topic Re: Nest 4th Gen Thermostat - Error Code N416 in Nest Thermostats

Nest 4th Gen Thermostat - Error Code N416

beyercj — Sun, 02 Nov 2025 13:52:44 GMT

My thermostat display is showing a System issue with website (g.co/nest/n416). The website is not valid and the error code n416 doesn't exist on the support page (https://support.google.com/googlenest/answer/9240096?hl=en#zippy=%2Cn-help-codes). When I look at the wiring menu on the thermostat, it says N416: Electrical issue on W1 wire.

This thermostat is connected to a gas boiler with 3 zones. The boiler is working and the house is heating including the zone that this thermostat is connected to.

Anyone have any thoughts on what the issue is?

Re: Nest 4th Gen Thermostat - Error Code N416

Akacperski — Sun, 02 Nov 2025 16:01:46 GMT

Following this thread as I just installed my thermostat and it’s showing the same message. We need to figure out if perhaps this is just a technical glitch?

Re: Nest 4th Gen Thermostat - Error Code N416

beyercj — Mon, 03 Nov 2025 12:20:11 GMT

I restarted the thermostat and the error code has not come back.

Re: Nest 4th Gen Thermostat - Error Code N416

Akacperski — Mon, 03 Nov 2025 15:12:50 GMT

so you did a hard reset just to confirm?

Re: Nest 4th Gen Thermostat - Error Code N416

beyercj — Tue, 04 Nov 2025 11:51:11 GMT

I did a soft restart.

To restart from the menu, press the display, go to Settings, select Reset, and then choose Restart.

Nest Gen4 Invalid Error Codes

Dan2e — Wed, 05 Nov 2025 15:40:25 GMT

Getting invalid nest codes, originally N420 then N416 after a reset. Wiring hasn't changed and it was up and running for months already without issue. I have an older gen Nest device for the first floor of my home which is heating fine so I know the gas furnace is running. Anyone else having issues with this? I feel like it's a technical issue?

Re: Nest 4th Gen Thermostat - Error Code N416

virnab — Wed, 05 Nov 2025 19:20:38 GMT

Hi beyercj,

Thanks for reaching out to our community.

I understand that your Nest Learning Thermostat 4th gen was showing the error code N4156. While you couldn't find this code on the support page, you correctly identified from the wiring menu that it pointed to an electrical issue on the W1 wire. I appreciate you letting us know that restarting the thermostat resolved the issue.

Akacperski, I would appreciate it if you could confirm that the inconvenience remains resolved for you.

If you need further assistance, please feel free to contact us.

Best regards,

Virna

Re: Nest Gen4 Invalid Error Codes

EduardoN — Sun, 09 Nov 2025 00:14:11 GMT

Hi @Dan2e,

Thank you very much for contacting this community! I understand that lately you've been receiving error codes like N420 and N416 on your Nest Learning Thermostat (4th gen) after a restart, but you've verified that your previous-generation thermostat works correctly and that the boiler is functional. Don't worry, I'm here to help you!

I'd like to ask you a few questions to confirm some details and provide you with troubleshooting steps:

Could you send me some photos of the error codes that appear on your thermostat or in the app you use to control it?
What type of heating, ventilation, and air conditioning (HVAC) system do you have?
Did you turn the HVAC system off?
Did you recently turn off any breakers?
Have you recently experienced a brownout or blackout?
Do the LED lights blink on the HVAC control board?

Please feel free to share any additional details you think might be relevant.

Best regards,
Eduardo

Re: Nest 4th Gen Thermostat - Error Code N416

Jasonkloess — Sun, 09 Nov 2025 13:48:47 GMT

I just got this same error message. It’s been working fine for months and now isn’t heating. Nothing has changed, we did a soft restart, still no heat

Re: Nest 4th Gen Thermostat - Error Code N416

Kingstja5on — Mon, 10 Nov 2025 03:52:22 GMT

I also recently got this message. It seems to correspond with the recent update.

Re: Nest Gen4 Invalid Error Codes

Dadster — Mon, 10 Nov 2025 14:18:02 GMT

I woke up to the same issue this morning, N 420, only code. Unit has been working for months okay, last night was the first night to cycle completely through the heating cycle. Used heat pump during day, cold enough the alt heat turned on. There is nothing on the Google site except this one post. No wiring changes. I have dual fuel system, HP and propane as alt heat.

Re: Nest 4th Gen Thermostat - Error Code N416

MarkT42 — Mon, 10 Nov 2025 18:27:44 GMT

This started happening to me a few days ago. Found this thread and doing a restart fixed the issue initially, but two days later it’s back. As noted in another comment, the thermostat still seems to be working and heating as scheduled. Not sure where to go next.

Re: Nest Gen4 Invalid Error Codes

MarkT42 — Mon, 10 Nov 2025 18:44:05 GMT

Same issue for me. Code is N416. I restarted the thermostat and the error message went away. Two days later the error message is back. Despite the error code, the thermostat appears to be functioning correctly and heating the space based on the schedule

Re: Nest Gen4 Invalid Error Codes

Jasonkloess — Mon, 10 Nov 2025 19:29:32 GMT

I’ve restarted the thermostat and it’s still showing an error message and not heating. We had an hvac tech come take a look and he said it’s an issue with the thermostat as the hvac works fine if bypassed. No heat and it’s snowing and we paid hundreds for this POS thermostat. Cool cool

Re: Nest Gen4 Invalid Error Codes

Akacperski — Mon, 10 Nov 2025 19:33:28 GMT

This issue seems be a tech glitch that Google needs to address with an update.

Re: Nest 4th Gen Thermostat - Error Code N416

Panda_Bears — Tue, 11 Nov 2025 14:48:15 GMT

Same issue...worked fine, woke up in a freezing house, error code n416. Restarted but nothing. Are we able to uninstall this awful update?

Re: Nest 4th Gen Thermostat - Error Code N416

burntyeti — Tue, 11 Nov 2025 15:56:34 GMT

I just installed the new Google Nest Thermostats v4 last weekend. Everything went great, until we added the heat to it this weekend. Seems to be an issue across the board. I am receiving this N416 and no heat coming through. I can put on the old Nest Thermostat v2 and I have heat again. What's up Google?

Re: Nest 4th Gen Thermostat - Error Code N416

ChegGary — Tue, 11 Nov 2025 16:09:28 GMT

having the same issue. installed last week working fine then today N416 error. but only on one of the thermostats

Re: Nest 4th Gen Thermostat - Error Code N416

burntyeti — Tue, 11 Nov 2025 16:12:45 GMT

I will also note, it's only one of the thermostat (upstairs). Downstairs working flawlessly and keeping us warm, for now.

Re: Nest 4th Gen Thermostat - Error Code N416

irate4x4 — Tue, 11 Nov 2025 20:10:07 GMT

Google nixed support for Gen2 Nest a few weeks ago
My Gen2 started blowing fuses on the furnace’s control board this week
Bought & Installed a Gen4 2hr ago
No Heat, n416 error
Unit says read https://g.co/nest/n416
URL is broke
Software auto updated to v2.3-2
Did a factory reset
It maintained v2.3-2

Its going to be in the 20s again tonight.

Bang Up Job Google!