Installing a Nest doorbell to replace a current doorbell

[Beamer]

I am trying to replace a current digital doorbell system that has a capacitor wired into the doorbell push button. I believe it is there to elongate the push period and allow more energy to get to the chime .. If I initiate a connection via the wires .. if there is a quick connect the chime is a short ring, but if connected for a second or more, you get the full chime version.

The doorbell light is blue but it is fading in and out not solid .... I have installed Nest doorbells before  but cannot get this one to work .. 

Any ideas would be greatly appreciated .. 

[tajennifer]

Hi Beamer,
 
Thanks for posting. I'm sorry to hear about the situation that you are experiencing while you are trying to install the Nest Doorbell. But don't worry; help is here. In this case, I just need to ask for some information to provide the best assistance:
 

• What Nest Doorbell are you trying to install?
• What model do you have before?

 
Please keep me posted. I'll be waiting for your response.
 
Best regards,
Jenny