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The recurrent interruption of Wi-Fi connection on a Honeywell thermostat can be exasperating. This issue typically arises when the Wi-Fi signal is disconnected or it doesn't have adequate strength.

Whatever the case, there are several ways to fix a thermostat that displays an “Offline” or “No signal” error, so let’s get into it. 

Step 1: Check Wi-Fi Signal Strength

Weak Wi-Fi signals are the primary cause of connectivity issues in smart thermostats, so by improving the signal can make a world of difference.

To see if this is the case, check the signal strength using the Wi-Fi signal bars indicator on your smartphone or smart device. 

If your smartphone shows low Wi-Fi signals when near the thermostat, your thermostat is also struggling to maintain a strong connection. (Perhaps even more so since the Wi-Fi module in the thermostat is not as powerful or far-reaching as the one in your smartphone).

In that case, you can try to reposition your router; the closer the better. 

Beyond that, you can use Wi-Fi extenders, or consider setting up a mesh system to cover any Wi-Fi dead zones in your home. 

Step 2: Check for Internet Connectivity

See if your Wi-Fi network allows you to access the internet. Simply log in to the network using your smartphone and try carrying out an instant speed test

If your Wi-Fi router can’t connect to the internet, contact your ISP for assistance. 

Low Wi Fi indicator
Perform a quick speed test to see if your router can connect to the internet

Step 3: Reset the Router

Sometimes, the router might be needing a soft reset. In that case, try turning off your router for five minutes, then turn it back on.

If the issue persists, try contacting your internet service provider or performing a factory reset on the Wi-Fi router.

However, this will remove all the connected devices and you may have to reconnect them with the default password found at the back of the router.

Step 4: Check Wi-Fi Router Settings

Verify your router settings. These include:

  • Using the correct passwords and Wi-Fi names/IDs
  • Running on the 2.4GHz band with “band steering” disabled
  • Running on the WPA2-AES Network Security Protocol
  • DHCP Enabled – Not running as a static network
  • UPnP/P2P is enabled
  • The network doesn’t run through a web/page login or portal
  • The network is not a Business/Enterprise or guest network

Honeywell thermostats can’t connect to their servers if these router settings are not met. So make sure to configure your router or get help from your ISP. 

Also, to troubleshoot additional Wi-Fi router settings, check out this article. 

Step 5: Try Reconnecting the Thermostat to Wi-Fi

After confirming the router settings and its ability to connect to the internet, reconnect the thermostat to your Wi-Fi.

Depending on the model, you might have to perform a Wi-Fi reset, unlink from the app or simply forget the network and reconnect through the thermostat itself. 

Check out this guide for model-specific guides on how to reconnect your thermostat.

Step 6: Use a Mobile Hotspot

If the Wi-Fi router can’t connect to the internet or provide a strong enough signal to the thermostat, you can try connecting the thermostat to a mobile hotspot.

This step can help you rule out the router until you wait for the ISP to fix things up or until you figure out how to improve the signal strength of your home’s Wi-Fi network.

Simply set up a hotspot using your smartphone and connect your thermostat to the hotspot. After that, open the mobile app and see if the remote functions are working.

Use a Wi-Fi hotspot device or your smartphone

Step 7: Force Close and Reinstall the App

Sometimes the app can be buggy and cause delays. In that case, try force-closing the app on your smart device.

Beyond that, you can try: 

  1. Updating the app and thermostat firmware to the latest versions
  2. Re-installing the app
  3. Restarting your smart device

Step 8: Check for Server Maintenance

You can also check if the Honeywell servers are undergoing maintenance through their homepage or web portal. If this is the case, try waiting it out for an hour or two and reconnecting the thermostat.

I also recommended checking DownDetector or Twitter as when a company has an outage, it's usually widely reported.

Step 9: Verify Wi-Fi is Enabled on the Thermostat

In recent models, there’s the option to disable the Wi-Fi, so make sure this setting is enabled. 

In most models, you can find this setting in the “Wi-Fi” option in the thermostat menu.

Make sure the Wi-Fi is enabled in your thermostat

Step 10: Power Cycle the Thermostat

To fix any power issues or glitches within the thermostat, you can try power cycling/soft-restarting the thermostat.

Simply take it out of the wall mount and remove the batteries for a couple of minutes. Then plug everything back in and see if the thermostat reconnects to the Wi-Fi.

Other Troubleshooting Tips

If none of the above 10 work, here are some other ideas on what might be causing the problem.

  • Check for Firmware Updates: Your thermostat may be offline or showing “no signal” if it's running outdated firmware. Honeywell regularly releases updates to improve functionality and fix bugs. You can check for firmware updates through the Honeywell app or website.
  • Verify Thermostat Placement: Ensure your thermostat is placed correctly. It should be in a central location, away from direct sunlight, drafts, furniture, doors, and windows. The thermostat's Wi-Fi reception can be affected if it's located too far from the router or if there are many physical obstructions.
  • Inspect for Physical Damage: Check your thermostat for any signs of physical damage that could be causing it to malfunction. This could be anything from a broken display to damage from a power surge.
  • Check Power Source: Verify that the thermostat is receiving power correctly. If your thermostat uses batteries, make sure they are not drained. If your thermostat is hardwired, make sure there isn't a problem with your electricity supply from the HVAC system.
  • Reset the Thermostat: Sometimes, resetting the device can help resolve issues. This should be done as a last resort as it will delete all your customized settings.

Final Step: Replace or Contact a Professional

If all else fails, consider replacing the thermostat or contacting a professional for assistance. If the thermostat is still under warranty, it's definitely worth following up with the retailer or Honeywell directly.


From low signal strength to a router with the wrong settings, the reasons why a Honeywell thermostat shows offline can often be trivial or extremely complicated.

Whatever the case, these troubleshooting steps will help you fix the issue or at least figure out which component is to blame. 

So make sure to read through the guide and drop a comment if you have any questions.

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