The most frequent and common issue causing a residential air conditioner to stop working is a severely dirty, clogged air filter. When an air filter becomes choked with dust and pet hair, it severely restricts airflow across the indoor evaporator coils, causing them to freeze into a solid block of ice. Other extremely common issues include a tripped circuit breaker, a blown fuse in the outdoor disconnect box, a full condensate drain pan tripping a safety float switch, or a failed outdoor capacitor. Verification: Inspect your indoor air filter and check your electrical panel for tripped breakers.
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