The Bosch HVAC 8733802694 EON ECM Board Kit is an electronic control board designed to manage constant-airflow ECM blower motor operation in Bosch heat pump systems. It communicates with the ECM motor to regulate blower speed and maintain consistent airflow according to system demands. This board is used with Bosch SM-series heat pumps, including SM024-1VTC, SM036-1VTN, SM048-1HZC, SM... https://www.partshnc.com/bosch-hvac-8733802694-eon-ecm-board-kit