To stop your central air conditioning system from blowing warm air, follow a direct troubleshooting sequence. Step 1: Turn your indoor thermostat to the "Off" position to prevent further strain on the compressor. Step 2: Inspect your indoor air filter; a choked filter blocks airflow and freezes evaporator coils into ice. Step 3: Go outside to verify whether your outdoor condensing unit fan and compressor are spinning and humming. Step 4: Reset your electrical breakers if power was interrupted. Verification: Turn the system back on after 15 minutes and check that chilled air begins flowing from supply vents.
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