A blocked or severely restricted air conditioner condensate trap presents several distinct symptoms that indicate water is failing to drain away from your indoor air handler properly. One of the most immediate signs is standing water accumulating in the primary drain pan located directly beneath or inside the evaporator coil housing. In many modern HVAC installations, this rising water level triggers a safety float switch, which cuts power to the entire system and causes your air conditioning unit to stop blowing cold air entirely despite the thermostat calling for cooling. You might also notice musty, damp, or unpleasant mold odors emanating from your ductwork and vents, which occur when stagnant water sits inside the blocked trap and breeds bacteria, algae, and mildew. Additionally, if the trap overflows completely and bypasses secondary safety pans, you will see water leaking onto ceilings, floors, or drywall around the indoor unit, signaling an urgent drainage failure that requires immediate attention.
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