Nest thermostat is offline

 If your thermostat’s battery level is low, it'll disconnect from Wi-Fi. It does this to conserve power, so it can continue to control your system. If your thermostat repeatedly loses battery charge, it may require a C wire or the Nest Power Connector.

	Nest Learning Thermostat (4th gen) When the battery is low, it displays a dark yellow light. To check the battery level, on your thermostat, select Einstellungen   Equipment  Power info. If the battery state is low, there might be a power issue that causes your thermostat to disconnect. Note: If after you charge the thermostat and don't solve the issue, go to Troubleshoot when your thermostat won’t turn on for more help.
	Nest Thermostat The Nest Thermostat lets you know when the battery level is getting low, but you can manually check it any time. To check the battery level, on your thermostat, open the Menu view  select Einstellungen   Battery . The icon changes depending on charge level. If the status says “Very low,” replace the batteries with new ones. Then, check if your thermostat reconnects. It may take a few moments. Note: If low battery is a recurring issue or if you think there may be an issue with wiring, check Troubleshoot when your thermostat won’t turn on for more help.
	Nest Thermostat E or Nest Learning Thermostat (3rd gen or earlier) To check the battery level, on your thermostat, open the Quick View menu select Einstellungen   Technical Info  Power. Find the number labeled “Battery". If it’s 3.8V or higher, your thermostat isn't disconnected because of a low battery. If it’s below 3.6V, there might be a power issue that causes your thermostat to disconnect. Check Troubleshoot when your thermostat won’t turn on for more help. If the battery has recently drained past 3.6 volts, it won’t reconnect until it’s reached 3.8 volts.

Sometimes, your thermostat tells you what’s happening. Here are some messages and help codes you might find:

• Install power wire: If this message appears, it means your thermostat doesn’t get enough consistent power to stay connected to Wi-Fi. To resolve this issue, you need to connect the Nest Power Connector or a C wire.
• E448, E298, E73, E74 or E196 help codes: If one of these codes appears, it means your thermostat isn’t getting any power. For help, refer to troubleshoot Nest thermostat help codes.
• W5 help code: If this help code appears, it means your Nest thermostat can't connect to Wi-Fi. For help, refer to Troubleshoot a Nest thermostat W5 code.

Check to verify if you can get online with a different device at home. If you’re using a cellphone, turn on Airplane mode and then turn on Wi-Fi to make sure you don’t use cellular data to test your connection.

If you can’t connect, use another device to verify. If no device connects, contact your Internet Service Provider (ISP) to check the service status.

When you restart your router, it resets your internet connection. You should also restart any Wi-Fi range extenders or repeaters.

1. Unplug your modem and router power cords. You may have a modem and router combo or they may be separate devices. All the lights on your modem and router should be off.
2. Wait for 30 seconds, then plug in your router and access points. Wait about a minute for them to finish starting up, then plug in your modem.
3. Wait a couple of minutes or until there’s steady power and connection lights. A quickly flashing data light may also appear.

When you restart your thermostat, it refreshes your connection.

	Nest Learning Thermostat (4th gen) On your thermostat, press the display to open the menu view turn the dial to Einstellungen  Restart . Your thermostat will take a few minutes to restart.
	Nest Thermostat On your thermostat, open the Menu view  select Einstellungen   Restart  Restart Yes to confirm.
	Nest Thermostat E or Nest Learning Thermostat (3rd gen or earlier)  On your thermostat, press the thermostat ring to open the Quick View menu  select Einstellungen   Zurücksetzen  Restart  turn the ring until you can select Ok.

 Check the Wi-Fi signal strength and ping speed of your Nest thermostat to help determine if interference is what prevents your thermostat from connecting. Interference is typically intermittent, so your thermostat can disconnect and reconnect to Wi-Fi repeatedly if this is the root cause.

Check thermostat connection strength

Nest Thermostat or Nest Learning Thermostat (4th gen)

On your thermostat, go to Einstellungen   Network. The connection status (Connected or Disconnected) and the signal strength should appear.

Nest Thermostat E or Nest Learning Thermostat (3rd gen or earlier)

On your thermostat, press the ring to open the Quick View menu  select Einstellungen    Technical Info  Network. Check for 2 numbers: ping speed and signal strength. If the ping isn’t available, you can check the Nest weave connection instead.

Note: If you get “Client not connected” on this menu, you should check for sources of interference below.

• Ping: Ping shows how long it takes for messages from your thermostat to travel to Nest servers and back. Ping speed should be lower than 1500 ms. To try to improve your connection, remove sources of Wi-Fi interference below.
  Important: If the ping speed is 0, the Nest thermostat is connected to the network but not communicating with our servers, usually due to router firewalls or other network settings. Continue to step 10 for more information about router settings.
• Signal strength: Signal strength is a 100-point scale. Anything less than 50 indicates a weak connection.

Check the Nest weave connection (certain thermostats only)

On your thermostat, open the Quick view menu Einstellungen Technical Info Nest Weave. Then, check the status.

If the status says “Connected - Remove control unavailable,” there may be an issue with the Nest service.

If the status says “Not connected,” there may be an issue with the router or network.

Check for sources for Wi-Fi interference

If your thermostat’s ping is above 1000 or its signal strength is below 50, turn off any devices that operate on a 2.4 GHz frequency, then check the ping and signal strength again. Here are some devices that might cause problems:

• Cordless phones
• Baby monitors
• Microwaves
• Bluetooth devices
• Wireless video equipment

The placement of your router may also cause interference. Since the thermostat is stationary, try moving your router a few feet to the right or left.

If your router is placed in an area with other electronics, like inside an entertainment center, the devices near it could interfere with the connection to your thermostat.

For more information and steps to take to troubleshoot wireless interference, refer to troubleshoot wireless interference.

If the thermostat and the network it’s connected to aren’t compatible, it might cause the thermostat to disconnect or go offline.

Temporarily connect your thermostat to a mobile hotspot to check how the thermostat behaves when connected to a different network. To do this step, you need a mobile device that can be used as a mobile hotspot.

1. In your mobile device’s settings, turn on mobile hotspot.
   Important: You need the hotspot name and password to connect to the hotspot. Make sure you have them available.
2. Find the steps on how to reset your thermostat’s Wi-Fi connection below, and then connect to the hotspot.

 Nest Learning Thermostat (4th gen)

1. Open the Google Home app .
2. Tippen Sie auf Favorites oder Devices .
3. Touch and hold your thermostat's tile.
4. Tippen Sie auf Einstellungen .
5. Tippen Sie auf Device information Wi-Fi.
6. Follow the instructions in the app to connect your thermostat to the Wi-Fi network.

Nest Thermostat

Nest Thermostat E or Nest Learning Thermostat (3rd gen or earlier)

1. Reset the network

1. On your thermostat, open the Quick View menu.
2. Select Einstellungen   Zurücksetzen.
3. Select Network and choose Reset. Note: If this option doesn’t appear, continue to step 10.
4. Confirm that you’d like to reset your network settings.

2. Reconnect your thermostat to Wi-Fi

1. On your thermostat, open the Quick View menu.
2. Select Einstellungen   Zurücksetzen.
3. Choose your Wi-Fi network name and enter your password if prompted.
4. If your thermostat still has trouble connecting, go to step 10 and check the settings on your Wi-Fi router or access point. You can also try to disable any range extenders you may have installed for your Wi-Fi network.

3. Reconnect your thermostat to the app

1. On your thermostat, open the Quick View menu.
2. Select Einstellungen   Nest app.
3. Follow the instructions.