Identifying a clogged air conditioner condensate drain line involves checking for specific water backup warning signs. Major indicators include water pooling or leaking around the base of your indoor air handler or furnace, the emergency safety float switch tripping and shutting your entire cooling system down automatically to prevent flooding, a musty, stagnant odor coming from your supply vents, or standing water visible inside the clear PVC drain line or secondary drain pan. Verification: Pour a cup of water down the T-pipe access port to check if it drains freely or backs up immediately.
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