I have a Heath-Zenith SL-2796 doorbell. It's wired to a front and rear door buttons. Pressing the front door button should make it go "ding-dong" and pressing the rear door button should make it go "dong".
A few months after it was installed, it began to fail. Now, one of the chimes never sounds.
- When the front door button is pressed, it does "clunk-dong". When I hold down the front door button, it goes "clunk-buzz" and then goes "dong" when I release the button. The buzz sounds electrical.
- When the rear door button is pressed, it still causes a "ding", as expected, i.e. the same tone as the first part of the front door sound.
- So, the "ding" works for the rear door, while only the "dong" works for the front door.
The voltage of the doorbell circuit is 19V.
I asked my wife to watch the movement of the plungers when I pressed the front door button. She said that one of the plungers never moves.
Is this caused by a problem in the wiring of the house, or something inside the doorbell chime module? Should I just replace the doorbell chime module?