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Ride Along: Water Under the Floors in a Nearly New Nocatee Home

Water Was Coming Up Under the Hallway Flooring

In a Nocatee home only a few years old, the homeowner discovered water emerging from beneath her luxury vinyl plank hallway flooring. The source was the air conditioning closet: condensate had entered and saturated the ductboard return box beneath the air handler, then reached the closet floor and traveled under the flooring.

A Previous Drain Cleaning Hadn’t Solved It

The homeowner told us a previous technician had vacuumed the drain from the outside and replaced the primary float switch. But water continued to appear. The problem was that water was overflowing inside the drain pan area and entering the return ductwork without reaching the existing switch.

Over the following days, the homeowner noticed a musty odor. She used fans and a dehumidifier near the wet return box and limited air conditioning use mostly to nighttime, but still found water each day.

What We Found

The ductboard return box was saturated, and the condensate line was still draining very slowly. A line can pass some water and still be restricted enough to cause overflow. We also needed to improve the system’s protection against future condensate overflow.

Our Corrections

  • Removed and replaced the saturated ductboard return box.
  • Cleared the remaining condensate drain restriction using a CO₂ drain-clearing gun.
  • Tested the drain after clearing it by pouring enough water through the line to verify proper drainage, continuing until the discharge ran clear.
  • Added a secondary condensate safety switch.
  • Installed an auxiliary drain pan with its own safety switch.
  • Added an external filter rack to make filter replacement easier than with the original Carrier under-unit arrangement.

Why You Have to Test a Drain After Clearing It

Using a shop vacuum or drain-clearing tool is not the same as proving the drain works. A partially blocked line may still move water, just not fast enough. After clearing a restriction, we run water through the drain and verify it flows freely. In this case, we continued flushing and testing until the discharge ran clear.

A float switch also has to be positioned where rising water can actually activate it. Replacing a switch alone will not prevent water from escaping along a different path.

The Outcome

We completed the duct replacement, drain correction, and additional overflow protection. The homeowner is monitoring the system over the weekend, and we’ll return if any water reappears. We believe we’ve addressed the HVAC-related causes, but we’re not claiming a permanent resolution before the system has been observed in normal operation.

Seeing Water Near Your AC Closet?

If your air handler is leaking, your return box is wet, or water is appearing beneath nearby flooring, the cause deserves a proper HVAC diagnosis—even in a newer home. Klein Cooling serves Nocatee, St. Augustine, World Golf Village, Palm Coast, and surrounding communities. Contact Klein Cooling for help.

Comfort. Integrity. Legacy.