topic Re: Nest Thermostat 3rd Generation pin code in Nest Thermostats

Nest Thermostat 3rd Generation pin code

mcd1 — Wed, 27 Aug 2025 19:42:19 GMT

Hi,

I've got myself into a bit of a mess here. I have changed my Wi-Fi network and when i came to change the network on my Thermostat, it is asking for my 4 digit pin code. I don't know this pin code.

I have tried to find the pin code on the NEST app but it is not shown. I do not have the Thermostat set up on Google Home.

I have tried resetting the stat by holding down for 10 seconds, but when it reboots, i still have the same problem.

I have tried to remove the thermostat from the App and to reinstall as a new device, but it still wants the 4 digit code.

Any ideas would be much appreicated.

Re: Nest Thermostat 3rd Generation pin code

CoolingWizard — Thu, 28 Aug 2025 00:38:45 GMT

@mcd1 , when you first installed your nest thermostat you were asked to set a four digit pin code and that’s a lock pin code. Anytime you locked the nest thermostat asked for a pin code. So just think back to the last time you locked it and that’s the pin code you used.

Re: Nest Thermostat 3rd Generation pin code

mcd1 — Thu, 28 Aug 2025 19:39:40 GMT

This is the problem….. I don’t know the code that was put in.

Re: Nest Thermostat 3rd Generation pin code

CoolingWizard — Sat, 30 Aug 2025 01:37:25 GMT

@mcd1 , whom set up the Google Nest Thermostat for you? Did you buy it used from the previous owner?

The AC Cooling Wizard

Re: Nest Thermostat 3rd Generation pin code

ByronP — Sat, 30 Aug 2025 17:16:43 GMT

Hi mcd1,

Thank you for posting in the community. I’m sorry to hear you’re experiencing trouble unlocking your Nest Learning Thermostat (3rd gen) since you’ve changed your WiFi network. I understand how frustrating it must be to be asked for a 4-digit PIN code. I appreciate all your troubleshooting efforts in this situation and for your help, @CoolingWizard. No worries. I’m here to assist you.

The team would like to learn more about this situation. When you get a chance, please fill out this form and let us know when you’re finished. We’ll have someone reach out to you via email from there.

Regards,

Byron