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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.

1500

AC DOWN

Mitsubishi Electric · MELSEC System Q/L Series

What does 1500 mean?

A momentary power supply interruption has occurred. This indicates a brief loss or sag in the incoming AC power supply, which can affect the stability and operation of the CPU.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the power supply.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

Related Faults

1000CPU Down Error1001CPU Down Error with Device Access Issue1002CPU Down Error
Source: Mitsubishi Electric MELSEC System Q/L Series
Open Manual (Page 1318)Search more codes in this manual