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7102

7102 - Error in number of connected units

Mitsubishi Electric · Air Conditioning

What does 7102 mean?

This fault occurs if there's an error in the number of connected units, often due to loss of M-Net voltage, power issues, or incorrect outdoor box settings.

Common Causes

  • Loss of M-Net voltage (short or break)
  • No power to the BC (Branch Controller)
  • Incorrect SW5 setting on the outdoor box
  • Wrong outdoor box type installed

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the M-Net wiring for shorts or breaks.

  2. 2

    Ensure the BC unit is receiving power.

  3. 3

    Verify the SW5 setting on the outdoor unit.

  4. 4

    Confirm the correct type of outdoor box is used.

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 14)Search more codes in this manual