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MAC-558/559 LED 1 0.5 sec interval, LED 2 0.5 sec interval, LED 3 0.5 sec interval

MAC-558/559 LED 1, 2, and 3 flash at 0.5-sec intervals — Power ON or Software Download

Mitsubishi Electric · Wi-Fi Interfaces

What does MAC-558/559 LED 1 0.5 sec interval, LED 2 0.5 sec interval, LED 3 0.5 sec interval mean?

On MAC-558/559 models, if all three LEDs (LED 1, LED 2, and LED 3) flash rapidly at 0.5-second intervals, it indicates that the unit has just been powered on or that new software is being downloaded.

Common Causes

  • The Wi-Fi interface has just been powered on.
  • Firmware update or software download is in progress.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Wait for the LEDs to change to a stable operating pattern, typically LED 1 and LED 3 flashing in sequence every 5 seconds.

  2. 2

    Do not power off the unit during a software download.

  3. 3

    If the pattern persists, try resetting the interface to factory settings and re-pairing.

  4. 4

    Check the Mitsubishi Electric Wi-Fi Control App for any status updates or error messages.

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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