Need Help: Mechanical Chime Won't Ring After Transformer Replaced

[ftresi]

In my post #7 I attached a diagram which had the long run to the door chime C and asked you where the short circuit was. There is another wiring scheme which you may have though in which the long run is to the Nest Hello door push N; I have sketched this out and attached it.

Please would you study the two diagrams in #7 and here in #10; which is closest to your installation in terms of where the 'long run' heads to?

If your installation is more like the diagram here in #10 where was the the short circuit/repair done - at green or yellow? If it was more like #10 then you can see there is the possibility of causing damage to the transformer and the disc if the short was at the yellow point whereas only damage to the transformer at the green point.

The run that was repaired is at the green point. The wiring from the chime back to the door (yellow) didn't have to be repaired.

I need to do some homework and take voltage readings. I will also try removing the chime connector to see what happens. And maybe try reversing the wires (could reversed connections to the chime cause this problem???).

I'm busy this week with assorted things but am taking about two weeks of time off from work starting next week so I'll have time experiment then.

Thanks again.

 

[marconi]

The literature for the NEST Hello says it should not be used without the Chime Connector in circuit. The orientation which matters is to do with the Chime Connector wires: when the NEST Hello and Chime Connector was first unboxed the wires which were into connectors are connected on the Nest and Transformer side. The wires without connectors go to the chime if used or are each insulated.

 

[ftresi]

The literature for the NEST Hello says it should not be used without the Chime Connector in circuit. The orientation which matters is to do with the Chime Connector wires: when the NEST Hello and Chime Connector was first unboxed the wires which were into connectors are connected on the Nest and Transformer side. The wires without connectors go to the chime if used or are each insulated.

Correct - that's how the chime connector is connected. I was just wondering if maybe the two ends without connectors (that screw onto the chime terminals) are reversed. Could that cause my problem? Could I cause any damage by trying to reverse them?

 

[marconi]

Yes try reversing the connections to the chime as you suggest but at the moment I do not think that is the problem since we are dealing with alternating current. But I may be wrong and the chime connector outputs direct current and your chime may be sensitive to the polarity of the applied current.

 

[ftresi]

I finally had some time to look at this some more. I am happy to report that all is working now.

I took a closer look at the chime and it works now. I think what probably happened is that one of the wires was interfering with the spring on one of the plungers and it was keeping it from striking the plate. I stumbled upon this accidentally when I poking around inside there and suddenly all worked.

So I feel a little dumb but am happy that it turned out to be a very simple problem. I'm not sure why I didn't notice it right away because the very first thing I did when the chime stopped working was make sure nothing was getting in the way of the mechanical innards of the chime. I think one of the wires was interfering with the BACK of the plunger and it wasn't visible upon inspection.

I thank all of you for your help, but his turned out to be a very simple issue.