This allows technicians and homeowners to readily identify issues with a blower or other components when installing the replacement module. Different continuous and flashing light indications can provide information on external and internal operations. The surface of the unit features an ordered guide on what these different sequences mean. This helps to identify component shorts or other wiring issues that need to be addressed and corrected. The diagnostic system also works to protect technicians and homeowners by providing a warning mechanism. This mechanism can alert users to electrical malfunctions that necessitate turning off the gas supply of a furnace. In addition, the fuse arrangement is designed to safeguard low-voltage system transformers. The fuse switch assists in ensuring that motors are protected from low-voltage faults and short-circuiting. This White-Rodgers Ignition Control unit also comes with a part cross-reference chart. Users can check whether the 50A55-843 replaces a previous model on a particular furnace or air conditioner. It is compatible with a variety of systems made by manufacturers like Trane and Honeywell. Furthermore, the factory replacement module has an array of customizable features. These include adjustments to the inducer blower motor relay and a DIP switch for delays in on-and-off sequences. Connections are easily labeled for hassle-free switching by technicians. Securing the unit to a furnace is also made easy by the provided mounting hole template.