Doorbell 3 constant buzzing from wired doorbell unit inside the house

We just installed a new doorbell 3 and we noticed that we are getting constant buzzing from the inside the house wired doorbell chime unit. I also notice the doorbell 3 unit itself gets hot after connection. I disconnect the doorbell 3 unit and the buzzing goes away, connect back in buzzing continues. also, when you ring the door bell, you hear stronger buzzing from the unit. I re connect the old boring door bell and no buzzing and everything is smooth. by the way this is a new house construction, we just move in 4 month ago. everything is new. any help or advice is very much appreciated,