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Server/Unit Comm Startup

NET and UNIT LEDs flashing (variable) - Server and unit communication starting

Mitsubishi Electric · MSZ-AP Air Conditioners

What does Server/Unit Comm Startup mean?

The Wi-Fi interface is communicating with the server and starting up communication with the indoor unit. NET and UNIT LEDs will flash either every 0.5 seconds (searching for server) or every second (registering info to server).

Common Causes

  • Normal startup communication after power on or reboot.
  • Attempting to establish connection to the server or register information.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the Wi-Fi interface has a stable internet connection through your router.

  2. 2

    Wait for the communication process to stabilize and transition into normal operation.

  3. 3

    If this state persists for an extended period, try rebooting the Wi-Fi interface by holding the RESET button for 2 seconds.

Browse all codes in this manual (87)
Verified technical data. Last updated: April 2026

Related Faults

3 Min Restart DelayUnit cannot be operated for about 3 minutes after restart - Microprocessor protection3 Short Beeps3 short beeps from indoor unit - Weekly timer setting failedAP Mode activatedNET and MODE LEDs flashing (every 5 seconds) - Access Point Mode activated
Source: Mitsubishi Electric MSZ-AP Air Conditioners
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