Reddit reviews Broan-NuTone C907 Doorbell Transformer Compatible with Smart Video Doorbells, Easy Installation Lock or Wall Mount Door Chime, 16V, 30VA

Ring $100/yr and save an extra $20. The Ring Pro is solid, they are now in a 3gen for it which I just received 2 days ago as a replacement. (Old Pro was marked as needed replacing by ring for some reason). To do it right make sure you have the right transformer. Ring offers one but you can find a NuTone on Amazon a bit cheaper. .
The Alarm is solid, zwave+ platform (also zigbee) and don’t forget to get the smoke alarms so you can print out a full cert to give to your home owners for a discount on premium.
Within the last few days, Amazon alexa released the Guard update turning all your echos into smoke/co listeners and glass break detectors. IMO, it was the last thing missing from the ring alarm.
The issue with the pro is running the wrong transformers to power it. My 1st pro lasted 6mo, 2nd 1.5yrs and now I got my 3rd which has a slight different build, they also included 2 angle wedges with the unit.
The smart lock thing is slick, just make sure to visit their site to see which is compatible.

Lastly, if you’re going all in with Ring, stay away from battery cameras and invest in a mesh system that has triband and mu-Mimo to prepare you for the future of IOT.

GOOD LUCK!

No, they will still recommend a higher one as soon as you have any issues.
I had the 10VA at first and it seemed to work fine, but eventually it seems it affects the internals of the unit causing issues.

I'd save the headache and get a new one.
This is the one I got on Amazon for $24:
NuTone C907 16V, 30VA Transformer

It replaced my existing one with little effort.

Check your doorbell transformer. We had a 16V 10VA when I first installed the Ring Pro and was getting video issues and the mechanical bell would barely ding (not full ding dong; we have 2 mechanical bells).

Replaced the transformer with a 16V 30VA (from Amazon) and it's all good now.

EDIT: Adding link to the transformer I ordered and installed: https://www.amazon.com/NuTone-C907-16V-30VA-Transformer/dp/B001POBN92/

I have the Pro set up as well. Looks like what was happening when I set mine up. Come to find out that since I had it at an older house, the doorbell transformer wasn't strong enough and causing it to 'reset' since it would drop power and 'reconnect' back to power. It was only a 10VA transformer. I read it somewhere on some forum that you need to make sure your doorbell transformer is around 30VA. I bought this one off Amazon, installed it and have not had any issues since. The flashing typically means it's in setup mode waiting to connect (even though you may have already connected it once before).

Purchase a 30va 16v transformer from Amazon. That will solve the low voltage issue. Worked for me and solved the problem. The issue is amps not voltage on the line.

This is the one to buy from amazon. https://www.amazon.com/gp/product/B001POBN92/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

I got this at the recommendation of Ring customer support based on my physical doorbell model: https://www.amazon.com/gp/product/B001POBN92/

https://www.amazon.com/gp/product/B001POBN92/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

30A. Works like a charm.

Some have stated that you really need a 30VA transformer for a ring pro connected to a mechanical chime. I had problems with freezing when the doorbell was rung but that all went away when I upgraded my transformer to this one:
https://www.amazon.com/gp/product/B001POBN92/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1

That's the transformer. It has a 16VAC/10VA output, which will not be sufficient for a Ring Pro setup. My house initially had a similar transformer and I replaced it with a 16VAC/30VA transformer.
Here's a link: https://www.amazon.com/gp/product/B001POBN92

I was thinking bandwidth/wifi, but thats not the case, at least in my short time running tests. I'm running 3 ubiquity ac-pros and a custom built pfsense router. I've ran multiple tests on bandwidth, dropped packets, wifi signal etc and it's rock solid. The only thing that makes sense is my transformer isn't providing a consistent level of power. I wasn't even leaning that direction until another user said they had a very similar issue.

Also, when dealing with power having it sit inside in a controlled environment isn't even close to the same as having it outside in the cold and having multiple variables.

Here's the transformer I purchased. NuTone C907 16V, 30VA Transformer https://www.amazon.com/dp/B001POBN92/ref=cm_sw_r_cp_apa_6AbRAbQKW84XA

this is usually what people recommend: https://www.amazon.com/NuTone-C907-16V-30VA-Transformer/dp/B001POBN92

​

I personally use it as well. no problems keeping the Pro powered and mechanical chime ringing like normal.

