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A0

A0 - 2 red flashes, 5 green flashes — Duplicate address

Mitsubishi Electric · Air Conditioning

What does A0 mean?

This error means two or more Lossnay units have been assigned the same address, causing a conflict. Addresses need to be unique.

Common Causes

  • Two or more Lossnay units share the same address
  • Incorrect address configuration

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Identify the units with duplicate addresses.

  2. 2

    Change the addresses so each unit has a unique identifier.

  3. 3

    Reset the power to all affected units after correcting addresses.

Browse all codes in this manual (170)
Verified technical data. Last updated: April 2026

Related Faults

0.5-second ON / 0.5-second OFF blinkUpper lamp blinks 0.5-second ON/OFF - Miswiring or serial signal error00Normal operation - No error codes1 beep during error display mode1 beep during error display mode - Unit has an error (different code)
Source: Mitsubishi Electric Air Conditioning
Open Manual (Page 16)Search more codes in this manual