump if equipped.
  4. Call a pro if water returns after clearing the line.

What a repair costs

A condensate pump replacement typically costs between $150 and $450 nationally.

Typical repair cost
$150 – $450condensate pump replacement
Where the money goes
Part $50–$150Labor $0–$400Typical labor time: 0.5–1 hrs

This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.