Cureent thermostat has 2 Red wires

[Nester3]

Hello heroes,

I currently have two thermostats,  one for heating and for cooling.  I'm replacing the heating thermostat with a nest learning thermostat. 

It has one white wire and two red wires.  Both red wires are connected to R on the old thermostat. 

 

I'm not sure how should I setup my nest with above wiring. 

Help appreciated. 

[EdwardT]

Hi Nester3,

Thanks for reaching out. I'd love to know more about this and I have a few questions:

• Could you trace the wires to the board of your heating system to check where the other ends of the wires are connected to?
• Does your cooling thermostat also have 2 red wires on the R terminal?

Looking forward to your response.

Thanks,

Edward

[EdwardT]

Hi Nester3,

It's me again, I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do. 

Thanks,

Edward

[Nester3 · Accepted solution]

Hello Edward,

Thank you for checking in. I figured out the issue. The cooling thermostat was powered by the heating thermostat and hence the two red wires inserted together.

As soon as I powered on the heating thermostat with only red wire, cooling thermostat started complaining about loss of power on its R wire.

As  a solution, I wounded one Red wire onto another and inserted it into the R slot of new thermostat. Problem solved.

[EdwardT]

Hi Nester3,

Thanks for sharing the steps you've done to resolve it! I'm glad to hear that it's working now. Please let us know if you have other questions and we'd be glad to help!

Thanks,

Edward

[EdwardT]

Hi Nester3,

Since we have not received any more replies for quite some time, I will lock this thread now. Please feel free to create a new thread should you have some more questions or concerns in the near future and we'll be more than glad to help.

Thanks,

Edward