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

MAC-558/559 LED 2 solid ON, LED 3 flashes 5 sec — Access point comm failed, Heat Pump comm connected

Mitsubishi Electric · Wi-Fi Interfaces

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

On MAC-558/559 models, if LED 2 is solid ON and LED 3 flashes slowly (every 5 seconds) while LED 1 is off, it signifies that communication with the access point (your home Wi-Fi) has failed, but communication with the Heat Pump is still intact.

Common Causes

  • Loss of Wi-Fi signal from your home router.
  • Incorrect Wi-Fi network settings on the interface.
  • Router issues, such as being powered off or a change in Wi-Fi password.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check your home Wi-Fi router to ensure it is powered on and broadcasting a signal.

  2. 2

    Verify that the Wi-Fi password for your home network has not changed.

  3. 3

    Attempt to re-pair the Wi-Fi interface to your home network using either WPS or Access Point mode.

  4. 4

    Ensure the Wi-Fi interface is within range of your router.

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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