Getting a non-functioning residential air conditioning system to start working again requires following a structured troubleshooting sequence to identify the root cause. First, check your indoor wall thermostat to ensure it is set to cooling mode and that the temperature setpoint is lower than the room temperature. Second, go to your home's main electrical panel and verify that neither the indoor air handler breaker nor the outdoor condenser breaker has tripped, resetting them if necessary. Third, turn off power and check the indoor furnace control board for a blown low-voltage fuse. Fourth, inspect your air filter and condensate drain line to ensure safety switches are not tripped. You can verify that your troubleshooting was successful when power is restored and the AC successfully cycles on, blowing crisp, chilled air from your supply vents.
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