Reddit reviews Coleman Cable 09634 CL2 Bulk Thermostat Cable, 18-Gauge 5-Conductor 50-Feet

Ya, neither did mine, which is why I ran a full new 5-wire thermostat wire. I was able to just tie the new wire to the thermostat side of the old wire and then pull it down and through. I did have a couple staples to remove, but it worked out pretty well!

I literally just had this issue, and fixed it two days ago.

So what kind of wire do you have at your existing thermostat? You're using two, but are there other wires present? If not, you're going to have to run a new thermostat wire like I did. Here's 50 ft of it from amazon.com

https://smile.amazon.com/gp/product/B0026H8L7E/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

Once you have that run, you need to wire it up. You need to use three wires for a heat only application (I don't have central air, and it's controlling one zone on a oil fired boiler). The white, the red, and blue. I just cut the others, and wrapped them around for later use. Do you want the ecobee to control all zones at once? Or just one zone? I'm assuming you want it controlling only one zone.

The White and Blue (this will be your common) wires go to the yellow wires on either your zone valve (in my case) or a pump. Not sure of your configuration. I had one pump, and several zone valves. Others have several pumps. All depends on what you have.

Okay, so the red will be wired to your 24VAC supply from your transformer. I used wire nuts, and made it in parallel to the other devices. This is important. Use a multimeter to determine what your voltage is ( put it on ~V setting). If you have 120V going to your thermostat, you'll probably fry it.


Here's how I wired mine:

White- Yellow on your Zone Valve. This connection is only two wires. Your white, and one yellow.

Blue- Common. Other yellow on the same zone valve. It's AC so it doesn't matter which one you wire to which yellow, but your common is called common for a reason... every zone valve you have needs to be wired in parallel to each other with the blue, AS WELL AS the white from your 24vac transformer. I have three zones, so five wires total (one yellow from each valve, plus white from 24vac, plus blue from thermostat) are wire nutted together.

Red- 24VAC on transformer (the wire coming out of my transformer was black in color, but it should be red). This is the hot one.


That should do it. Let me know if you have any questions. This took me several hours of troubleshooting, and the internet was surprisingly not a lot of help. I'm sorry in advance if my technical writing skills aren't the best.