NuTone C907 16V, 30VA Transformer https://www.amazon.com/dp/B001POBN92/ref=cm_sw_r_cp_apa_A1tBzbEE476A2

I think the VA rating matters more than the actual voltage - and you wouldn't need to replace your chime. Something like this - 16V but 30VA instead of the more common 10VA.

You're running a 10V / 50VA now? Sure it's not .5A?

*edit - decimal place

Yes, the pro will ring the mechanical chime.

You will need to install a compatible chime kit:

https://support.ring.com/hc/en-us/articles/209028546-Ring-Video-Doorbell-Pro-Chime-Kit-Compatibility-List

​

I would also suggest upgrading the transformer to a 30VA unit and ditch what comes with the chime:

https://www.amazon.com/NuTone-C907-16V-30VA-Transformer/dp/B001POBN92

Updating this... I've installed the new transformer recommended by pandaman1784 ( https://www.amazon.com/NuTone-C907-16V-30VA-Transformer/dp/B001POBN92 ) and I do get 18-20VAC from the door bell wiring behind the ring when measuring but looks like the ring pro has a pulsing white light... rings the internal chime, setup button still has no effect what so ever and if I push the door bell the white light goes out completely after the blue circle and then after a few seconds to a minute goes back to a pulsing white light (Reboot?).

​

At this point figured I'd wait it out maybe 30mins see if it does anything different with the extra voltage and if it's still behaving funny take it back to the BestBuy and exchange it? Any other ideas?

Pictures of new vs old transformer:https://imgur.com/a/BGDBM8l

New one had a ground wire but I also had no ground point so I capped that off, old had no ground wire.

UPDATE 2: Got impatient, exchanged it... worked just as well as the last one was able to link it to my ring account get it connected on WiFi etc. The only issue I have now is Live view showed a black screen and then I started just getting "Streaming Error" after that with no live view and no motion events or etc... could have swore after connecting the first one the motion events were almost immediate and I'd get the notifications in the app; guess this kinda warrants a separate thread though as it's no longer a low voltage issue/confirmed that even though I had low voltage the other one seemingly was damaged.

I'll let the more electrically inclined reply, I just know from an older discussion about this. I think you were able to test somewhere on the chime itself? I would recommend getting a bigger transformer either way. This one works perfectly and provides plenty of power:
https://www.amazon.com/gp/product/B001POBN92/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

Installed this transformer and directly ran the wire to the Ring Video Doorbell Pro a few months back (No existing chime, and brand new wiring direct to Ring Doorbell PRO).

I have zero issues with voltage/power until this morning when I noticed the red lighting bolt icon on my camera.

https://www.amazon.com/gp/product/B001POBN92/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

Is this a bug, or am I missing something? Curious if this is a known issue or something else I can solve for with a software update, etc.?

https://imgur.com/A3P3zMh

Check the setting under Device > Gear icon > Doorbell Kit Settings > Ring my in-home doorbell

It appears if the voltage on the Ring Pro drops too low when ringing the doorbell, it turns this setting off. I fixed the issue by replacing my 16V 10VA transformer with a 16V 30VA transformer. 16V 30VA Transformer on Amazon

I went and took everything apart and found the manuals, it is actually really straight forward. You just need a [transformer] (https://www.amazon.com/gp/product/B001POBN92/ref=ox_sc_act_title_2?smid=ATVPDKIKX0DER&psc=1) which you can pick up for not much to turn the 100~110v to 16v, and you are good to go. Right now the video display unit does that but for a clean install I want that thing gone. And right now Best Buy has a killer deal on the Ring Pro I might have to go all in.

Maybe double check that your mechanical doorbell can handle 24V. Mine said 16V, so I ended up getting this 16V transformer

Lowe's model: https://www.lowes.com/pd/Utilitech-Multi-Color-Doorbell-Transformer/3482857

The one many people here prefer:
NuTone C907 16V, 30VA Transformer https://www.amazon.com/dp/B001POBN92/ref=cm_sw_r_cp_apa_i_UAz-AbJNKY54Y

I personally went to Lowe's since I could return it if it didn't work. Mines been great though.

