If there is condensate in the overflow pan you probably have drain line clog.
Clean ac drain line in attic.
Then use duct tape to seal the gap between the hose and the drain line.
This will eat up the algae and free up the line.
Just pour a cup of bleach in the drain line s access opening near the indoor air conditioning unit.
Watch this video to find out more.
1 cup of vinegar.
If it is so far gone that it is really stubborn.
If you have an indoor air handler in your attic or utility closet you ll need to find the condensate pan.
Locate where the drain line exits your house and make sure it isn t clogged by an insect nest or something obvious.
One of the most efficient ways to clean your ac drain line is by flushing it with vinegar.
You will need these items to clean your a c condensate drain.
How to clean an ac drain line with vinegar in 5 steps.
Over time this drain can become clogged with dirt and debris and needs to be cleaned.
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Turn off your ac unit at the thermostat and at the breaker.
Turn off the power to your hvac system at the thermostat and at the breaker.
Fix the hose attachment to the wet dry vac s hose and position it into or flush with the end of the drain line.
Pour a gallon of water slowly into the overflow pan under the air handler and observe the water level in the pan to verify that water drains freely into the secondary drain line.
The exit point is usually but not always near the condenser unit.
If the condensate drain line is clogged you will need to use a wet dry vacuum or a special pump to unclog the line.
This will kill any algae mold or mildew that has formed in the pipe.
By pouring a cup of vinegar down your ac drain line you kill the algae mold and other bacteria that can build up and cause clogs.
Pour a mixture of hot water and bleach into the hole.
Clean out the drain pan as best you can.
It s possible that you may not have an outdoor exit point at all.
As they dehumidify they remove moisture from the air and drain it through a condensate drain.
If it is designed properly there will be a clean out hole that you can open to expose the drain.
Use the suction hose of a wet dry vac to suck the clog out.