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Wiring Honeywell RTH9580WF Smart Thermostat

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  • Wiring Honeywell RTH9580WF Smart Thermostat

    Initially, my Honeywell RTH9580WF Wi-Fi Smart Thermostat ( was not able to register to the Total Connect Comfort website. This was 3 days ago. I ignored this but unfortunately today my thermostat stopped working. I think I messed during wiring of the system. How do I go about fixing this? Totally frustrated, please help!

  • #2
    Inside the RTH9580WF Wi-Fi Smart Thermostat are many wires that carry out different functions. This is so that all heating and cooling devices can operate seamlessly. Missing wire connections, loose wires, faulty as well as aged wires can cause the thermostat to lose its connection hence disrupting services.

    The wires are labeled R, W, Y, C, and G. One end of the wire is connected to the thermostat and the other to the device. The thermostat as well has terminals labeled to match each of the respective wires. The most probable reason that your thermostat has stopped working is that any of the wires are not in its rightful position.

    Before you carry on, do turn off the power supply from the main circuit breaker.

    When doing the connection ensure that the wires are connected while observing their different colors. The red-colored wire is a main power supply wire of 24-Volts power to the thermostat unit. The yellow one is for the cooling system and might be connected to the air conditioner (if there is one at your place). The white wire is for the heating device such as a furnace. The green-colored wire is used to connect the fan to the thermostat while the C-terminal wire is a common ground wire. The illustration is in the diagram below.

    Click image for larger version  Name:	RTH9580WF.JPG Views:	0 Size:	19.6 KB ID:	2650

    Following this, your thermostat should be able to get back to work hoping that you did not blow a fuse.

    To enable your thermostat to register to the Total Connect Comfort website, first ensure that the thermostat is correctly enrolled on your homeWi-Fi network.
    1. Go to SETTINGS; Wi-Fi Setup, check for the Wi-Fi-signal strength icon.
    2. Verify that the Wi-Fi router has a good internet connection.
    3. On your computer, verify that you can open the site at
    4. If you cannot open the site, switch off the internet modem for a few seconds, then power it back on.

    After this, you should be able to connect to the website and register. You can refer to the Technical Datasheet for more information.
    Last edited by Lameck; 11-30-2020, 11:51 AM.