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MAC-558/559 LED 1 once every 5 sec, LED 2 ON, LED 3 once every 5 sec

MAC-558/559 LED 1 flashes 5 sec, LED 2 solid ON, LED 3 flashes 5 sec — Server/AP/Heat Pump communication connected

Mitsubishi Electric · Wi-Fi Interfaces

What does MAC-558/559 LED 1 once every 5 sec, LED 2 ON, LED 3 once every 5 sec mean?

On MAC-558/559 models, LED 1 flashing slowly (every 5 seconds) with LED 2 solid ON and LED 3 flashing slowly (every 5 seconds) indicates that all communications are successfully established: server, access point, and Heat Pump.

Common Causes

  • Normal operation after successful connection and setup.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    No action is required as this indicates correct operation.

  2. 2

    You should now be able to control your Heat Pump via the Mitsubishi Electric Wi-Fi Control App.

  3. 3

    If you experience control issues despite this status, check app settings for conflicts or delays.

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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