Colour coding: 

Blinking blue: Extender is searching the analyzer.

Blinking green: Connection attempt of the Extender to the Wi-Fi. It tries to send a measurement via Wi-Fi.

Static green: Extender is connected to the Wi-fi. The measurement has been sent.

If red after green: Connection error via the Wi-Fi network. Check the distance between the Extender and the router. Verify the signal quality and check to have introduced the correct password.

If red after blue: Connection error to the analyzer via Bluetooth. Check the distance between the Extender and the analyzer.