I recently purchased a new home, and with it a new Asus RT-AC68U router, and two gen 2 Nest learning thermostats.  I’ve been fighting Nest offline/disconnection issues with my Nest thermostats since I got installed them, and finally found the answer after hour and hours of Googling.  This fix should work with any Asus router, such as the dark knight RT-N66U, RT-AC66U, even if you use the Merlin firmware (which I use).  I will note that in attempting to fix this I also assigned my Nest thermostats DHCP static assignments, but that didn’t help with disconnects.  Oddly in my previous residence I had a Linksys E2500 and a single gen 1 thermostat and never had this issue.

I spent an hour+ on the phone with Nest level 1 and level 2 support and they didn’t really have an answer, but led me to narrow down my options.

Even with my previous fix below, my Nests still disconnected all the time.  I kept reading forums, etc., and now have the following settings, which seem to be working:

DTIM: 3
Beacon Interval: 211
Enable WMM APSD: Enable

Seems to be working.  We’ll see long term.  Lots of people are having issues with 4.3.3 and 4.3.2 and WiFi disconnects.

UPDATE: 3/11/15

Unfortunately, my thermostats still go offline intermittently.  I really wish Nest would get their s**t together.  My thermostat is wired with power.  This issue is seriously annoying, and is pervasive.

They mentioned that WMM sometimes creates issues, and I immediately gravitated to “WMM APSD” in the “Professional” tab of 2.4GHz.  I disabled this feature and I have not had a drop off since.

Set the following parameters in your “Wireless”, “Advanced” section for 2.4Ghz:

“Enable WMM APSD” and select “Disable”

For the record I also have “b/g protection” in “General” off as well, but I’m not sure that has anything to do with it.

 



8 Responses to Fixing Nest Thermostat Disconnects on Asus Routers RT-N66U, RT-AC66U, RT-AC68U

  1. Hi Mike,

    My name is Krishna Bakthavathsalu working in Wi-Fi Engineering team at Nest labs. First of all, I would like to thank you for your detailed summary of the issue and the steps that you took to debug them. I really appreciate your effort here.
    As a follow-up we wanted to further investigate and get to the root cause of this issue. I hope you can provide us with some more information to help us debug.
    To start with, can you please give us the approximate time frame when you first started having frequent offline/disconnect issue?

    Please contact me through my official email kbakthav@nestlabs.com.

    Again, I really appreciate your assistance here.

    Thanks,
    Krishna

  2. Bob says:

    Mike, thanks for posting this info. I was having issues with my Asus RT-AC68P router with the NEST and IP cameras. Changing the beacon interval to 211 seems to have fixed the problem; no clue why that is. The other two settings are default anyway.

    Krishna, I’ll send you an email as well, I had the same problem. Thanks!

  3. Nick says:

    Mike,

    I have been having this issue for quite some time. I normally just rebooted the router and it would work for some time. My wife called and wanted me to change the temp but said there was an error. After googling for a min, I came across this post, I remoted into my ASUS router(which I love), and made the change…she can turn the heater on now!

    Thanks for posting this fix.

    I have the RT-AC66U with 3.0.0.4.376_3602 Firmware.

  4. MT says:

    THANK YOU!!! This issue has been driving me batty for weeks!!!!! I love you man!!!

  5. mark says:

    Changing the beacon interval only worked temporarily for me since it reboots the router.

  6. Brent says:

    It would seem that if your Nest thermostats are randomly disconnecting, you should LOWER the beacon interval, but don’t go crazy: Set it down from it’s default value of 100mS to 95-99mS. If neighboring interference is causing your disconnects, this should improve things for you.

  7. PeterC says:

    Wow I am not going crazy – it’s not only my Nest and Asus giving offline problems.
    Has anyone solved this yet?
    I tried Nest Support a few times including talking to someone in their advanced department, who wasnt exactly very nice to me.
    So close to handing this thing back. It’s been working great for a year, now suddenly without any hardware changes it keeps going offline.

    Thanks for posting your advice, I will try what you suggest.

  8. Rouer Man says:

    Even though this post is old, this has worked for me! I bought new router since I have had some performance issues and my neighbors would create additional interface. And I still had the same problem with Nest… anyway I did lower the Beacon to 99ms from 100ms and presto it works straight away.

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