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Yes you should up grade the transformer. Mine was measuring at 15.7 VAC
and the door chime would not work. I bought a 16 VAC with 30VA and it
now works flawlessly.
I had a similar problem with my wired gen 2 doorbell today. The voltage
was 15.8 VAC and the camera etc. worked just fine but the mechanical
chime inside would not work. I was about to return it for a new one due
to a "defective chime puck" but I dec...