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Firmware downloading

NET LED flashing (every second) - Firmware downloading

Mitsubishi Electric · MSZ-AP Air Conditioners

What does Firmware downloading mean?

The Wi-Fi interface is currently downloading new firmware. The green NET LED will flash every second, indicating the download is in progress.

Common Causes

  • Automatic firmware download initiated by the system.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Do not interrupt the power supply to the Wi-Fi interface or the indoor unit.

  2. 2

    Wait for the firmware download process to complete.

  3. 3

    Ensure your internet connection is stable and available to the Wi-Fi interface.

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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