When an air conditioner suddenly stops cooling and begins blowing hot air, it is usually triggered by a protective safety device or a sudden electrical fault. Common reasons include a tripped circuit breaker due to an overloaded compressor motor, a safety float switch shutting down the system because of a clogged condensate drain line, a blown fuse in the outdoor disconnect box, or a thermal overload switch tripping inside the compressor after overheating on an extremely hot afternoon. Verification: Check your electrical panel for tripped breakers and examine your condensate drain line.
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