Honeywell RTH9580WF Wi-Fi thermostat, displaying a Notification screen, showing that a registration is needed, with the -Wi-Fi Setup- button highlighted.

Reconnecting Honeywell Thermostat RTH9580WF to WiFi Network, How To Instructions




You might need to reconnect your Honeywell RTH9580WF smart thermostat (t-stat) to the internet, by changing a new WiFi network. Perhaps you moved the t-stat, and the WiFi it worked with before went out of range. So in this post, we cover reconnecting Honeywell Thermostat RTH9580WF to WiFi network, and offer how-to, step-by-step instructions to get your thermostat working on the internet again.



Perhaps you have changed the name of your home wifi network. Or perhaps you changed your WiFi network router and didn’t set your new router’s network parameters exactly the same as were the ones on the old router set. Or, you may want to connect the t-stat to a new access point in your home. For all of these situations, you can reconnect the thermostat to WiFi by following the instructions below.

Change WiFi network on Honeywell thermostat RTH9580WF. Picture of the Honeywell RTH9580WF smart t-stat, front view after initial setup. Reconnecting Honeywell thermostat RTH9580WF to WiFi network,
Honeywell RTH9580WF smart t-stat, front view, after initial setup. Reconnecting Honeywell thermostat RTH9580WF to WiFi network,

Reconnecting Honeywell Thermostat RTH9580WF to WiFi Network, How To Instructions

For sure, Honeywell really improved the WiFi setup routine for this smart t-stat. Indeed, you no longer must reconnect to it via a tablet or phone to update the WiFi network settings. But instead, you can now set up the entire WiFi configuration via the RTH9580WF touchscreen menu system. Here’s how to do it.

1. Enter Wifi Setup mode

First of all, switch from normal to Wifi setup as follows. Press the Menu button at the top right of the Home screen, as shown above.

Then, scroll with the arrow keys at right, through the main menu. Stop scrolling when you see the Wi-Fi Setup button, as shown next.

Picture of the Honeywell RTH9580WF WiFi smart t-stat menu, with the WiFi Setup button circled. Reconnecting Honeywell thermostat RTH9580WF to WiFi network,
Honeywell RTH9580WF WiFi smart t-stat menu, WiFi Setup button circled. Reconnecting Honeywell thermostat RTH9580WF to WiFi network,

Next, press the Wi-Fi Setup button, circled in red in the above pic. The WiFi setup screen then displays, as shown next. Note that we have blanked the t-stat MAC address and CRC values, to preserve its anonymity. Also note that normally, this screen shows the status of the connected WiFi network. However here, the OurHouse1 network is not in range (no signal). So we’re going to discard the OurHouse1 information, and replace it with an in-range WiFi network in the following steps.

Picture of the Honeywell RTH9580WF smart t-stat , displaying the WiFi Setup screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Reconnecting Honeywell thermostat RTH9580WF to WiFi network. Honeywell RTH9580WF smart t-stat , displaying the WiFi Setup screen.

2. Disconnect the T-stat from its Current WiFi Network

Then press the Disconnect from Network button. The WiFi Network Disconnect Confirmation screen appears, as follows.

Picture of the Honeywell RTH9580WF smart t-stat , displaying the WiFi Network Disconnect Confirmation prompt screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF smart t-stat, displaying the WiFi Network Disconnect Confirmation prompt screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

Press the green Yes button. After a pause, the system lets you know that it disconnected from the old WiFi network, as shown next.

Picture of the Honeywell RTH9580WF WiFi smart t-stat , displaying the Network Disconnected screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF WiFi smart t-stat , displaying the Network Disconnected screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

Then, press the green OK button in the lower right corner of the screen. After the press, this takes you back to the main menu, as shown next.



3. Find the WiFi Setup Button

From there then, use the UP and DOWN arrow keys to scroll through the menu to the Wi-Fi Setup button.

Picture of the Honeywell RTH9580WF WiFi smart t-stat menu, with the WiFi Setup button circled. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF WiFi smart t-stat menu, with the WiFi Setup button circled. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

4. Tap the WiFi Setup Button

Then, press the red-circled Wi-Fi Setup button. When no network information resides in the t-stat, pressing Wi-Fi Setup initiates a scan for in-range WiFi networks. Then, a brief message displays, indicating that the network scan is in progress. Then, the RTH9580WF lists the in-range WiFi networks it found, on its Select Wi-Fi Network screen, as follows:

Picture of the Honeywell RTH9580WF smart t-stat , showing the Select WiFi Network screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF smart t-stat , showing the Select WiFi Network screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

5. Find your Desired WiFi Network

Then, tap the network in the list to which you wish to connect the smart t-stat. So in our case, we’re connecting to the 937T681J4059H_2G wireless network. The WiFi Password Entry screen then appears, as follows.

Picture of the Honeywell RTH9580WF smart t-stat , showing the WiFi Network Password Entry screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF smart t-stat , showing the WiFi Network Password Entry screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

6. Enter WiFi Password if Asked For

Next, use the displayed virtual keyboard to enter your password. Then, to enter numbers and punctuation characters, press the ?123 key. Why? Because this switches the keyboard to number entry mode.

The password characters appear as you type them. So do this when no non-trusted folks are looking.



7. Connect to the WiFi Network you Picked

When you’ve finished entering the password characters, press the green Done button. This WiFi t-stat then tries to connect to the selected WiFi network. While reconnecting, it displays the following screen while it does so.

Picture of the Honeywell RTH9580WF smart t-stat, displaying the Connecting To WiFi Network screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF smart t-stat, displaying the -Connecting To WiFi Network- screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

Then, if no errors happen, the system reconnects to the selected WiFi network. Then it displays the following screen. It shows the name of the wireless network that the t-stat now connects with.

Honeywell RTH9580WF smart t-stat, showing the WiFi Connection Successful screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF smart t-stat, showing the WiFi Connection Successful screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

8. Register your Honeywell Thermostat Online for Remote Access

Next, press the green OK button. Then, the Register Online for Remote Access screen then displays, as shown next. Now perhaps you already registered your WiFi t-stat. If so, then you need not register it again, so long as you have not unregistered it. Note that reconnecting to a new WiFi network does not unregister the t-stat.

Picture of the Honeywell RTH9580WF smart t-stat, showing the Register Online for Remote Access screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF smart t-stat, showing the Register Online for Remote Access screen. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

Then, press the green Done button. The system then returns to the Wi-Fi Setup screen. But this time, the connected network information appears, as shown in the next shot.

Picture of the Honeywell RTH9580WF smart thermostat, Displaying the WiFi Setup Screen with the network connected successfully. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF smart thermostat, Displaying the WiFi Setup Screen with the network connected successfully. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

Next, press the green Done button. Then, the t-stat takes you back to the main menu, as shown below.

Picture of the Honeywell RTH9580WF WiFi smart t-stat menu, with the WiFi Setup button circled. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF WiFi smart t-stat menu, WiFi Setup button circled. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

Then from there, press the Home button at the top left corner of the Main Menu screen, to return to the Home screen, as shown next.

Picture of the Honeywell RTH9580WF smart t-stat, front view after initial setup. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.
Honeywell RTH9580WF smart t-stat, front view after initial setup. Reconnecting Honeywell thermostat RTH9580WF to WiFi network.

9. Done!

Finally, your Honeywell smart thermostat now links to your new WiFi network. You’ll see that when the outdoor temperature and humidity settings update soon thereafter.  So, you’ve successfully reconnected your Honeywell RTH9580WF wireless thermostat to your new or updated WiFi network.



Suggested Reading

References

Revision History

  • 2018-07-27: First published.