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Nest thermostat Error

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mbar16
mbar16 Member Posts: 1
in Gas Heating
I have a gas boiler that has 3 zones. Basement, 1st floor and 2nd floor. I have a nest on the 1st floor and the second floor. Basic thermostat in the basement. It seem that when the basement (zone 3) kicks both nest thermostat say that have no power. Does anyone have any advise or suggestions? 
zvalve

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  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    Yeah, 2 things.
    Dump the nests.
    -or-
    Make sure they are wired correctly.

    What other controls are on the boiler, and how are the Nests wired?
    Zone valves or circulators?
    Zone panel or relays?
    Common wires to the Nests?
    Pictures or accurate drawing would help.

    There was an error rendering this rich post.

  • ratio
    ratio Member Posts: 3,645
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    The Nests, when wired in 'power stealing' mode (no common) rely on the potential difference between the R & W to keep themselves charged. That goes away when a thermostat calls for heat, which is literally connecting R to W thought a relay contact. Either add a common (from the right power source, if multiple), or an independent power source.

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