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MAC-558/559 LED 1 OFF, LED 2 ON, LED 3 OFF

MAC-558/559 LED 2 solid ON — Access point comm failed, Heat Pump comm starting up

Mitsubishi Electric · Wi-Fi Interfaces

What does MAC-558/559 LED 1 OFF, LED 2 ON, LED 3 OFF mean?

On MAC-558/559 models, if only LED 2 is solid ON and LED 1 and LED 3 are off, it indicates that communication with the access point (home Wi-Fi) has failed, and communication with the Heat Pump is currently in its startup phase.

Common Causes

  • No connection to the home Wi-Fi network.
  • The Heat Pump is initializing communication with the interface.
  • Temporary network disruption.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check your home Wi-Fi router to ensure it is powered on and functioning.

  2. 2

    Restart the Wi-Fi interface and allow time for it to attempt to connect.

  3. 3

    Attempt to re-pair the Wi-Fi interface to your home network.

  4. 4

    Ensure the Heat Pump unit is fully powered and ready.

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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