topic Re: Cannot get past error m15 when installing Nest Learning Thermostat in Nest Thermostats

Cannot get past error m15 when installing Nest Learning Thermostat

closuredr — Tue, 23 Nov 2021 19:59:01 GMT

I purchased a new Nest Learning Thermostat. Everything appears to have physically installed properly, however I cannot get it to work with the app. I have two wireless networks at home and can connect to either of them just fine when I manually connect to them from the thermostat itself. I then can pull current weather for my zipcode and pulling the logs I see it reaching out to the broader internet. I have tried the following so far and all result in an M15 error.

1. Reset the thermostat many times.

2. Reinstalled the app on a Galaxy S10 phone.

3. Installed the app on a different phone. A OnePlus 9 phone.

4. Tried connecting through two different vendor Wireless AP's

5. Changed one of the networks to 2.4ghz only.

6. Made sure *.nest.com was whitelisted on the network and disabled all filters.

7. Tried to ensure the software on the theromstat is up to date.

When I tail the logs on the wireless routers and I can see it connected to the wireless network, but it will never register with the app. Not sure what to do next.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

laurentbourg — Tue, 23 Nov 2021 20:25:15 GMT

When you say you cannot get it to work with the app, do you mean the Google Home app, the Nest app, or both?

Re: Cannot get past error m15 when installing Nest Learning Thermostat

closuredr — Tue, 23 Nov 2021 20:31:18 GMT

The Nest app installed through the Play store.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

laurentbourg — Tue, 23 Nov 2021 20:45:44 GMT

Ok. Do you have any other Nest devices in your house? Like a camera, protect, or other thermostats.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

laurentbourg — Tue, 23 Nov 2021 20:49:11 GMT

Also what is the exact TD error code associated with your M15? Then check this https://support.google.com/googlenest/answer/9703359#TD018&zippy=%2Ctd

Re: Cannot get past error m15 when installing Nest Learning Thermostat

closuredr — Tue, 23 Nov 2021 20:49:21 GMT

This is my first Nest device.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

closuredr — Tue, 23 Nov 2021 21:17:49 GMT

The app goes through all the way to the finishing portion and then just hangs. From there it returns error TD009 (18.1). I have tried restarting both the app and the phone and have tried a completely different phone as well.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

laurentbourg — Tue, 23 Nov 2021 21:41:00 GMT

Ok thanks. Do you have multicast enabled on your router for all devices? The Nest thermostat requires full multicast support.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

closuredr — Tue, 23 Nov 2021 21:57:26 GMT

Multicast is enabled and I have other IoT devices using it that work on the network currently such as Philips Hue lights and a Ring doorbell.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

laurentbourg — Tue, 23 Nov 2021 22:48:19 GMT

Ok. When you performed item 5 in your original email, was your phone connected to the same 2.4ghz network as the thermostat?

Re: Cannot get past error m15 when installing Nest Learning Thermostat

closuredr — Tue, 23 Nov 2021 23:18:58 GMT

It was. Each time I have attempted to add it to the app I have made sure to add it from the same network. The phone seems to connect to the thermostat and lets me choose a network. From there it tests the network. Then it appears to try and connect. The phone goes to finalizing and then it just hangs there as if it is hanging on the actual registration of the device and appears to timeout.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

laurentbourg — Tue, 23 Nov 2021 23:21:21 GMT

Interesting. I assume you just bought it? If yes I would just exchange for another one to rule out any possibility of factory defect.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

laurentbourg — Tue, 23 Nov 2021 23:47:18 GMT

I see 3 possibilities:

- A factory defect. Easy to rule out by returning it

- An obscure incompatibility with your setup. Unlikely considering your due diligence and all the additional items we covered

- A Nest Thermostat you thought you bought new but that was actually a return. Somebody else set it up with the Nest app and it is actually already registered hence conflicting. This will also be resolved once you exchange it.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

Jessica27 — Wed, 15 Dec 2021 23:29:33 GMT

am having the exact same issue and error codes. I have attempted almost every tip on the internet with no success. The Nest is not new and was working. After changing the router we have run into this issue. The router is a dual band router and the 2.4 GHz and the 5 GHz have different names.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

closuredr — Thu, 16 Dec 2021 00:11:15 GMT

This was resolved for me by setting up my phone as a mobile hotspot and using that to register. Once it was registered I moved it back to my home network and everything has worked fine since. Best of luck.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

hb861 — Mon, 17 Jan 2022 23:20:29 GMT

Same issue i faced today while replacing a Gen 1 Nest Thermostat with a Google Nest Thermostat.

Device did not recognize any Wi-Fi networks nor was I able to connect to Nest App, I took off the device and moved it closer to the Nest doorbell and other thermostat at which point it detected the Wi-Fi network but still would not connect to Nest App. So I used my iPhone as hotspot, connected to Thermostat and connect it to Nest app vie cellular network. I then installed it back on second floor and switched network to Wi-Fi.. no issues since (fingers crossed).

Re: Cannot get past error m15 when installing Nest Learning Thermostat

Gord1 — Fri, 06 May 2022 00:41:16 GMT

The nest app

Re: Cannot get past error m15 when installing Nest Learning Thermostat

nester19 — Fri, 31 Mar 2023 22:53:07 GMT

nest app

Re: Cannot get past error m15 when installing Nest Learning Thermostat

KMW — Tue, 18 Jul 2023 02:01:54 GMT

So I've been running into this issue since I had reset my network for like a month. I had recently got my own router, and did some not so average networking things. The issue was the firewall, so before utilizing a hotspot check your firewall settings and/or if your using a PiHole check that as well. 🤦🏾‍♂️ Going to mess around with it more to see if the router outputs a log entry when it blocks the setup of the device.

Re: Cannot get past error m15 when installing Nest Learning Thermostat

jbx1954 — Fri, 11 Aug 2023 12:42:12 GMT

I finally found a simpler solution (courtesy of phxflyboy) to the problem of not being able to get my Nest thermostat setup completed by the Nest App. My Wifi is fine, the thermostat is online. I tried starting from factory install, deleting/reinstalling the app but to no avail. When I got to the point of install where the app takes over, it would ask "what room is this in", then the app promptly froze for minutes. Happened over and over.

Guess what: at this point, set your phone down and go do something else. Patience is the key. It took about 5 minutes, then suddenly, my thermostat install was finished by the app and Google Home recognized it immediately!! If only the app added one simple sentence at this point: "this make take several minutes, your app may appear to be stalled".