Key Takeaways AC Running Constantly Thermostat Settings Air Filters Electrical Components Air Conditioner Not Turning On Check Circuit Breaker Verify Thermostat Settings Secure Wiring Connections No Cool Air Flowing Blower Belt Refrigerant Levels Hot Air Blowing Out Dirty Air Filters Refrigerant Leaks Refrigerant or Water Leaks Detecting Leaks Preventive Measures