We performed a comprehensive diagnostic and maintenance service on a residential Generac standby generator in Montgomery. Our team inspected the unit's internal components, including the ignition coil assembly and electrical connections, to address a specific error code displayed on the control panel. We also verified the electrical service installation and main breaker connections to ensure seamless power transfer. The service included replacing the oil filter and testing the lead-acid battery to confirm optimal starting power. We documented the system hours and maintenance dates on the Generac components to track future service intervals. These proactive steps ensure the backup power system remains reliable and ready for the next utility outage.