Honeywell Wi-Fi thermostat with no c wire
#1
07-27-15, 07:17 PM
Honeywell Wi-Fi thermostat with no c wire
Hi, I was wondering if there is a simple way to get this working with my older gas furnace/system? I have no *c* wire, but it looks like there's an extra wire. However, on my furnace I do not have a *c* terminal.
Pictures of my wires and furnace terminal are attached.
Pictures of my wires and furnace terminal are attached.
Last edited by Robot818; 07-27-15 at 07:48 PM.
#2
07-27-15, 07:38 PM
Group Moderator
Welcome to the forums.
In your hijacked picture you'll see I pointed out the condenser cable. The red wire from that two wire cable should connect to yellow (Y) at your stat. The white wire is the C connection.
Connect your spare wire to thermostat there and give it a try. Remember to shut power to furnace off when working on any wiring.
In your hijacked picture you'll see I pointed out the condenser cable. The red wire from that two wire cable should connect to yellow (Y) at your stat. The white wire is the C connection.
Connect your spare wire to thermostat there and give it a try. Remember to shut power to furnace off when working on any wiring.
#3
07-27-15, 08:10 PM
Thanks for the quick reply! Sorry, it looks like the way I took that original photo could have left a key detail out. It looks like the red wire is connected to the yellow wire which is currently connected to Y/0 on the stat (i think?). Can you tell me if this is correct, or if i totally messed up what you're suggesting
On the furnace, would I move the white wire to Y and attached that short extra wire to C?
On the Stat, would i then move Yellow to Y1 and the extra to C on the new stat?
On the furnace, would I move the white wire to Y and attached that short extra wire to C?
On the Stat, would i then move Yellow to Y1 and the extra to C on the new stat?
#4
07-27-15, 09:08 PM
Group Moderator
No...it is as I described. The red wire from the condensor connects to the yellow stat wire which should be on Y terminal (not O) at the stat.
Assuming you're talking about the white wire that is on the terminal I labeled as C.... it remains right where it is.
You will connect your spare stat wire, which looks like blue, to the same terminal. You will have a white and blue under one screw on the C terminal. Then connect the blue wire to C at the stat.
Assuming you're talking about the white wire that is on the terminal I labeled as C.... it remains right where it is.
You will connect your spare stat wire, which looks like blue, to the same terminal. You will have a white and blue under one screw on the C terminal. Then connect the blue wire to C at the stat.
