Fixing connection errors

Honeywell Wi-Fi Thermostat Troubleshooting

Not long ago I bought and installed a Honeywell RTH9580WF Wi-fi thermostat. It is a really great device, but unfortunately it is powered by power from the furnace (through the thermostat wire). If the furnace is powered down for service (or from a power loss) the thermostat will lose its wi-fi connection to your home router, and you will get the following error via email:

The following Alert has occurred:
The thermostat (xxx) is not communicating with My Total Connect Comfort.
Alert occurred at: 11/19/2017 1:43:03 PM
Location Name: (xxx)

Thermostat Name: (xxx)

The iPhone app for the thermostat won’t work either. Even after the power is restored to the thermostat and it is working normally, you may still get connection errors. If so, here’s the fix:

Go to the system menu on the thermostat and enter the Wi-fi setup section. Make sure your know your wi-fi network’s current password! Disconnect the thermostat from the Wi-fi network (the only option available in the menu). Then reconnect, selecting your network and then entering the password. Note the Device MAC ID MAC ID and CRC number on the thermostat screen – write it down or take a pic of it on your cellphone.

Once the thermostat is set, go to a web browser on your computer or smartphone and log on to:

https://mytotalconnectcomfort.com/portal/Locations

If the Total Connect website is still bitching that the thermostat is off-line, you will have to delete the location, and then add it back in again. Once you do, Total Connect will ask you to verify it from the thermostat. From that point you should be back to normal. 

Feel free to comment!

Mick Seeley

Oceanport, NJ