How to Fix Logitech MX Master 3 Mouse Easy-Switch Light Blinking Rapidly But Not Connecting

Quick Diagnosis

A rapidly flashing Easy-Switch indicator light shows that the mouse is broadcasting a Bluetooth beacon but the target device is rejecting the connection handshake due to a stale pairing key. Manually resetting the channel on the mouse's bottom panel clears the old key and forces a clean connection.

Technical diagnostic blueprint diagram for the Logitech MX Master 3 Mouse showing symptoms of Easy-Switch Light Blinking Rapidly But Not Connecting.

Step-by-Step Resolution

  1. 1

    Turn off the mouse using the power switch on the bottom, wait 5 seconds, and switch it back on.

  2. 2

    Press the Easy-Switch button on the bottom plate to select the desired channel slot (1, 2, or 3).

  3. 3

    Press and hold the Easy-Switch button down for exactly 3 seconds to clear the selected channel's connection register.

  4. 4

    Release the button once the channel light begins to flash rapidly, confirming pairing mode is active.

  5. 5

    Select 'MX Master 3' from the Bluetooth settings menu on your host device while the light is flashing to complete the pairing.

Alternative Causes & Edge Cases

  • Applies to Logitech MX Master 3S and Logitech MX Anywhere 3 models.
  • Radio frequency interference from nearby USB 3.0 ports can block the 2.4GHz receiver signal, mimicking a pairing failure.