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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

55

Board Fault

Kone · CMXC-022 Frequency Control Upgrade Kit

What does 55 mean?

A board fault has been detected in the R&M Materials Handling Frequency Converter, specifically indicating that the API3 board is either not installed or not functioning correctly. This could be due to power issues, incorrect wiring connections, or a faulty board component.

Common Causes

  • API3 board not installed
  • API3 board not working properly

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Switch off the supply voltage to the frequency converter

  2. 2

    Check the supply voltage to the API3 board

  3. 3

    Verify all wiring connections to the API3 board

  4. 4

    If the problem recurs, replace the inverter

Browse all codes in this manual (40)
Verified technical data. Last updated: April 2026

Related Faults

1Overcurrent13Under temperature14Overtemperature
Source: Kone CMXC-022 Frequency Control Upgrade Kit
Open Manual (Page 52)Search more codes in this manual