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I'm replacing a doorbell chime unit. The old one worked, but the new one does not. If I connect the wire to the terminal labeled "front", it will ding. If I connect the wire to the terminal labeled "rear", it dongs. The latter makes sense as that should be so a rear or side doorbell has a different sound. But why doesn't it ding-dong when connected to "front"? The hammer moves freely up and down (no wire in the way blocking it).

The transformer measures only 11 volts. That seems low, should I replace it? If not, what else could be the problem?

Old:

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New:

enter image description here

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  • Are you sure you haven't reversed the two red wires?
    – Phil Freedenberg
    Jan 5 '19 at 19:09
  • @PhilFreedenberg, I just tried swapping the red wires - same result.
    – MissingMyDangDingDong
    Jan 5 '19 at 19:38
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It was the transformer. I replaced it and the doorbell now works as expected. Upon closer inspection the old transformer was only a 10V model where I needed a 16V one.

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  • Thanks for posting your answer. A few more details could really help a future visitor.
    – Daniel Griscom
    Jan 5 '19 at 23:05

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