Google Nest Thermostat Offline and Wi-Fi Troubleshooting
When a Nest thermostat goes offline it can’t reach your Wi-Fi, so the Google Home app can’t control it. The thermostat itself still heats and cools your home, and you can still change the temperature on the device. Google’s steps differ a little by model, so this guide notes where the Nest Learning Thermostat (4th gen), Nest Thermostat, Nest Thermostat E and older Learning models differ. Most steps need you at home, next to the thermostat and router (Google Nest Help: Troubleshoot your offline Nest thermostat).
Is this the right guide? This guide covers Google Nest Thermostat-specific steps. If every device in your home is losing Wi-Fi, not just this one, start with Why Does My Wi-Fi Keep Disconnecting?.
Affiliate disclosure: As an Amazon Associate, Everyday Tech Guide earns from qualifying purchases. This page contains labeled affiliate links; we may earn a commission if you purchase through them, at no additional cost to you. Our picks are not paid placements.
Quick answers
- Changed your router or Wi-Fi password? Either use the same network name and password as before, or reset the thermostat’s network settings and reconnect it (Google Nest Help: Troubleshoot your offline Nest thermostat).
- Shows connected on the thermostat but offline in the app? Check your phone’s own connection, restart the router and the thermostat, and update or reinstall the Google Home app (Google Nest Help: Troubleshoot your offline Nest thermostat).
- Low battery? A low battery can stop a Nest thermostat from reconnecting, so check it first (Google Nest Help: Troubleshoot your offline Nest thermostat).
- Weak signal? Google says a signal strength under 50 is weak. Move the router closer or try a Wi-Fi extender (Google Nest Help: Troubleshoot your offline Nest thermostat).
- W5 on the screen? Restart the thermostat. If W5 stays, Google says it may be a hardware fault that needs a replacement (Google Nest Help: Troubleshoot a Nest thermostat W5 code).
Check the connection on the thermostat
| Model | Where to look | What “working” looks like |
|---|---|---|
| Nest Thermostat, Nest Learning Thermostat (4th gen) | Settings, then Network, then Nest Server | “Connected. Can control the thermostat from the app.” |
| Nest Thermostat E, Nest Learning Thermostat (3rd gen) | Settings, then Technical Info, then Nest Weave | “Connected. Remote control available.” |
If the thermostat shows offline both on the device and in the app, restart it first. Removing it from the Google Home app and resetting it is the last resort, because a reset clears schedules and settings (Google Nest Help: Troubleshoot your offline Nest thermostat).
Google’s offline fix, step by step
Google’s offline article works through these steps in order. If you changed your router or Wi-Fi password, skip straight to the network reset in step 9 (Google Nest Help: Troubleshoot your offline Nest thermostat).
- Check the battery. On the 4th gen Learning model a dark yellow light means low battery, or check Settings, Equipment, Power info. On the Nest Thermostat check Settings, Battery and replace the batteries if it says Very low. On the Thermostat E and 3rd gen Learning models check Settings, Technical Info, Power: Google says it needs 3.8 V and won’t reconnect below 3.6 V.
- Look for a message or help code on the display. Codes come with a g.co/nest web address that explains the fix.
- Update the Google Home app (or the Nest app on older models).
- Check your home Wi-Fi with another device. Turn on Airplane mode on a phone, then turn Wi-Fi back on so you aren’t testing over mobile data. If nothing connects, contact your internet provider.
- Restart the modem and router. Unplug both, wait 30 seconds, plug in the router and any access points, wait about a minute, then plug in the modem and wait about 2 minutes. Restart any extenders too.
- Restart the thermostat from its Settings menu (Settings, Restart on newer models; Settings, Reset, Restart on ring models).
- Check signal strength and ping in Settings, Network (or Technical Info, Network on older models).
- Try a phone hotspot as a temporary network. If the thermostat works on the hotspot, your home network settings are the likely cause.
- Reset the Wi-Fi connection. Settings, Reset, Network, Reset, then choose your network, enter the password and reconnect the thermostat to the app.
