There can be several reasons why your AC outdoor unit stops working after approximately 30 minutes. Some possible causes include:
Overheating: The outdoor unit may be overheating due to issues such as a dirty condenser coil, restricted airflow, or a malfunctioning fan motor. When the unit reaches a certain temperature, it may automatically shut off to protect itself from further damage.
Refrigerant Issues: Low refrigerant levels or a refrigerant leak can cause the AC system to malfunction. If the refrigerant charge is insufficient, the system may struggle to cool properly and eventually shut down.
Electrical Problems: Faulty wiring, loose connections, or electrical component failures can interrupt the power supply to the outdoor unit, leading to its shutdown. This can be a safety feature to prevent damage or electrical hazards.
Thermostat Issues: A malfunctioning thermostat can incorrectly sense the temperature, leading to improper cooling cycles. If the thermostat is not accurately controlling the cooling process, it may cause the outdoor unit to shut off prematurely.
Compressor Problems: Issues with the compressor, such as motor overheating, electrical failures, or mechanical faults, can cause the outdoor unit to stop working. The compressor is a critical component responsible for pressurizing the refrigerant, and if it malfunctions, it can trigger a shutdown.
System Sizing: If the air conditioning system is improperly sized for the space it is cooling, it may cycle on and off too frequently, causing strain on the outdoor unit and potentially leading to shutdowns.
It is advisable to contact a professional HVAC technician to diagnose and address the specific issue with your AC system. They have the expertise to inspect the equipment, identify the root cause of the problem, and perform any necessary repairs or adjustments to restore proper functionality.