When we push the button for doorbell there's a click but chimes won't ring. We've got electricity at lighted doorbells and inside at chimes

Do you have a diagram of a nu tone doorbell for three doors not sure where exactly spring and plungers are located

do you have a diagram of a nu tone doorbell for three doors not sure where exactly spring and plungers are located

If it is a spring and plunger type, they are under the wall box cover. Remove it and you will see them. Make sure they can slide back and forth or put a little WD40 on then. If it is an electric digital type, there are no plungers.