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UNIT light not flashing green by itself

UNIT light not flashing green by itself — Interface not in default state for pairing

Mitsubishi Electric · Wi-Fi Interfaces

What does UNIT light not flashing green by itself mean?

Before initiating pairing, the green UNIT light should be flashing by itself, indicating the interface is in its default state. If it's not, the unit may still hold previous connection data or be in a different mode.

Common Causes

  • Interface retains old connection data.
  • Interface is stuck in an incorrect mode.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Push and hold the reset button for up to 15 seconds.

  2. 2

    Wait for the UNIT and MODE lights to temporarily turn on, then for the UNIT light to resume flashing alone.

  3. 3

    Ensure the interface is completely reset before attempting pairing again.

  4. 4

    Proceed with either WPS or Access Point mode pairing instructions.

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

Related Faults

App says 'unit was not found'App says 'unit was not found' — Wi-Fi Interface not communicating with home networkLED 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)
Source: Mitsubishi Electric Wi-Fi Interfaces
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