When your air conditioner begins blowing warm air, follow a structured troubleshooting process. Step 1: Check your indoor thermostat to ensure it is set to "Cool" and the target temperature is lower than the room. Step 2: Inspect your indoor air filter; a severely clogged filter restricts airflow and freezes coils. Step 3: Check your outdoor condenser unit to ensure airflow is not blocked by debris and the fan is spinning. Step 4: Turn the system off to prevent compressor damage. Verification: Hold your hand up to supply vents to check if chilled airflow returns after resolving issues.
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