An air conditioner located in an attic leaking water into your home is typically caused by one of several common failures. The primary culprit is a clogged condensate drain line blocked by algae, mold, slime, or dust accumulation, which prevents moisture from draining outside and causes the drain pan to overflow. Other common causes include a cracked plastic condensate drain pan, a disconnected drain pipe fitting, missing or damaged insulation around the suction line causing heavy condensation to drip, or a severely clogged indoor air filter freezing the evaporator coils into ice that eventually melts and overflows. Verification: Inspect the emergency secondary drain pan for standing water and check the primary PVC drain line outlet outside.
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