Features: Widely Used:The 50A55-843 is a universals replacement for all 50A50 and 50A55 models. such as 50A50-131 50A50-230 50A50-231 50A50 - 241 50A50-405 50A50-471 50A50-472 50A50-473 50A55-571. Accurately control the timing management of the entire combustion process, continuously monitor the flame condition and systems temperature, quickly identify ignitions failure, flame abnormality, sensors failure, and immediately triggering the automatic locking protections mechanism. Built with electronic components to withstand heat, vibrations and electrical stress, extending furnaces service life. Built-in advanced microprocessor technology enables precise ignitions timing, flame detection, blower control and safety monitoring. Integrated LED fault indicators light allows for quick troubleshooting. Easy Installation: Includes clearly labeled terminals and wiring guides for quick, straightforward installation. Specifications: Component: Plastic Size: about 20x14cm/7.87x5.51inch Package Includes: 1pc furnaces Control Board note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.