This guide is for Honeywell Home T6R-HW owners whose thermostat won’t join Wi-Fi or can’t be reached from the app. The steps follow the T6/T6R user guide from Resideo, which makes Honeywell Home products.

What This Problem Means

The T6R-HW joins your home Wi-Fi so you can control it from the Resideo app. When the connection drops, the thermostat shows an alert such as NO INTERNET or NO WIFI SIGNAL. Resideo says Wi-Fi isn’t required for the T6R to work as a standard programmable thermostat.

Common Symptoms

• NO INTERNET or NO WIFI SIGNAL on the thermostat screen
• WIFI NOT CONFIGURED or REGISTER ONLINE on the thermostat screen
• The Resideo app can’t reach the thermostat
• App setup doesn’t end with a success message on the thermostat

Safe Checks You Can Try

1. Check your Wi-Fi is 2.4GHz and secure

Resideo’s user guide says to ensure your Wi-Fi is secure and set to 2.4GHz. Its installation guide lists the thermostat’s Wi-Fi radio as 2.4GHz.

2. Have your network details ready

Have a note of your home Wi-Fi network name and password, and switch on Wi-Fi on your smartphone or tablet.

3. Add the thermostat in the Resideo app

Download the app from Google Play or the Apple App Store. Resideo’s 2020 user guide calls it the Honeywell Home App; Resideo’s current pages call it the Resideo app (“Resideo – Smart Home” on its GB apps page).

Open the app, press “Create Account” and follow the app instructions.

4. Look for the success message

Once the thermostat is connected to your Wi-Fi network and the app, it briefly displays a success message.

5. Read the alert on the thermostat

If it still won’t connect, check the alert on the screen. NO INTERNET means the internet connection has been lost, so check your internet connection or Wi-Fi router. NO WIFI SIGNAL means the Wi-Fi signal has been lost, so check your Wi-Fi router. WIFI NOT CONFIGURED or REGISTER ONLINE means the thermostat hasn’t been added or registered: download the app, create an account and add your thermostat. The table below has Resideo’s wording.

6. Change network from the app

To disconnect the thermostat or move it to a different network, Resideo’s user guide says to follow the instructions in the app under the menu “Thermostat Configuration”. The thermostat’s own menu also has a Wi-Fi option to set up or change Wi-Fi settings.

7. Reset the Wi-Fi settings

The thermostat’s user menu has a RESET option that can reset the Wi-Fi to factory default settings (it can also reset the schedule or HomeKit). If the thermostat then shows WIFI NOT CONFIGURED, Resideo says to download the app, create an account and add your thermostat, as in step 3.

8. If WIFI RADIO ERROR shows

Resideo says this means the Wi-Fi radio of your thermostat is faulty, and to contact your installer.

T6R-HW Wi-Fi alerts explained

These alerts come from Resideo’s T6/T6R user guide, which covers the wired T6 and the wireless T6R.

When To Contact Support

If none of these steps fix it, contact Resideo, which makes Honeywell Home products, through Resideo’s UK site.