Hi @hehepablo ,   Welcome to the community!   Thansk for raising this to us, normally the red light indicates a potential line fault affecting the service or possibly the installation is not yet completed. To better understand the situation, drop me a private message with your account details (Username/Customer ID together with the address on file) together with the address on file.   How do I private message (PM) in the community    Regards,   @hehepablo wrote: Hello I have received my nbn box and modem. I have followed installation. Even checked this forum. My nbn box has a red light on the link chain flashing and a clicking noise. Is there anything I can do to fix this.   ... View more