![Need help with Venstar add a wire & Honeywell Wifi thermostat installation - DoItYourself.com Community Forums Need help with Venstar add a wire & Honeywell Wifi thermostat installation - DoItYourself.com Community Forums](https://www.doityourself.com/forum/attachments/air-conditioning-cooling-systems/33440d1403209186-need-help-venstar-add-wire-honeywell-wifi-thermostat-installation-furn2.jpg)
Need help with Venstar add a wire & Honeywell Wifi thermostat installation - DoItYourself.com Community Forums
![Honeywell THP9045A1023 Wiresaver Wiring Module for Thermostat - Programmable Household Thermostats - Amazon.com Honeywell THP9045A1023 Wiresaver Wiring Module for Thermostat - Programmable Household Thermostats - Amazon.com](https://m.media-amazon.com/images/I/71pGJ8WX0aL.jpg)
Honeywell THP9045A1023 Wiresaver Wiring Module for Thermostat - Programmable Household Thermostats - Amazon.com
![Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098 - Amazon.com Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098 - Amazon.com](https://m.media-amazon.com/images/I/71AjSMTbLJL._AC_UF350,350_QL80_.jpg)
Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098 - Amazon.com
![Newbie: Any way to add a c wire to existing transformer or wires? Do I need a new transformer with a “c” terminal? (Trying to connect a Wi-Fi thermostat to control boiler) : Newbie: Any way to add a c wire to existing transformer or wires? Do I need a new transformer with a “c” terminal? (Trying to connect a Wi-Fi thermostat to control boiler) :](https://i.redd.it/7yxznh8zs8z71.jpg)
Newbie: Any way to add a c wire to existing transformer or wires? Do I need a new transformer with a “c” terminal? (Trying to connect a Wi-Fi thermostat to control boiler) :
![Old thermostat works, but I can't get the Honeywell T9 to work. T9 require C Wire that was not in the wall. I added C wire & RC wire via plug-in 120v Old thermostat works, but I can't get the Honeywell T9 to work. T9 require C Wire that was not in the wall. I added C wire & RC wire via plug-in 120v](https://i.redd.it/qgn9tccrp6a91.jpg)