How to Fix Honeywell Thermostat Won’t Turn On: Troubleshooting and Solutions

A Honeywell thermostat that won’t turn on can be a frustrating issue, especially when you’re trying to maintain a comfortable temperature in your home. In this article, we’ll explore several methods to troubleshoot and fix this problem, providing step-by-step instructions to help you get your thermostat up and running again.

Method 1: Power Cycling the Thermostat

One of the simplest ways to resolve a non-responsive thermostat is by power cycling the device. Here’s how to do it:

  • Remove the thermostat’s faceplate from the wall.
  • Wait for 30 seconds.
  • Reattach the faceplate to the wall.

This process can help reset the thermostat and potentially resolve any issues preventing it from turning on.

Method 2: Checking Your WiFi Connection

If your Honeywell thermostat is connected to your home’s WiFi network, it’s essential to ensure that the network is functioning correctly. Follow these steps to check your WiFi connection:

  • Make sure your WiFi network is working. If necessary, restart your router.
  • Log out and log back into the Resideo application on your mobile device.
  • Restart the thermostat by unplugging it or removing it from the wall plate for 30 seconds.

If these steps don’t resolve the issue, you may need to reconnect the thermostat to the internet by following the instructions in the next method.

Method 3: Reconnecting the Thermostat to the Internet

In the event that your thermostat is not connected to the internet or is offline, you will need to restore its connection. Follow these steps to reconnect it:

  • Firstly, disable mobile data on your mobile device and establish a connection with your home WiFi network.
  • Ensure that you have forgotten any other WiFi networks in proximity. An alternative approach is to activate Airplane mode.
  • Proceed to register and connect the thermostat to a mobile hotspot. By doing so, the necessary registration data will bypass any network security that may be hindering the establishment of a connection.
  • After a successful registration, initiate a WiFi Reset to seamlessly switch the thermostat to your home WiFi network.

Method 4: Resetting the WiFi Connection on Your Honeywell Thermostat

If your thermostat is still not turning on, you may need to reset the WiFi connection. Follow these steps to reset the connection:

  • Locate the “Menu” button on your thermostat’s screen and press it.
  • Scroll through the options until you find “WiFi Setup” or “WiFi Reset” and select it.
  • Follow the on-screen instructions to reset the WiFi connection.

After resetting the WiFi connection, your thermostat should reconnect to your home network and hopefully turn on.

Method 5: Contacting Honeywell Support

If none of the methods above resolve the issue, it’s time to contact Honeywell Support for further assistance. They can help diagnose the problem and provide additional troubleshooting steps or recommend a replacement if necessary.

A Honeywell thermostat that won’t turn on can be a frustrating issue, but with the troubleshooting methods provided in this article, you should be able to identify and resolve the problem. Remember to follow each method step by step and, if necessary, reach out to Honeywell Support for additional help.


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