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LED every 0.5 sec

ERR/NET LED flashes every 0.5 sec — Invalid IP address setting

Mitsubishi Electric · MSZ-AP Air Conditioners

What does LED every 0.5 sec mean?

The ERR or NET LED on the Wi-Fi interface is rapidly flashing (every 0.5 seconds), indicating a problem with the IP address configuration.

Common Causes

  • Invalid IP address settings on the Wi-Fi interface
  • Incorrect DHCP settings on the Router
  • IP address conflict on the network

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the DHCP settings of your Router and ensure they are correctly configured to assign IP addresses.

  2. 2

    Verify the IP address settings of the Wi-Fi interface to ensure they are valid for your network.

  3. 3

    If settings appear correct, push the RESET Button on the Wi-Fi interface for more than 15 seconds to retry pairing.

  4. 4

    Restart your Router and then 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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