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App says 'unit was not found'

App says 'unit was not found' — Wi-Fi Interface not communicating with home network

Mitsubishi Electric · Wi-Fi Interfaces

What does App says 'unit was not found' mean?

When trying to add a new unit in the app, receiving a 'unit was not found' message means the Wi-Fi interface has not successfully connected or is not communicating with your home Wi-Fi network.

Common Causes

  • Wi-Fi interface is not connected to the home network.
  • Incorrect MAC address or ID serial number entered.
  • Interface is not yet communicating with the Mitsubishi Electric Wi-Fi Control service.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    First, ensure the Wi-Fi interface is properly connected to your home Wi-Fi signal using the instructions on pages 7-9.

  2. 2

    Verify the NET light and UNIT light (or LED1 and LED3 for MAC-558/559) are flashing correctly after successful network connection.

  3. 3

    Double-check the MAC address and ID serial number entered in the app against the labels on the interface.

  4. 4

    Ensure your phone is on the same Wi-Fi network as the interface for automatic field population in the app.

Browse all codes in this manual (19)
Verified technical data. Last updated: April 2026

Related Faults

LED 1 flashingLED 1 flashing — WPS pairing in progress (MAC-558/559 models)MAC-558/559 LED 1 0.2 sec interval, LED 2 ON, LED 3 OFFMAC-558/559 LED 1 flashes 0.2 sec, LED 2 solid ON — WPS Activated (PIN)MAC-558/559 LED 1 0.5 sec interval, LED 2 0.5 sec interval, LED 3 0.5 sec intervalMAC-558/559 LED 1, 2, and 3 flash at 0.5-sec intervals — Power ON or Software Download
Source: Mitsubishi Electric Wi-Fi Interfaces
Open Manual (Page 36)Search more codes in this manual