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ERR Flashing NET ON (Router Fail, Indoor OK)

ERR Orange Flashing, NET Green ON — Router connection failed, but connected to indoor unit

Mitsubishi Electric · MSZ-AP Air Conditioners

What does ERR Flashing NET ON (Router Fail, Indoor OK) mean?

The Wi-Fi interface failed to connect to your local Router, but it successfully established a connection with the indoor air conditioner unit. This indicates a network issue at the Router level.

Common Causes

  • Router signal strength issues or distance too far
  • Router DHCP or DNS settings are invalid
  • Incorrect Wi-Fi password or security settings
  • 2.4GHz Wi-Fi band not enabled on a dual-band Router

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the distance between the Wi-Fi interface and your Router; move them closer if possible.

  2. 2

    Verify your Router's Wi-Fi network is operating correctly and other devices can connect.

  3. 3

    Check the Router settings to ensure DHCP is enabled or that DNS settings are valid.

  4. 4

    Push the RESET Button on the Wi-Fi interface for more than 15 seconds to retry the pairing process.

  5. 5

    If the issue continues, contact your local Mitsubishi Electric office.

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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