The Coleman 1084-900 Heat Pump Defrost Circuit Board SOURCE1 18390 is a replacement part designed for use in HVAC and refrigeration systems. Specifically manufactured by Coleman, this circuit board is compatible with the model 1084-900. It serves as a key component in regulating and controlling the heating and defrosting functions of the system, ensuring optimal performance and efficiency. Ideal for businesses or industrial facilities in need of a reliable and durable control board for their HVAC systems.