All AC's and heat pumps are designed with a low refrigerant pressure sensor. If the refrigerant is low, the sensor will turn the compressor off to prevent compressor damage. If the compressor in your unit was running, it is probably NOT low on refrigerant. It is possible, not likely the sensor is defective and failed to shut the unit down. If the sensor is defective, the service tech should have been able to determine that and replace it.
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