Emerson-Rittenhouse: Model C8203 Doorbell chime unit
I have replaced the intercom/doorbell unit with a simple door bell a few years ago and then the transformer about a year ago. When a delivery man rang my doorbell last week, the original unit on the wall in the house began to buzz/hum and felt warm to the touch. I had to detach the 3 screws in the unit to stop the noise and electrical flow. Since reconnecting and checking circuit breakers and wiring to the front doorbell, there still is no doorbell response and now no humming or sign of electrical flow. This is the original Rittenhouse wall unit since I bought the home in 1999 so is possibly out of use.