An air conditioner repeatedly freezing up usually points to persistent airflow restrictions or severe heat absorption failures. The most common culprit is a severely clogged, dirty air filter that chokes the volume of warm air passing across the indoor evaporator coils. Other frequent causes include blocked return air vents, dirty blower wheels, a failing indoor fan motor, or a low refrigerant charge caused by a hidden leak. When refrigerant levels drop or airflow drops, coil temperatures plunge below freezing, turning ambient moisture into solid ice. Verification: Inspect the new air filter and check that copper lines remain frost-free after running.
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