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6600

6600 - Duplex address error (M-NET Remote controller only)

Mitsubishi Electric · PUMY Air Conditioners

What does 6600 mean?

A duplex address error has been detected, specifically when only an M-NET Remote controller is connected. This causes the air conditioning system to automatically stop operating.

Common Causes

  • Incorrect address settings for the M-NET remote controller.
  • A conflict or duplication in communication addresses on the M-NET bus.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Note the 6600 code displayed on your remote controller.

  2. 2

    Turn off the main power supply to the system at the circuit breaker.

  3. 3

    Verify the address settings for the M-NET remote controller, referring to your installation manual for correct configuration.

  4. 4

    Turn the main power supply back on.

  5. 5

    If the error persists, contact a qualified service technician to review the M-NET addressing.

Browse all codes in this manual (93)
Verified technical data. Last updated: April 2026

Related Faults

04030403 - Serial communication error11021102 — Compressor temperature trouble13001300 - Low pressure error
Source: Mitsubishi Electric PUMY Air Conditioners
Open Manual (Page 38)Search more codes in this manual