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E11 / Red LED Keeps Flashing

E11 / Red LED Keeps Flashing - Indoor unit address setting error

Mitsubishi Heavy Industries · Air Conditioners

What does E11 / Red LED Keeps Flashing mean?

The remote control displays E11, and the indoor unit's red and green LEDs both keep flashing. This indicates an error in the address settings of the indoor units.

Common Causes

  • Incorrect or conflicting address settings for the indoor units

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to the installation manual for instructions on how to correctly set the addresses for each indoor unit.

  2. 2

    Turn off the main power to the unit, wait a few minutes, then restore power and try re-setting the addresses.

  3. 3

    If you are unsure how to adjust these settings, contact a qualified technician for assistance.

Browse all codes in this manual (110)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Heavy Industries Air Conditioners
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