Will the Lyric T5 WiFi Thermostat work without a C wire being installed?
Last updated
5/12/23
No, the Honeywell Lyric T5 WiFi Thermostat requires a C wire or Common wire be connected to the C terminal in the thermostat and at the equipment terminal.
The C wire or Common wire is needed to provide 24-volt power to your Honeywell T5 WiFi or connected thermostat.
There is a temporary solution and a couple of permanent options that you can implement if you do not have a C wire, as well as contacting an HVAC professional near you for additional help with your Honeywell T5 WiFi Thermostat install.
MESSAGE US
Message us on Twitter for help with our products.
Monday through Friday:
9am to 6pm CDT
Saturday and Sunday:
9am to 5pm CDT