: This 124-page guide is a primary resource for technicians, detailing URM (Service Tool) menu messages, system/tool menus, and event codes.

The LCB II uses a handheld service tool (Otis Service Tool 2 or a compatible laptop with RS-232). The button sequence opens the main status menu. However, a verified manual provides the specific mapping of which data register corresponds to which fault code. For example:

Sets the lowest served floor (typically 00 ).

Before the LCB II controller can be powered on, a series of physical verifications is mandatory: