An air conditioner that shuts off after only thirty seconds is experiencing an immediate safety or electrical cutoff, meaning the system attempts to start up but encounters an abnormal condition that forces a protective shutdown. A frequent cause is a severely failing run capacitor that cannot maintain the electrical voltage required by the compressor or fan motor, leading to an instant current spike and overload trip. Another common trigger is a tripped high or low-pressure switch, which activates when refrigerant pressures are dangerously out of balance due to a major blockage or leak. Additionally, a severe electrical short circuit, loose wiring terminal connections, or a locked rotor condition inside the compressor can cause the unit to trip its internal breaker or thermal overload protector almost instantly upon startup.
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