I have the Honeywell app and it went down for a few hours yesterday or the day before. WiFi was fine as security cameras were still operational. Yet the Honeywell app said the same as yours, that they lost connection.

I'm thinking the app had a bad day. :)

Maybe it wasn't your wifi?

https://downdetector.com/status/honeywell/

https://downdetector.com/status/honeywell/map/

Stax, are you talking to patriceny or me? Anyway, since this occurred overnight, I don't actually know if my internet went down. Maybe I'll check with my internet provider. I also have internet-connected solar panels, and they are hard-wired.

mtv, ditto for me. I also have Honeywell thermostats (of two different model types) which I REALLY like. Three of them in total, at two different locations. All use the Honeywell My Total Connect Comfort site.

I think it was two days ago, I got a total of 6 emails (2 for each stat) that contact had been lost. This has happened a few times before in the 3+ years since I first had two Honeywells installed as part of a complete system replacement. I liked them so I had one installed when I had a a new equipment install done two years later at the second location.

The event suggests a hiccup or a system maintenance event on the Honeywell side, not a problem with my own internet connections, because it was simultaneously reported for two different locations nearly 500 miles apart.

It was of no consequence because I was at one location and had no need to change settings remotely at the other. Note that when a stat loses a connection, it continues to function normally with whatever settings it has. I've deleted the emails but I think I received them in the evening and the next morning when I noted them and tried to connect to the stats, they were functioning normally. In the evening for my West Coast location suggests it may have been later at night at the company's ground zero server or office location I presume to be east of where I am in a later time zone.

As an FYI, Honeywell no longer owns the home thermostat business. It dropped it into into a new subsidiary that was spun off two years ago. The new company's name is Resideo and it continues to operate the businesses and use the Honeywell name under license.

At least you liked your post - it does not address the OP's situation, however. lol

Thanks to Elmer, you relieved my concern. As I earlier said, since this happened overnight while was sleeping and not using the internet, I don't know if it was just the WiFi or the entire internet service. I'll assume it was Honeywell/Resideo's hiccup.

Well, it happened again, about 10 days ago. I was away and started getting these messages from Honeywell every half hour. By the time I got back, my email box was almost full! There was actually nothing wrong with the heat, but the thermostats still weren't communicating. I've tried resetting my router and cable modem, but no luck. I'm still working on it but haven't been successful yet. Any network tracing tools you can advise?

I have a Honeywell/Resideo thermostat. Their network, or the part of it that services my geographic area, was down for half a day a month or so ago which triggered a connection fault on the thermostat although nothing was wrong with my ISP or WiFi in that instance.

Keep in mind that the thermostat connects through the homeowner's ISP, to Resideo's network, which then sends data back to the homeowner through his ISP to the thermostat, to the phone app (which I don't use) which may involve either cell data or the homeowner's WiFi, alerts if any are set up to the homeowner's e-mail (whatever service that may be), and to the Resideo web portal viewed in a browser. A data-transport problem can occur anywhere along those paths.

I had the same experience not too long ago, it may have been at the same time as you mention. For whatever reason, the Resideo (operating as Honeywell home or some such) seems to have a fragile network setup. It hiccups sometimes. Outages are never too long.

The good news is, the thermostats operate normally and follow the previously entered settings with or without a connect to the internet. What's lost with a hiccup is the ability to CHANGE the existing settings - whether it's the temperature, the schedule, or to put on or take off a Hold.

As above, I have them in two different locations (separated by hundreds of miles). A few times when the power has gone off at the location I'm absent from, when the power has come back on, the thermostats have been able to reestablish internet connections once the infrastructure (the modem and router providing the Wifi signal) are back on. In one location, it's a Redlink system and a return from a power outage involves an extra step. There's is a separate, standalone internet gateway that connects to the router on one side and then provides Redlink RF transmit/receive traffic on the other. It's the Redlink signal from this Resideo/Honeywell gateway that the thermostat connects with, not a Wifi signal.

I wouldn't be concerned about it. It happens every now and again, not that frequently and never of long duration. I find the same is true with other internet sites for businesses I'm a customer of or other sites I interact with. Sometimes, I just can't log in or continue a session because of what appears to be a problem on the other side. I think it's to be expected.

Yes, my internet is flakey. But this Honeywell outage has been over a week. My primary concern (in the winter) is that when I'm not home, it's the only way I know if my heat is on. The outage could be caused by a power outage!

mtvhike, the Honeywell outage I experienced was for less than 6 hours.

If you home has power and the thermostat is set, connection may be a peace of mind issue but not essential. If you've set it to hold at 55 degrees, as an example, why would you expect it to not be doing that?

Here's a work around for a double check. Buy yourself a Wyze Wifi camera ($30) and a battery operated digital display room thermometer - less than $15. Aim the camera at the thermometer and check out what's happening.

If you have flakey internet, that's another problem.