Here’s a comprehensive guide to — what they are, how to access them, common codes, and troubleshooting steps. 1. Understanding Schindler 5500 Error Codes The Schindler 5500 is a modern, microprocessor-controlled elevator system. Error codes are logged by the LMS (Lift Management System) controller to help technicians diagnose faults. These codes are essential for maintenance, reducing downtime, and ensuring safety.