When an air conditioner blows exclusively hot air, it means the outdoor condensing unit and compressor are completely inactive, while only the indoor blower fan is running. This symptom usually indicates that the outdoor unit is receiving no electrical power due to a tripped breaker or blown fuse, the thermostat control wire is broken, a safety float switch has locked out the system because of a clogged drain line, or the outdoor compressor has failed entirely. Verification: Go outside to verify whether the outdoor condenser fan and compressor motor are spinning and humming.
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