You may need to connect your Honeywell RTH8580WF Wifi Thermostat to a different wireless network than the one it was originally configured with during installation. Perhaps you have changed the name of your home wifi network, or you want to connect the thermostat to a different access point in your home. You can do so by following the procedure below.
This wifi thermostat, during initial setup, actually becomes a wireless access point with its own web site, that you can connect to and administer with a laptop, tablet, or smartphone (equipped with wifi option). Ethernet-based devices cannot be used for this part of setup. You must use some sort of wifi-capable computer device. Now assuming that your thermostat has been installed and is up and running, and connected to a particular wifi network, all that is needed is to change the wireless network name and password through which it connects to the Internet. All other non network-related settings need not be modified.
The picture above shows the thermostat, already connected to an in-range wifi network.
Enter Wifi Setup mode.
Switch from normal to Wifi setup by changing operating parameter 900 from a 1 to a 0. This forces disconnection from the current Wifi network, and starts Wi-Fi Setup. Do this as follows:
Press the System button. See the screen change to the following:
Press and hold the blank square button in the middle (above pic), on the bottom of the screen, until the screen changes to the following. You may have to keep pressing for up to five seconds.
Press the center up and down arrow keys, to advance through the parameters list. Stop when you find code 900. The touchscreen should then appear as follows:
Using the value Up / Down arrow keys (far right above), change the value of parameter 900 from 1 to 0, as pictured next. This forces Wifi disengagement.
Press the DONE button in the lower left corner of the screen. This applies the new setting, and deactivates the current wifi connection. You should then see a status message across the top of the screen indicating this. Wi-Fi Disconnected, as follows:
The above message displays for several seconds, and then, the thermostat goes into the Wi-Fi Setup mode, as pictured next.
You have now accomplished putting the thermostat into Wifi Setup Mode. So proceed to the next step.
Locate the thermostat wifi network on your wifi-capable device.
in Wifi Setup Mode, the RTH8580WF creates its own little wifi network. In this step, you will connect your tablet or other wifi computer device to this network, where you’ll then be guided through selecting the desired new Wifi network, to which you’d like to connect this thermostat. We used an iPad Air tablet to connect, by going to Settings->Wifi. The screen we saw on the tablet follows.
Connect to the Thermostat Wifi Network.
Next, use the procedures supported by your computer / tablet / phone to connect to this network. In this case, the wifi network is called NewThermostat 277279. This is an open wireless network, so no password is required. Have no security fears though, because this thermostat-generated network disappears once you’ve finished Wi-Fi Setup.
Once you connect, your device should automatically display the following network selection page, after several seconds. This is the list of available wifi connections to your thermostat; the ones that are in range of it; the ones that it “sees.”
Select the Desired Network.
On the above screen, pick the desired network by tapping the area above it or clicking it with the mouse. In our case, we’re choosing the 937T681J4059H SSID to connect with. The system then prompts you for the password of the network you chose, as pictured next.
Enter the New Network’s key / password.
Upon correct entry of the correct network password, the RTH8580WF turns off its own Wifi network (the “NewThermostat 277279” network), and then connects to the one you’ve specified. The network selection window on your tablet / computer should disappear within a couple seconds of this occurring, and on the RTH8580WF touchscreen, a “Connecting…” message is then displayed as follows:
It can take up to thirty second for the new connection to form, so be patient.
At any rate, once it does, another message displays in the touchscreen status area, that alternates between “Connection successful,” and “Joined network” as follows:
Eventually, after one to three minutes, and if no errors connecting to the Internet were encountered, the RTH8580WF exits Wifi Setup mode, and returns to normal operation mode as displayed below. The text disappears from the blue-encircled space illustrated in the above picture, and the Wifi signal strength meter appears as depicted in the picture below. If you see this, then you’ve done everything right, and the thermostat is now communicating through the Internet with the Honeywell smart thermostat management servers. Congratulations! You’ve successfully changed / updated the thermostat’s network settings.
Check the documentation that came with your thermostat for what to do next. You’ll now be able to access and control your thermostat remotely, via the web. See our Honeywell Programmable Wifi Thermostat Review for more details.
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- Factory Default Reset Honeywell WiFi Thermostat RTH8580WF
- Setting Temperature Differential on Honeywell WiFi Thermostat RTH8580WF
- RTH8580WF Wireless Thermostat Product Page
- Where to buy the Honeywell RTH8580WF Programmable Thermostat
- 2017-01-25: Updated tags list.
- 2015-10-04: Added appropriate tags.
- 2015-09-05: Added the Suggested Reading section.
- 2014-12-02: Originally published.