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Old 10-01-2011, 09:57 AM   #1
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Weirdness in the Doorbell


I replace a 3 wire in the wall (damaged from a flood) to the door chime box - wired it correctly and ran the wire back to where it was spliced (j box) - i hooked it up to a 2nd LV Transformer as the one attached to the panel was ghetto and old.

Stupid me never check the voltage of the 2nd LV Transformer (output 24v) where the original/ghetto was giving (18v). When hooked up I got a 2-tone chime at the front door (just as I was getting) and nothing at the back door (should be a 1 tone chime)

So I rewire the 2nd LV Transformer with a new 16v LV Transformer and I get 21V! I get a 2-tone chime at the front and back doors. WTF???

Any suggestions, feel free to ask questions if I left something out.

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Old 10-01-2011, 10:11 AM   #2
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Weirdness in the Doorbell


Your chime should have three connections. A common which goes to the transformer, a front door which would come from the front door switch, and a back door which comes from the back door switch.

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Old 10-01-2011, 10:20 AM   #3
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Weirdness in the Doorbell


If the wires for the doorbell circuit are lengthy and of small gauge there could be enough voltage drop that the chime unit does not function. A higher voltage transformer might overcome that.

The "no load" voltage of a transformer can be somewhat over the rated voltage. This can cause unexpected problems such as lights (small load) burning out including the light in a doorbell button (even if there is large load voltage drop sufficient to prevent sounding the chime), and including lights in model train scenery (if there is no locomotive running to load down the transformer).

Cheaper chime units may sound just one chime for both front and back doors on insufficient voltage or may sound both chimes for both front and back doors on excessive voltage. The back door plunger and solenoid should have a stop to prevent hitting the second chime, not relying only on spring tension.
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Last edited by AllanJ; 10-01-2011 at 10:29 AM.
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Old 10-01-2011, 10:36 AM   #4
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Weirdness in the Doorbell


Ok I think I got all of you confused. Lets try again.


FD=front door
BD=back door

Original 18v transformer (old) everything worked - 2 tone FD -- 1 tone BD
2nd 24v existing transformer - 2 tone FD - no tone BD
New 16V transformer putting out 21V - 2 tone FD -- 2 tone BD

1) why is the new transformer putting out more volts. Package read 16v 10vac

2) Why now is the BD - 2 tone?

Any questions - feel free to ask.
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Old 10-01-2011, 12:15 PM   #5
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Weirdness in the Doorbell


Are wire ends too long and sticking out and touching the next terminal or nearby metal?

What is the transformer voltage when the button is held down? (Don't hold it down very long or you might burn out the chime unit.)
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Old 10-01-2011, 03:51 PM   #6
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Weirdness in the Doorbell


Negative on the long wires.

I will have to get back to you next week when I am at my parent's house again.

Will post then.

Thanks to all for the help. Still feel free to ask questions.

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