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A1

A1 — Duplex address error (M-NET Remote controller only)

Mitsubishi Electric · MXZ Air Conditioners

What does A1 mean?

This error occurs when using an M-NET remote controller and indicates a conflict or issue with the duplex address settings. This prevents proper communication within the M-NET system.

Common Causes

  • Incorrect address settings for devices on the M-NET network.
  • Duplicate addresses assigned to multiple devices.
  • Wiring issue with the M-NET communication system.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the address settings for all units connected to the M-NET remote controller network.

  2. 2

    Ensure that no two devices have been assigned the same duplex address; each must be unique.

  3. 3

    Check the M-NET communication wiring for proper connection, polarity, and overall integrity.

  4. 4

    Consult the M-NET remote controller's specific installation manual for detailed addressing procedures and troubleshooting steps.

  5. 5

    Power cycle the entire M-NET system after making any address changes.

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

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Source: Mitsubishi Electric MXZ Air Conditioners
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