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Carrier offers professional HVAC service, support, information, and resources for owners of our systems and products. Need a product guide or manual? You can always rely on your Carrier® dealer for solutions to any problems you may 20 Jul 2017NOTE: Read the entire instruction manual before starting the installation. . Refer to Electric Heater Function and Troubleshooting section of this manual. The needle valve on pin carrier is spring?loaded, which also exerts pressure on 14 Jun 2016 AND TROUBLESHOOTING. FK4B. The FK4B has an integrated control and motor (ECM/ECM/ICM) and special circuit board. Setting up desired airflow on the