ecobee Offline or Keeps Going Offline: ecobee’s Own Fix, in Order

The Short Answer

First, your heating and cooling still work. ecobee says that even without Wi-Fi the thermostat will still function as a traditional thermostat: it runs your equipment and maintains your set points. What you lose is the app, voice assistants and weather data.

ecobee’s fix depends on which problem you have:

If It Is Offline Right Now

These are the steps in ecobee’s Wi-Fi troubleshooting article, in its order:

1. Reboot the router. Restart the router and any extenders, and wait until another device is back online.
2. Reboot the thermostat. Pull it straight off the wall plate, leave it off for 30 seconds, and put it back.
3. Reconnect to Wi-Fi. On the thermostat go to Main Menu → General → Settings → WiFi and select your network. On the Smart Thermostat Lite and Essential the path is Main Menu → Settings → WiFi.
4. Note any error. ecobee asks you to write down the error and where in the countdown it appears. Support will want it.
5. Test with a phone hotspot. If the thermostat connects to your phone’s hotspot, ecobee says the issue is probably in your home network settings. On an iPhone, turn on Maximize Compatibility, and remove special characters from the phone’s name. Reboot the thermostat for 30 seconds after switching the hotspot on.
6. Still nothing? ecobee says to contact its support team.

If It Keeps Disconnecting

ecobee’s list for a thermostat that connects and then drops:

1. Check the signal strength. Go to Main Menu → General → About → WiFi (Lite and Essential: Main Menu → About → WiFi). ecobee says a signal below 75% could be causing connection issues, and suggests moving the router closer or adding a Wi-Fi extender.
2. Use the 2.4 GHz band. On a dual-band router, connect the thermostat to 2.4 GHz. ecobee says only the Smart Thermostat Premium, Smart Thermostat Enhanced and SmartThermostat with voice control are 5 GHz compatible.
3. Turn off band steering. ecobee says to disable band steering and split the network bands. With several access points, it suggests a separate 2.4 GHz network with its own name.
4. Disable MAC filtering and lower the firewall strength.
5. Check the encryption. It should be WPA/WPA2 with AES. ecobee does not support TKIP.

Router menus differ, so ecobee points you to the router manual or your internet provider for where these settings live. You do not need to open any ports: ecobee says the thermostat makes its own outgoing encrypted connection and accepts no incoming ones.

Do Not Reset It for This

A factory reset feels like the obvious next step, but ecobee advises against it: for heating, cooling or internet connectivity problems, a Reset All will not resolve this in most cases. It also erases your equipment settings, and ecobee warns a technician may be needed to set them up again. The reboot above (off the wall for 30 seconds) loses nothing.

When Offline Is Really a Power Problem

If the thermostat drops offline when heating or cooling starts, or you have seen the screen go black or restart, look at power before Wi-Fi. ecobee explains that the thermostat has no battery, and that interruptions to its 24 VAC supply can make it go black or reboot during heating or cooling calls. The causes it lists are a tripped high-limit switch (often a clogged filter), a float switch tripped by a blocked condensate drain, and a transformer that is too small for the system.

For the wiring side, ecobee says to make sure the C wire is securely connected to the C connector, or to use the Power Extender Kit if there is no spare wire. More in ecobee calibrating or rebooting.

Is It ecobee, Not You?

If the thermostat shows it is connected to your router but the app still cannot reach it, check status.ecobee.com, ecobee’s service status page, before changing anything. The thermostat’s own About → WiFi screen shows the connection to the router and to ecobee’s server separately.

When to Contact ecobee

After the router reboot, the thermostat reboot and the hotspot test have all failed, ecobee says to contact support, with the error and countdown position you noted. Its contact page lists phone support at 1-877-932-6233 in North America.

Frequently Asked Questions

Why does my ecobee say offline?

The thermostat cannot reach ecobee's servers, usually because of the home Wi-Fi. ecobee's steps are to reboot the router, reboot the thermostat by taking it off the wall for 30 seconds, reconnect to Wi-Fi, and then test with a phone hotspot.

Does an ecobee still work when it is offline?

Yes. ecobee says that without Wi-Fi it still works as a traditional thermostat, running your equipment and keeping your set points. You lose the app, voice assistants and weather data.

Does ecobee work on 5 GHz Wi-Fi?

Only the Smart Thermostat Premium, Smart Thermostat Enhanced and SmartThermostat with voice control, according to ecobee. Other models need a 2.4 GHz network.

How do I reboot an ecobee thermostat?

Pull it straight off the wall plate, leave it off for 30 seconds and put it back. This does not erase any settings.

Will resetting my ecobee fix Wi-Fi problems?

ecobee says a Reset All will not resolve internet connectivity issues in most cases, and it erases your equipment settings.

What Wi-Fi signal strength does an ecobee need?

ecobee says a signal below 75% could cause connection issues. Check it under Main Menu, General, About, WiFi.

Related Guides

• ecobee screen black or blank — when it has no power
• ecobee calibrating or rebooting — the power-loss version of this problem
• ecobee not heating or cooling — when it is online but nothing runs
• Smart thermostat troubleshooting — every fix guide by symptom

Sources

• ecobee support: Troubleshooting Wi-Fi connectivity
• ecobee support: Set up or change your Wi-Fi connection
• ecobee support: Resetting your ecobee thermostat
• ecobee support: Why is my ecobee thermostat rebooting?
• ecobee support: troubleshoot thermostat power issues
• ecobee service status
• ecobee: contact support