cancel
Showing results for 
Search instead for 
Did you mean: 

Honeywell to Nest E - 2 wire system

JakeFCM
Community Member

I am having issues to see what goes with what. I have a strong feeling that this thermostat isn’t compatible but wanted to get feedback.

0FB5D86F-C5FD-4E24-973A-F63D9A3BFEDB.jpeg

Attached is the picture of the wiring of my Honeywell thermostat. This unit is only connected by the red (r) and blue (c) wires.  However, there are unused yellow, green and white wires that are not stripped and terminated to anything. Am I able to use those wires to my nest install?

5 REPLIES 5

Wisfamily
Community Member

We have hot water baseboard heat. Its a 2 wire system  

.  We were able to connect a 3 rd green wire  to C and bypass the C connector issue.

There is probably a way to make yours work with ur system.  

Houptee
Silver Product Expert
Silver Product Expert

The wire to your C is actually W wire.

So you would connect R to R and the blue to W

It might be ok without a C wire but its always best to have a C wire.

If you can post pics of where the wires connect at the boiler we might be able to show you where you can connect one of the spare wires to the Common side of the transformer for a C wire.


Houptee -- NJ Master HVAC Licensed Contractor

aatienza
Community Specialist
Community Specialist

Hey there,

 

JakeFCM, checking in — we hope you've got the answer you're looking for. Let us know if you have more questions in mind.
 

I appreciate the help, Houptee.

 

Thanks,

Archie

aatienza
Community Specialist
Community Specialist

Hey there,

 

I just wanted to follow up to see if you still need our help. Please let us know as we would be happy to answer any questions you may have. 
 

Thanks,
Archie

aatienza
Community Specialist
Community Specialist

Hello there,

 

Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.
 

Thanks,

Archie