An air conditioner failing to kick on entirely can stem from several electrical or control issues. First, check your indoor thermostat to confirm it is set to "Cool" with batteries functioning properly. Second, inspect your main electrical breaker panel to see if the dual-pole HVAC breaker tripped. Third, a tripped float switch in your condensation drain pan will shut the system down to prevent water damage. Fourth, a burned-out contactor relay or a failed transformer inside the air handler can halt power. Verification: Listen for the unit to hum or check if the indoor blower motor engages.
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