The middle front bar indicator that is used for many status indications such as powering up and then being fully connected when it is solid blue is showing an indication I have not seen documented. The normally solid blue indication has started to pulsate between strongly lit and dimly lit. This is NOT the indication seen when the unit is watering. I suspect it is indicating the RF signal is weak as the unit has started to go on and off line the last 2 days. I DO know the RF signal is marginal from issues I had during installation. But once it was connected to server it has stayed consistently connected since installation - about 2 months ago. During this time the bar indicator was a solid brightly lit blue line - accept when it was in a watering cycle. I have checked the physical location for objects that may be attenuating the RF signal - but have noticed no changes that should effect the RF signal strength. Just want to know if anyone knows for sure, what the pulsating intensity of a blue indicator bar means.
Not rachio related, but if you have a Android device (no clue about iOS but sure there is an equal), you might do a site survey using https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer just to check what the wifi looks like as you walk around your house. It could also be that a neighbor has a node on the same channel.
Thanks for the quick response. I do have a Android device and use WiFi Analytics to check on signal strength. It shows the Rachio Gen 3 is getting about a 50% signal and 12 Mbps. It also indicates the signal is 80% attenuated when it is having trouble connecting. My WiFi router was provided by my ISP (Verizon at the time) and is around 8 years old. So I am pretty sure upgrading my WiFi network will fix the weak signal - just curious if the pulsating intensity blue bar confirms this is the issue - or maybe there is another issue.
I can’t speak to the pulsing issue, but I would say this, for under $50, you can always add a second wifi point, or even make a bridge between them (but doing so will reduce your wifi bandwidth 50%).
I also can’t speak to the app you mentioned, but I trust the one I suggested, it’s been around for many, many years (in android speak). One thing to make sure is that you stand at that location for a period of time to let the averaging average out.
Did you app show all networks on the wifi? You could have a neighbor on the same channel, or worse, a neighbor that likes to pick a non-standard channel.
You might look to see if your router is A, B, G, N or others, that will effect how the wifi is able to navigate your house.
Rachio 3 Color Codes:
https://support.rachio.com/hc/en-us/articles/360003815533-Light-Codes-Rachio-3-
Thanks so much for passing along this indicator light chart. The pulsating blue indicates everything is functioning properly. I just had not looked at it long enough before it started dropping off to realize it would always pulse for dim to bright to dim…
It did reconnect after a day and while connected I measured the WiFi signal strength. I had switched to using a different channel and the signal strength was stronger. This does confirm I do need to work on improving the signal strength if I have this issue again.
I also checked out the WiFi analyzer you sent and like it much better. Thanks for the all the expert advise and help.
@BoomerBen Here is another link, https://www.radio-electronics.com/info/wireless/wi-fi/80211-channels-number-frequencies-bandwidth.php . I have a neighbor that has decided to not follow this quideline, which they can do, but it just causes issues for everyone else. I have contacted him about it, and he claims that’s they way it came, but I highly doubt that is true.
1, 6, and 11, use it or upset your neighbors, IMO. 
Great advise Eckirchn. Thanks for the 802.11 update. I was actually involved in the early days of this standard, but that was over 20 years ago.
Eckirchn - wanted to give you an update on what started this conversation - the Gen 3 kept dropping its connection to the server. This continued to happen from early May until just recently when I installed a second wireless router that I was able to connected to my wired Ethernet that I had added when doing a kitchen remodel 20 years ago (before WiFi). Prior to this I tried using a WiFi extender. The extender provided a stronger RF signal as indicated by the WiFi analyzer smart phone app, you had suggested. But running a speakeasy speed test showed no bandwidth improvement. The second router increased bandwidth significantly and also appears to be favoring different channels. I thought you might be interested in knowing that the extender actually dropped the download speed from 14 to 9.1 mps and dropped the upload speed from 8 to 3.2 mps. As mentioned the signal strength increased from about a 75 % to a 60% attenuation. The second wireless router increased the download speed to 26 mps and the upload speed was now back to 8.7. The attenuation of the signal is about 60% - the same as the wireless extender. While I still do NOT know what improvement (speed, wireless signal strength, different RF channel) was responsible for solving the problem - I thought you might find this interesting. I have an excel spread sheet that captures this, but I am not able to upload it. Be happy to pass it along if interested - would need a personal email address. Mine is bmanny@frontier.com.