Measure voltage across the safety string inputs (typically terminals 110V on plugs P1 and P2). If 110VAC is missing, the problem lies in the physical hoistway switches or pit switches, not the LCB II board.
Manuals use standardized codes to diagnose issues. Common fault codes found in verified guides include: otis lcb ii manual verified
The car failed to find the correction switch (7LS/8LS) during a terminal landing initialization run. Measure voltage across the safety string inputs (typically
The LCB II board integrates power supply support, input/output interfaces, and motor protection mechanisms directly onto the PCB. Common fault codes found in verified guides include:
Navigate to the "Inputs" screen. Verify that (Emergency Stop), DW (Hoistway Doors), and DFC (Gate Switch/Safety Chain) toggle correctly as you cycle the doors and the stop switch. Learning the Hoistway (M-1-3-1)
| Fault Code | Meaning | Manual-Specified Fix | |------------|---------|----------------------| | FL0201 | Door zone lost | Check door zone sensor (DZ) and magnets | | FL0304 | Car–controller serial loss | Inspect ribbon cable between LCB II and serial car link board | | FL050A | Overspeed during leveling | Check VVVF drive parameters (P240–P260) | | FL0802 | Brake pickup failure | Measure brake coil resistance (must be >80Ω) | | FL1100 | EEPROM checksum error | Perform parameter reset to factory (P00=1, then cycle power) |
: This 124-page guide is a primary resource for technicians, detailing URM (Service Tool) menu messages, system/tool menus, and event codes.