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ErrorLib — Industrial Fault Code Library

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CPU_FROM_CRC_CHECK_ALARM

CPU FROM CRC Check Alarm

Fanuc · Alpha i series AC Servo Motor

What does CPU_FROM_CRC_CHECK_ALARM mean?

A CRC (Cyclic Redundancy Check) alarm for the FROM (Flash Read-Only Memory) built into the CPU is issued. This indicates potential corruption or integrity issues with the firmware stored in the CPU's memory, affecting core functionality.

Common Causes

  • Corruption or integrity error in the CPU's internal FROM (firmware)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn the power off, then back on

  2. 2

    If this alarm recurs, replace the servo amplifier module

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

000Power-Down Required Parameter011Zero Feedrate Specified013Maximum Feedrate Zero
Source: Fanuc Alpha i series AC Servo Motor
Open Manual (Page 231)Search more codes in this manual