I just want to share my recent experience (August, 2019) installing and troubleshooting my install of the Ring Video Doorbell 2 with the Ring transformer. I first purchased a 24 VAC transformer sold on Amazon by a third party. Wired it up, but it did not power my Ring VDB 2. Spoke to a very good support person at Ring and found the Ring document indicating that if you are hard wiring the Ring VDB 2 without a mechanical or digital doorbell already installed at your house, you needed to solder in a 25 ohm, 50 watt wire wound resistor into the circuit. The document gave links to suppliers of the resistor. I bought mine from Digikey. I returned the transformer sold on Amazon and bought the Ring transformer off their site. I soldered the resistor into one of the conductors (either one is OK) coming out of the Ring transformer and used wire nuts to the solid core wire I had routed from my Ring VDB 2 into the house. I then plugged in the Ring transformer. Yikes!!! Smoke coming from the resistor and it became red hot! Also, the Ring VDB 2 was not indicating hard wired in the app and the white LEDs were not being powered on. Called Ring support. Polite, but no help. So, I thought, is my problem the transformer, the resistor, my wiring or what??? Eliminated transformer as problem by measuring with my multimeter 27.7 VAC power coming out. Good. Eliminated resistor (after it cooled down) by measuring 25 to 26 ohms with my meter. Good. I was wondering if my soldering job was up to standards, but doubted that it was my problem. I then realized, the wiring coming from the transformer is stranded, perhaps 20 to 22 gauge rated. The wire to which I connected the transformer wire (after the resistor integration) was solid, 18 gauge rated. I remembered that because there is a potential overheating problem, you do not want a wire of thicker gauge further away from your source (the transformer) than a thinner gauge wire next to your source (again, the transformer). I abandoned the solid, 18 gauge wires going out to the Ring VDB 2 and instead connected via wire nuts another run of standed, 20 to 22 gauge wire. Voila! Everything worked as designed. No smoking or hot resistor. A word of caution that I can confirm, but which has been mentioned by others: the app on your smart phone may not (make that, probably will not) update for a few hours. So you will not see the Power: Hardwired immediately, only Power: Battery. Your telltale sign that the hardwiring is indeed working is the continuous lighting of the white LEDs on the face of the Ring VDB2. Hope this helps someone!
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