How you know the drain is clogged
- The system stops cooling and will not restart, with the thermostat still showing a call.
- Standing water in the primary drain pan.
- Water dripping from the secondary pan or staining a ceiling below an attic unit.
- No water dripping from the outdoor drain stub during humid operation.
- A musty smell near the air handler or from the vents.
Why it happens so often here
A residential system in Tallahassee can pull gallons of moisture out of the air on a humid day. That water travels through a PVC line that stays warm and damp — ideal conditions for algae and biofilm.
Add dust that gets past a marginal filter and the slime binds into a plug, usually at a trap, an elbow or the termination.
What a provider does about it
- Locates the clog and clears the line with vacuum, nitrogen or mechanical methods depending on the layout.
- Flushes and treats the line, and checks the trap configuration.
- Inspects the primary and secondary pans for rust, cracks or improper slope.
- Tests the float switch to confirm it will actually shut the system down next time.
What a homeowner can safely check
These checks involve looking, not opening equipment or touching wiring. If anything you see involves water near electrical components, stop and request help.
- 1Look for visible water in or around the indoor unit and on the floor beneath it.
- 2Look for water staining on a ceiling below an attic air handler.
- 3Check whether water is dripping from the outdoor drain stub while the system runs on a humid day.
- 4Check the filter — a heavily loaded filter feeds the buildup that causes clogs.
- 5Note whether the system shut itself off and will not restart, which often means a float switch has done its job.
When to stop and request help
If water is actively leaking, pooling near the air handler, or anywhere near electrical components, turn the system off at the thermostat if it is safe to do so and request professional help.
Clearing a condensate line is straightforward for a provider with the right equipment, and it avoids the ceiling damage, coil corrosion and mold problems that come from letting a leak continue.
Preventing the next clog
Annual or twice-yearly drain service before and during cooling season is the practical answer. Keeping a clean filter reduces the dust that feeds the buildup.
If your system has already flooded once, ask whether the float switch is installed and working — that single component prevents most ceiling damage.
Need Help With This Today?
Call for 24/7 residential AC help in Tallahassee, or send a short description of what your system is doing.
Frequently Asked Questions
Yes. A float switch in the pan interrupts the cooling call when water backs up, so the system simply will not run until the line is cleared.