Mitsubishi Electric Error 405

Brand: Mitsubishi ElectricModel: PLC (FX5U / iQ-R / iQ-F Series)Error code: Error 405

What the Fault Means

Controller communication error

Likely causes

  • Handshake protocol failed; wrong baud rate on serial

Solution and Safe First Checks

  1. Match serial settings; check RS232/RS422 cable wiring

Safety: do not work inside the panel without isolating the power; if unsure, consult a qualified technician.

Related Mitsubishi Electric error codes

Source: the Zeror.ai industrial fault database and Mitsubishi Electric technical documentation. This page is for information; on critical systems follow the manufacturer's manual and authorised service.

Mitsubishi Electric Error 405 · Zeror.ai