- Check router settings, firewalls and parental controls (next section).
Signal strength, ping and interference
Google’s numbers (Google Nest Help: Troubleshoot your offline Nest thermostat):
- Signal strength under 50 is weak.
- Ping should be under 1500 ms on older models. If ping is over 1000 or signal is under 50, turn off nearby 2.4 GHz devices and check again.
- A ping of 0 means the thermostat is on Wi-Fi but can’t reach Nest’s servers, usually because of a router firewall or other network setting.
- Devices Google lists as possible interference: cordless phones, baby monitors, microwaves, Bluetooth devices and wireless video equipment.
- Because the thermostat can’t move, try moving the router a few feet left or right, and keep it out of cabinets full of electronics.
If the signal stays weak, Google suggests moving the router closer or trying a Wi-Fi extender (Google Nest Help: Troubleshoot your offline Nest thermostat).
Router settings Google recommends
If the thermostat still won’t stay connected, Google suggests these router changes (Google Nest Help: Troubleshoot your offline Nest thermostat):
- Temporarily lower strict firewall or parental control settings to see if they block Nest’s servers, then add an exemption.
- Enable 802.11 b/g/n if you have an 802.11ac router.
- Set the DHCP lease time to at least 2 hours.
- Turn on the router’s Power Save Mode (PSM).
- Update the router’s firmware. Google notes that older routers are sometimes incompatible with Nest products.
- If reconnecting fails, try turning off Wi-Fi range extenders on the network.
W5 help code
W5 means the thermostat can’t connect to Wi-Fi and may point to a hardware fault (Google Nest Help: Troubleshoot a Nest thermostat W5 code):
- Check for it in Settings, Network. “Error - nest.com/w5” is the W5 code. Your network name or “Not connected” is not W5.
- Restart the thermostat from Settings, Reset, Restart.
- Reconnect from Settings, Network.
- If W5 comes back, contact Google Nest support with the help code and the serial number from the back of the display.
Products mentioned in this guide
Details come from TP-Link’s product page and the Amazon listing. When we checked on October 24, 2026, the extender was in stock new, sold and shipped by Amazon.com.
TP-Link RE315 (AC1200 Wi-Fi extender)
A basic dual-band extender with a 2.4 GHz band, for when the thermostat’s signal strength reads under 50 and moving the router isn’t practical, which Google suggests (Google Nest Help: Troubleshoot your offline Nest thermostat). It also has Access Point mode for a wired connection back to the router (TP-Link: RE315 product page).
View the TP-Link RE315 extender on Amazon (affiliate link) →
We have not independently tested this product. Availability, specifications and platform support can change; confirm the details on the product listing and the manufacturer's site.
Frequently asked questions
Why does my Nest thermostat say offline?
It can’t reach your Wi-Fi or Nest’s servers. Common causes are a low battery, a changed router or password, weak signal, interference, or router firewall settings.
Does a Nest thermostat still work when it’s offline?
Yes. It keeps controlling your heating and cooling and you can change the temperature on the device. You just can’t use the app or some features until it reconnects.
I got a new router. How do I reconnect my Nest thermostat?
Either give the new router the same network name and password as the old one, or go to Settings, Reset, Network on the thermostat and choose the new network.
What signal strength does a Nest thermostat need?
Google says a signal strength under 50 is weak. Move the router closer, remove interference, or try a Wi-Fi extender.
What does a ping of 0 mean on a Nest thermostat?
It’s on Wi-Fi but can’t talk to Nest’s servers, usually because of a router firewall or other network setting.
What is the W5 error on a Nest thermostat?
It means the thermostat can’t connect to Wi-Fi. Restart it; if W5 stays, Google says it may need replacing and to contact support.
Does restarting a Nest thermostat erase the schedule?
Google lists a restart as a separate step from a reset. A full reset is the one that erases schedules and settings, so it comes last.
Which router settings help a Nest thermostat stay connected?
Google suggests enabling 802.11 b/g/n, a DHCP lease of at least 2 hours, Power Save Mode on, current firmware, and exemptions for strict firewalls or parental controls.