Locate any unconnected wire labeled W or W1. If in the previous step you identified an O, B, or O/B wire that’s
connecting to the O/B terminal, and have a separate W wire, place this wire into the W2 terminal. If you do not have
a wire connected to the O/B terminal, connect the W wire to the W terminal.
How do I reset the WiFi on my T5, T5+, or T6 Pro WiFi?
If your thermostat was previously connected and has lost Wi-Fi connection, and no changes have been made to your
home network / router, attempt the following first before completing a full wi-fi reset:
A full Wi-Fi Reset can be performed one of two ways:
When registered with the Honeywell Home app – Login, select the thermostat, then select the settings icon in
the top-right corner. The “Reset Wi-Fi” option is located at the bottom of the screen. Follow the prompts in the
app to reconnect, or to connect your thermostat to another Wi-Fi signal.
Add a New Device – If your thermostat was connected and operating normally, but now is not appearing in the
Honeywell Home app under your account, or you are unable to access the “Reset Wi-Fi” button. Select the
“Add a New Device” button, or press the “+” button within the Honeywell Home app. Follow the prompts to
connect and configure your thermostat.
Why can’t I register my T5, T5+, or T6 Pro WiFi to my account?
Registration occurs during the initial pairing with the Honeywell Home app. If you receive an error message stating
that the thermostat is already registered, you can contact the previous owner of the thermostat and ask that they
delete the thermostat from their account, or contact Resideo Customer Care to unregister the device. (Please have
the model number and MAC ID [inscribed on the back of the thermostat faceplate] to expedite the process.)
*If you receive a different error during the connection / registration process, please see the When setting up my T5 /
T5+, why can’t I connect to my Wi-Fi? Support article for more information.
When setting up my T5 / T5+, why can’t I connect to my Wi-Fi?
If you are unable to complete the setup/connection/registration process, attempt the following before
reattempting:
Power cycle the thermostat by removing it from the wall for 30 seconds. Reattach the face plate.
Turn off mobile/ cellular data on your mobile device and connect to your home Wi-Fi network. “Forget” any other Wi-
Fi networks in range. (Turning on Airplane mode is also an option)
Some Android phones have an updated security feature that may not allow your phone to connect to “unsecured” Wi-
Fi networks. Temporarily disable this feature via Settings – Network & Internet – Wi-Fi – Wi-Fi Preferences on your
mobile device.
Attempt to connect and register the thermostat to a mobile hotspot. This allows the registration data to bypass any
network security that may be causing the connection failure. Once successfully registered, a Wi-Fi Reset can be
performed to move the thermostat to the home Wi-Fi network.
Advanced Steps:
If you experience inability to connect, failure to register, or frequent Wi-Fi signal loss, verify the following:
*You may need assistance from your Internet Service Provider to verify/ change some settings*
Setup a 2.4GHz Bandwidth Only network with separate SSID (Not compatible with 5GHz networks.
Simultaneous 2.4 and 5GHz networks that share a name or SSID are not recommended and can cause
thermostat to lose connectivity).
Connect directly to the router signal – Not recommended for use with signal booster, satellites, or extenders.
Business Networks (Enterprise networks, guest networks, or networks that require logging in via a web
page/portal) are not supported.
Gateways or Network switches can block some traffic to Honeywell and are not supported.
Recommended WPA2-AES Network Security Protocol
DHCP Enabled – Static networks not supported
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