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ERR Flashing NET Flashing (Router Fail, Indoor Connect)

ERR Orange Flashing, NET Green Flashing — Router connection failed, attempting indoor unit connection

Mitsubishi Electric · MSZ-AP Air Conditioners

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

The Wi-Fi interface is trying to establish a connection with the indoor unit while also failing to connect to your home Router, indicating a dual communication problem.

Common Causes

  • Wi-Fi interface unable to connect to the Router
  • Poor Wi-Fi signal or interference
  • Indoor unit communication still initializing while Router connection fails

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check your Router's status and ensure it is powered on and broadcasting a 2.4GHz Wi-Fi signal.

  2. 2

    Verify the distance and any obstructions between the Wi-Fi interface and the Router.

  3. 3

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

  4. 4

    Consult your Router's manual or ISP for Router troubleshooting if necessary.

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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