When your air conditioner fails to turn on, follow a systematic troubleshooting process. Step 1: Check your indoor thermostat to ensure it has fresh batteries, is set to "Cool," and calls for a temperature lower than the room. Step 2: Inspect your main electrical panel to see if the HVAC breaker has tripped, and reset it if necessary. Step 3: Check the condensate drain pan near your indoor air handler to ensure a full float switch hasn't shut the system down. Step 4: Inspect the outdoor disconnect box. Verification: Listen for the system to hum and verify that the blower motor starts spinning.
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