4. Check the condensate drain
If you own an air conditioner, it is vital to check the condensate drain pipe once in a while because, over time, the drain line will become clogged from dirt and debris, meaning one way or another, you will come home to water damage in your home when you least expect it.
To check the condensate drain pipe, first, you must identify the pipe that runs from the indoor to the outdoor unit, typically a white PVC pipe with an open end that allows water to drain. Next, you must find the access point, a T-shaped fitting with a cap on top.
Using a flashlight, you can inspect the drain line for any blockages or large pieces of debris. Remove any clogs by hand; if the drain is still clogged, mix a solution consisting of 1 cup of distilled white vinegar, bleach and hot water. Pouring this into the drain will break down existing blockages and kill mould or algae.
If flushing the condensate drain didn't work, you can use a Wet-Dry Hoover to try and clear the blockage. Place the hose over the open end of the drain line and seal the gap using a rag or tape. Let the Hoover run for a few minutes to allow the blockage to clear.