I added the Diode to the Doorbell2. Doorbell2 works fine without any issues. I connected the Doorbell2 to my existing M&S Intercom wires. Now, my Intercom is constantly chiming as though someone is pressing the button constantly. When I press the button, the doorbell2 works fine with no issues, however, I have this constant chime in my house from the M&S Intercom. What am I doing wrong?