The Viessmann 7839612 Ignition Module B2XX/CU3A is an essential electronic component designed to control burner ignition in compatible gas-fired heating boilers. It generates the electrical spark required to ignite the gas and initiate the heating cycle. This module is used in Viessmann Vitodens 200-W, Vitodens 222-F, and Vitocrossal 300 series boilers. It helps ensure reliable startu... https://www.partshnc.com/7839612-viessmann-ignition-module-b2xx-cu3a