Ecobee3 WiFi Connection Troubles

Ecobee3 thermostat WiFi troubles

In a previous post I wrote about my transition from Nest to Ecobee3 thermostats, and how the biggest benefit of the E3 was the use of remote sensors.

After several months of use, winter and summer, I find the remote sensors really do work very well, and our bedrooms remain at the desired temperature, while the areas around the thermostats can be warmer or colder.

But, the E3 is not perfect, there are two recurring problems; the remote sensors would report offline, and the units would lose network connectivity.


I’ve received sensor offline alerts a couple of times, typically happens early mornings, maybe interference, don’t know, the sensors never move from where they are placed.

Every time a I get a sensors offline report, the sensor already restored connectivity. This behavior is very annoying, I will get two emails a minute apart, and the E3 UI will have an alert saying sensor offline, I click ok, and then immediately an alert saying sensor online.


I expect the E3 to have some sort of grace period before it deems a problem so important that it needs to notify me. As is, it is just an annoyance as there is no remediation action to take.



The second problem is the E3 loses network connectivity, this is a real problem, as the units remain offline until power cycled, and to power cycle the E3 has to be removed from the wall bracket, i.e. there is no reboot menu option.

I reported this problem to Ecobee support in October, and on the SmartHomeHub community forum. Yes, it is a bit pathetic that Ecobee does not have their own support community forum. Ecobee had me reserve static IP’s in the DHCP server, setup a dedicated 2.4GHz SSID, still disconnects. By December the problem was still happening, and Ecobee support escalated the problem to their development team, it is two months later, and still no updates from Ecobee support on the problem.


Through my own research and experimentation I suspect the problem to be that the E3 is unable to handle a WiFi channel change, and unable to roam between access points. There are some conditions that trigger the problem that I cannot explain.

I have multiple access points in my house, same SSID, different channels, 2.4GHz and 5GHz bands. I tested with Ubiquity UniFi AC and with Ruckus/Xclaim Xi-3. And in case you’re wondering, no other devices in my house have any problems with WiFi, even with dynamic channel selection.

I can make the E3 fail by either changing the AP channel, or by making it roam to a different AP, also changing channels. If I configure the AP’s to use auto channel selection, then the E3 will fail as soon as the AP chooses to change channels (UniFi does this on startup, Xclaim does this dynamically). If I manually change the AP channel, the E3 will fail. If I take one AP offline, the E3 will fail to roam to a different AP (on a different channel).

Even with my AP’s configured with static non-overlapping channels, the E3 would still sometimes fail, requiring a power cycle. I do not know why this would happen, as signal strength by the E3’s are perfect.

On the plus side, the E3 units remember the schedule, and even when offline, they continue to operate.


Bottom line is E3 WiFi is not reliable, and E3 support/dev is not responsive.


Ecobee3 Thermostat with Remote Sensors

We’ve had a particularly warm summer, for our very moderate area, and between my wife and my parent’s in-law, they were constantly changing the thermostat temperature, leaving nobody particularly happy, and our electricity consumption skyhigh. I needed a better solution, I found one, but it has some quirks.

I was an early adopter of the Nest Generation 1 thermostat, and when we moved to our new house, Nest was still the best available, and I installed two Nest Generation 2 thermostats, one upstairs, and one downstairs.

Nest used to be an innovator and leader in the home thermostat space, and then two things happened; they were acquired by Google, and competitors like Ecobee and Honeywell released very competitive products. The just released Nest Generation 3 thermostat has no new notable features, it is simply thinner, not unlike its competitors.

The one feature I, and many other users, asked for was remote temperature sensors. In many homes, like ours, where there are two HVAC units, one for upstairs and one for downstairs, with no room specific dampers or temperature control, the upstairs and downstairs air mixes and causes large temperature differentials between closed rooms and open spaces. Adding to that warm air rises and cold air falls, so in the summer the upstairs pumps cold air downstairs, and in the winter the downstairs pumps warm air upstairs, this again leaves bedrooms too hot or too cold.

Ecobee solved this problem, to a large degree, with the Ecobee3 thermostat, that comes with one remote sensing unit, and extra sensors can be purchased at $35 per sensor. The latest version of their thermostat is also Apple HomeKit compatible, allowing Siri to control the thermostat.

There are 3rd party integrations that can control the Nest temperature, like Wally at an additional $299, or SmartThings at an additional $139, but these are integration solutions, not integrated solutions, and makes the Nest solution much more expensive, especially considering the Ecobee3 (with one extra sensor included) and the Nest Gen3 are both $249.