Here is what I got
Transformer:
https://www.amazon.com/NuTone-C907-16V-30VA-Transformer/dp/B001POBN92/ref=sr_1_5?ie=UTF8&qid=1521326571&sr=8-5&keywords=doorbell+transformer

Chime:
https://www.amazon.com/NuTone-LA11WH-Decorative-Two-Note-Textured/dp/B001EG272I/ref=sr_1_5?ie=UTF8&qid=1521326631&sr=8-5&keywords=nutone+chime

16V is enough, what matters is the power number. Nest require at least 10VA. 30VA is enough for 3 smart doorbell.

NuTone C907 16V, 30VA Transformer https://www.amazon.com/dp/B001POBN92/ref=cm_sw_r_cp_apa_SstRAb67CZY6H

You'll have no problem if you use this with anything you want to power.

It's large though

Most people would recommend a 16v/30VA like this one:

https://www.amazon.com/NuTone-C907-16V-30VA-Transformer/dp/B001POBN92/ref=sr_1_6?crid=274VP6GZXISVI&keywords=16v+30va+doorbell+transformer&qid=1567749968&s=gateway&sprefix=16v%2Caps%2C157&sr=8-6

That's weird that your transformer doesn't show a voltage rating. Are you sure you're looking at the right thing?

I just bought mine and had a similar issue as yours. I figured out that it wasn't getting enough juice even though it was the minimum required to run the doorbell. It would constantly be good voltage during the day but once it hit night time and night vision kicked in it would freeze up and disconnect. Ring recommend I upgrade my transformer and provided me with the Amazon link since the one they sell was sold out. I bought It and so far the Ring doorbell been has running flawless with no issues such as freezes or disconnects.

Link in case you wanted to try.

https://www.amazon.com/NuTone-C907-16V-30VA-Transformer/dp/B001POBN92/ref=sr_1_2?ie=UTF8&qid=1522996843&sr=8-2&keywords=16v+20va

Added note for the issue if having to go and buy a new transformer. Ring issued me a free chime which was cool of them.

That's what I figured you had, so you'd need to upgrade the transformer for the Pro. The Nutone C907 is 16VAC@30VA and the one I generally use. https://smile.amazon.com/NuTone-C907-16V-30VA-Transformer/dp/B001POBN92/

Just shut off the breaker that powers the transformer and its a like for like swap (though the 30VA transformer is physically larger, the connections are the same). And then just install the Ring Pro in place of the button. And install the Pro Power Kit's black wires with one under the screw for the Trans terminal on the Doorbell chime, and the other under the screw corresponding to the button you're using (front or rear). So usually it would be front+trans, and it doesn't matter which wire goes under which terminal. Just make sure you leave the existing wires in place. It just piggybacks on those two terminals. Then restore power to the transformer and you should be in business. Note that it can take up to 20 minutes before its ready to setup, since it will charge up the little battery that is inside that it uses to bridge the power when it has to ring the mechanical chime, which causes it to lose access to AC power for a few seconds. That's also why it needs the bigger transformer, so it doesn't use that battery for other purposes, like supplementing an undersized transfomer, which would kill that battery in a year, vs 5-10 years with normal use. So to use the Pro, you definitely want to upgrade the transformer.

I'd recommend swapping the transfomer and keeping the Pro, rather than downgrading the Ring. The Pro is a much better device with the pixel-based detection and you'll get ~1 min videos plus the event that triggered the alert, vs the battery models (Doorbell 1&2) which only record 30 seconds, and only after they're woken up by motion, which means the event that triggered them is not recorded on battery devices. Plus the motion zones are so much better than relying on PIR detection that is imprecise.

Seems like you have a small transformer. It looks like it says 5VA which is small. Get one that is 30VA and outputs 16vac. Like this one NuTone C907 16V, 30VA Transformer https://www.amazon.com/dp/B001POBN92/ref=cm_sw_r_cp_apa_hA1KAb4T9SPQY

That's the first step. Then see if your ring pro can function properly.

This is the one that I ordered.

NuTone C907 16V, 30VA Transformer https://www.amazon.com/dp/B001POBN92

The one you listed above showed 20-30VA so I thought I would go with a single voltage transformer that had only 30VA. I am glad to hear it is working for you though.