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Thread: nest thermostat

  1. #14
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    Apr 2012
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    Charlotte Area NC
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    Why not use an isolator relay?


    Sent from my van

  2. #15
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    Jul 2013
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    Northern Virginia
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    id check the amp draw on that circuit. also when you say nest gave him a new stat did the give him a new module and sub-base? did he/you install both new?

  3. #16
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    Feb 2013
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    We wont touch them.... just tell customer we will replace it with anything we stock n work on

  4. #17
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    Quote Originally Posted by tegtma08 View Post
    We wont touch them.... just tell customer we will replace it with anything we stock n work on
    I will agree with you BUT..... The world will be wanting the NEST T-stats, so you better get used to them.

    My two Pasos.

    Yuma,
    What is snow? Is it that white stuff in a freezer?

  5. #18
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    Feb 2013
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    Honeywell wifi lennox icomfort little different but close enough
    Last edited by tegtma08; 05-09-2014 at 05:30 PM. Reason: hit wrong button

  6. #19
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    Mar 2013
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    Billington Heights, NY
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    Quote Originally Posted by surenuff View Post
    I am not familiar with this type of t-stat. But for all practical purposes, it should have the same kind of contacts as other t-stats, and therefore should not be dropping voltage though its contacts. Since it does this in the heat mode but not the cool mode, I would think it could have something to do with how the t-stat is sending or switching power to the reversing valve "o" and "b" terminals of the t-stat when it is operating in the heat mode. what kind of unit is it on? This may help us help you.
    nest is all electronic, there are no conventional relays. nest is poo.
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"

    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

    Jtrammel - "Im going to sell hvac systems derp derp derp"
    BBeerme - "every time he opens his mouth, he reminds me of a cow without the fart bag."

  7. #20
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    Oct 2010
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    san antonio, tx
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    Thread Starter
    Thanks for all the input, i do believe the stat is the problem. taking stat out of the equation solves the problem. the nest tech support does admit power stealing problems with this stat.

  8. #21
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    Mar 2013
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    I got a call today from a Gene La-somethingother at Google Nest Labs. He left a voice message about how he didnt appreciate my calling the Nest "poo".

    There's also a bunch more he left regarding how they're working on staging and other gobbledgygook. He wanted me to call him so we could talk about the issues, etc. (like it's not all been covered here ad infinitum). Though, I'm sure it's more of a sales pitch... trying to convince me to support something I know to cause problems with most everything. It wont even work with the neighbor's 1952 Lennox furnace that runs a 48 volt transformer...

    Anyone else get this call? I still have the number if you want it to give the guy some 'feedback' ...
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"

    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

    Jtrammel - "Im going to sell hvac systems derp derp derp"
    BBeerme - "every time he opens his mouth, he reminds me of a cow without the fart bag."

  9. #22
    Join Date
    Dec 2007
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    Dump the NEST and be done with it.

    No common and it becomes a power robbing stat and as we should know that usually leads to issues on systems other than bare basic types. Even HW puts a resistor in their power robbing stats for certain systems.

    The NEST is beautifully marketed, but poorly engineered. There are far more reliable stats that will give the same results as the NEST.
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  10. #23
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    yeah... "Nest is poo"
    Experience - knowing when to get the hell out of the way and plug your ears. "Don't be a sissy. Turn it on!"

    Poodle Head Mikey - "the world is well populated with the unknowing and the uncaring and the stupid."

    Jtrammel - "Im going to sell hvac systems derp derp derp"
    BBeerme - "every time he opens his mouth, he reminds me of a cow without the fart bag."

  11. #24
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    Mar 2017
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    Las Vegas
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    After reverse engineering the t stat i would like to state some things about nest. 1st It does have a Li-po battery and it will not run long without a good common to complete the charging of the battery. 2nd The w1 terminal steals power from the w1 terminal in small pulse frequency burst to charge the battery. If this is malfunctioning you will see control chatter or worse yet heat that doesn't shut down. Under settings battery voltage is shown. If this voltage drops below 3.6 you loose wifi and or more. I am still working on this project to figure out more about the nest. Thanks

  12. #25
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    Feb 2006
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    I ran across a nest dropping voltage to the contactor also. Hooked up the common and problem solved. Also ran across another where the manual reset high pressure switch opened and nest goes dead. After HP reset. You either have to wait until nest battery recharges or charge with USB. Again, this is without common hook-up. With that said maybe the Nest isn't all that bad as long it is wired for 24volt operation. Instead of power stealing.

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  14. #26
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    Jul 2014
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    As I understand, the power robbing is threw the y terminal, not the w like most other power robbing stats. If it doesn't have direct hookup to the contactor because of a board or time delay it may not work without a common wire either. Unless they have changed them recently. I never tried a resistor across y and c.

    Sent from my SCH-S968C using Tapatalk

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