Thermostat wont connect to my nest app

[epeters6677]

My replacement thermostat arrived but it wont connect to my nest app. It keeps sayin td009. We never had any issues until two weeks ago

[zoeuvre]

Hi epeters6677, 

Uh-oh! I'm sorry to hear that your thermostat can't connect to your Nest app. Follow these: 

1. Reset the joining device to default.
2. Restart the modem and router.
3. Move all devices being used for pairing closer to the router.
4. Check the network settings.

Let us know how it goes.

Best,

Zoe