Wifi Thermostats Will Not Work with My C Wire Setup


  #1  
Old 07-21-21, 02:11 PM
A
Member
Thread Starter
Join Date: Jul 2021
Posts: 1
Received 0 Votes on 0 Posts
Wifi Thermostats Will Not Work with My C Wire Setup

I currently have a forced air system, all updated in the last 5 years. I currently have 2 programmable thermostats, downstairs and upstairs, powered by C wires. I have C, W, G, R and Y. Both work fine. The C and R wire is producing around 27 volts. I Tried to install both a Honeywell and an Emerson Sensi Touch wifi thermostat, and neither would work. The Sensi Touch backlight comes on, but will not power up the menu. The Honeywell color wifi thermostat will not power up at all. I have tried both upstairs and downstairs, with the same results. I know there is power because my current programmable thermostats work fine, they have no batteries. Anyone have an idea why my system will not power up these new wifi thermostats. Any comments will be appreciated. Thanks.
 
  #2  
Old 07-21-21, 06:33 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 70,159
Received 2,969 Votes on 2,679 Posts
Welcome to the forums.

I know there is power because my current programmable thermostats work fine
Well..... you know you have the 24vAC. You don't know if the C is correct.

Possibly the C is not connected in the right place ?
If you have a gas furnace the C should be connected next to the R, W, Y, G.

Pictures are helpful..... how-to-insert-pictures.
 
  #3  
Old 07-22-21, 12:46 PM
Geochurchi's Avatar
Member
Join Date: Nov 2012
Posts: 5,583
Received 154 Votes on 140 Posts
Hi, 2 programmable thermostats and 1 furnace?
Geo 🇺🇸
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: