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Why is Water On the Floor Next to My Heating or Cooling Unit?

No matter the size of the leak, it's important to address the problem to prevent damage to the unit and your home. Here's how to figure out what that pool next to your heating or cooling unit really means and what to do if your furnace is leaking water.

Why Is My HVAC Leaking Water?

That puddle next to your AC or furnace may be a cry for help. Let’s investigate your system’s puddle problem so we can get back to a healthy unit!

Potential Issues

  • water leaking from heating or cooling system
  • air conditioner won’t turn on
  • heating unit won't turn on

The condensate pump on your HVAC unit is used to pump out the water (condensate) that the unit produces during the heating and cooling process. In order to work properly, the condensate pump must be plugged in. If it is not, the HVAC unit won't function properly. If the condensate pump was not wired correctly into the safety circuits, the HVAC unit will continue to produce condensate and can cause water damage.


  • water leaking from heating or cooling system

In the heating and cooling process, water droplets form at the evaporator coil and collect in a tube. The tube passes runoff water to the drain pan. The pan is equipped with a safety device called the pan float switch, which comes on when the pan is full. This will turn off your HVAC unit to prevent water from leaking on the floor. If the pan is full, there may be an issue with water coming from a frozen coil or a clog in the drain.


Let's Get It Fixed!

HomeX virtual experts will assess your issue (for free!) and can resolve simple problems.

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