Burnham K2 combi boiler

[kdale3]

I have a burnham K2 combi boiler. It was two wires to my nest RH and W. I want to add a C wire to eliminate short cycling. What wiring changes need made?  

[Houptee]

If the thermostat cable does not go directly to the Boiler do you have a control box near the boiler where the R and W are connected?

Sometimes it is a Taco control or a Honeywell control.

If that is where your existing thermostat wires connect then you use the C in the control.

I would need to see how the thermostat wires connect at your boiler or to the control box to help you hook up a C wire.

If the R and W goes directly to the boiler, does it have a screw marked C on the terminal strip where the existing thermostat wires connect?

Do you have any extra wires in the cable that goes to the Nest or is it the 2 conductor cable?

If you don't have extra wire to use for C then do you think you can pull a new 5 conductor cable to the Nest? Usually the cable is not stapled inside the wall and you can tie onto it and pull a new one up from basement etc.

[Markjosephp]

Hello there,

Thanks for assisting here, @Houptee.

@kdale3, I hope you've seen Houptee's response. Please let us know more about this so we can assist you right away.

Regards,

Mark

[Markjosephp]

Hi kdale3,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Thanks,

Mark

[kdale3]

Econ 3 is the common. That is the harness that goes to the display.

[Jake]

Hey there,

Sorry for the late reply. I wanted to follow up. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[Jake]

Hey there,

I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

[Jake]

Hey there,

I wanted to check in, and let you know that I will be locking the thread in 24 hours.

Best regards,

Jake