Today, I completed a repair on a Carrier Infinity Series air conditioning unit that was not cooling effectively due to a faulty compressor contactor. I replaced the defective contactor and also seized the opportunity to clean the external condenser coil using a high-grade coil cleaner. Following the repair, I conducted a thorough system evaluation and performance test to ensure it was delivering proper cooling and airflow. The homeowner's air conditioning system is now functioning at its highest efficiency.