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Nest power connector

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bigjoe1980
bigjoe1980 Member Posts: 16
in Gas Heating

Hello all,

Please tell me if I connected my nest power connector correctly to my new gas boiler. I only have two wire and no C wire. So I needed the nest power cable to charge my nest thermostat .

I connected the two black wires the relays the boiler to the R and W on the two white nest cables.

20251221_171951.jpg

Comments

  • 109A_5
    109A_5 Member Posts: 3,684

    What is shown in the picture looks incomplete. The R, C and W have to be correct to the boiler wiring. When it is hooked up correctly it should work.

    Sometimes the terminals are labeled on the insulating plate.

    image.png
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • mattmia2
    mattmia2 Member Posts: 15,984

    the terminals on the boiler might be labeled r g and c depending on what part the manufacturer used

  • bigjoe1980
    bigjoe1980 Member Posts: 16
    1000161038.jpg 1000161037.jpg 1000161036.jpg 1000161035.jpg 1000161034.jpg

    Here are some pictures of my nest power connector. My nest thermostat is making a buzzing sound when heating. I am getting heat and it's working but not sure why the buzzing. And not even sure if it's still connected properly but somehow getting heat.

  • 109A_5
    109A_5 Member Posts: 3,684

    Well I don't know why it is buzzing. What is your boiler make and model ? If it is what I suspect, you probably need a relay for proper boiler and NEST operation.

    image.png
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 11,748

    Buzzing is not good. you want to fix that.

    …on the other hand, if the thermostat is only humming, it is probably because it forgot the words. If you can find the right sheet music with lyrics and place it in view of the thermostat the humming may stop.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    bjohnhy
  • HVACNUT
    HVACNUT Member Posts: 7,305

    Try switching R and W•Y on the boiler side.

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