An air conditioner compressor that shuts off almost immediately after starting up is typically experiencing a severe electrical or pressure-related safety shutdown. The most frequent cause is a failing run or start capacitor that cannot provide sufficient voltage to keep the motor spinning, leading to high current draw and thermal overload protection trips. Another common trigger is an incorrect refrigerant charge—either too low due to a leak or too high—which forces high or low-pressure switches to cut power instantly. Additionally, restricted airflow over dirty coils or a locked rotor condition can cause the compressor to overheat within seconds and shut down automatically.
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