When an air conditioner refuses to stay on, it is usually experiencing short cycling or a safety shutdown triggered by a protective mechanism. Common causes include a severely clogged air filter that restricts airflow and causes evaporator coils to freeze, low refrigerant levels from a leak that trips pressure switches, a failing run capacitor that overheats the compressor motor, or a blocked condensate drain line triggering a safety float switch. Additionally, electrical problems like loose wiring, a faulty thermostat, or an overheating compressor can force the system to cut power repeatedly.
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