There are alternate solutions like EcoVent that controls the individual vents per room, but that adds an additional $499 minimum for two rooms.

The Ecobee3 solution cannot control the temperature in each room, for that you really need a split AC unit per room, but it does allow the temperature sensing logic to take input from any number of rooms. And in my case, I am specifically interested in the temperatures in the bedrooms, not the general open areas.

Replacing the Nest with an Ecobee3 was easy, the Ecobee3 is slightly thinner than the Nest Gen2, and slightly larger, with that extra size used for a multi-color touch display.

Size Comparison

The remote sensors come with stands, wall screw mounts, and wall sticky tape mounts, they are pretty small and unobtrusive.

Sensor Size

The WiFi setup was really easy, and the first time I’ve seen this particular scheme in action, I believe it is called Wireless Accessory Configuration (WAC), not sure, Apple documentation is as always in short supply. Basically it worked like this; install the EB3 app on my iPhone, EB3 told me to connect my phone to the EB3 SSID, my phone asked me if I want to connect the device to WiFi, select yes, and the EB3 was automatically connected to my home WiFi, no passwords, no hassles, easy.

For each thermostat install the EB3 app asked me details about my house, address, size, construction, etc. This was annoying, one house, one set of details, multiple thermostats, why do I need to configure this for every thermostat. The Nest config was always very easy, one set of options per house, multiple thermostats. A call to EB support told me I need to create a group, then add the thermostats to the same group, then select what options I want to share between thermostats in the same group, and this can only be done from the web portal. This was a setup and first experience usability fail.

The second problem I ran into was the time configuration, the EB3 correctly selected Los Angeles as the time zone, and synced the time, but the displayed time was 3 hours ahead, East Coast time instead of Pacific Time. I fixed this by manually changing the timezone to something other than LA, saving, then changing it back to LA, and the time was correct. I did send EB support an email about this, and they replied that I need to make sure I have the correct time zone selected, right.

Time Zone

Pairing the remote sensors was really easy, stand in front of the EB3 and pull the plastic tab to let the sensor battery make contact, the EB3 detects the sensor, and lets you pair it, and enter a sensor name. The EB3 thermostat UI allowed me to use non-alpha characters, e.g. “Childs Room”, note the apostrophe, but when I later renamed the sensors, the mobile app and the web app restricted names to numbers and letters only, a slight inconsistency fail.

Sensor Naming

Configuring the schedule and comfort zones was easy and intuitive. I particularly like the concept of the comfort zones, and reusing them in the schedule, vs. the Nest’s more primitive setting of desired temperatures at times of days. This is where I configured the night comfort zones to use only the sensors in the bedrooms, and ignore the temperature at the main thermostat. Made a huge difference in comfort and AC runtime.

After a couple days of use I noticed something weird, the AC would turn on, but the thermostats would show the current temperature is still below the set temperature. This happened with both thermostats, and only in the afternoon. The schedule only called for 74F after 8pm during the night time comfort zone, this was around 7pm, when the set temperature was 78F.

Something is clearly wrong with the scheduler and the schedule. My bet was the scheduler is still using East Coast time (turned out I was wrong), Ecobee phone support was already closed, so I had to wait for the following day.

While I was looking at the System Monitor feature, very neat, I noticed gaps in the data. After a bit of research I found that Ecobee is having scaling problems, and their backend cannot handle the load, may be exacerbated by the Apple store kicking out Nest and now selling Ecobee3, or HomeKit integration, or poor planning. It was also weird that Ecobee does not run their own support forums, the Ecobee community supports themselves at the SmartHomeHub forums. One intrepid forum user created an availability graph based on his data gaps, clearly shows the recent problems.

I called Ecobee support, and they explained what was going on with the schedule; the thermostat has a feature called Smart Recovery Mode, in this mode the AC starts running before a schedule change in an attempt to reach the desired temperature when the schedule starts. And that this prediction takes a week or so to become more accurate, and that it can be impacted by fluctuations in the weather. Ok, makes sense, but usability fail by not making this behavior clear in the status UI.

Smart Recovery

As for the gaps in data, Ecobee support said they are busy migrating data, that this impacts backend performance, and that all systems should be operational in a week, and no data should be lost, slight contradiction to the post on the SmartHomeHub forum, but at least acknowledged.

I am pretty happy with the E3, the remote sensors really do make a big difference in efficiency.


[Update: WiFi troubles with the E3]