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  1. If the Nest is not keeping power from the...

    If the Nest is not keeping power from the transformer feed on R and C then you have a bad Nest. Verify power with only R and C connected. Check voltage and current settings in the menu - Settings -...
  2. Those are old zone dampers in the third photo. ...

    Those are old zone dampers in the third photo. There is normally a zone control board nearby where the thermostat, damper, and furnace wires connect. Guessing that this is a Mastertrol which used...
  3. Those are old zone dampers in the third photo. ...

    Those are old zone dampers in the third photo. There is normally a zone control board nearby where the thermostat, damper, and furnace wires connect.
  4. The old thermostat's B/Cool is not the same as...

    The old thermostat's B/Cool is not the same as the new thermostat's B. It is something that is rarely used today as it is a "not" W. There are only a few electronic thermostats that support it and...
  5. First issue is you didn't loosen all the screws...

    First issue is you didn't loosen all the screws so when you pulled the thermostat off of the backplate you pulled the W connection along with the white wire.

    So white goes to W on the new...
  6. No, that is not compatible with Nest or any other...

    No, that is not compatible with Nest or any other standard thermostat. Contact Lennox as they may have an adapter to provide the connections for a standard RWCYG thermostat.
  7. I don't think your new thermostat has that...

    I don't think your new thermostat has that option. Give Honeywell support a call at 1 800 828-8367 to confirm.

    You can manually change to "emergency heat" to lock out the compressor but you'd...
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    You can replace the old EIM with a new one that...

    You can replace the old EIM with a new one that has wireless. New thermostat and indoor sensor. Then need Redlink module for Internet. https://forwardthinking.resideo.com/related_links/50-1311.pdf
  9. That's the boiler zone control. (notice that it...

    That's the boiler zone control. (notice that it only has white and red thermostat wires connected) There will be a separate panel that controls a/c that will have the other color wires attached. ...
  10. duplicate - deleted

    duplicate - deleted
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    Sounds right. Note C from the thermostat would...

    Sounds right. Note C from the thermostat would connect to the transformer terminal that has the blue wire on it.
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    Yes, first turn off the circuit breaker before...

    Yes, first turn off the circuit breaker before moving any connections. No guarantee but that breaker should cut power to the transformer so you don't short out anything. Yes, your approach to...
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    To use the transformer you need to attach both...

    To use the transformer you need to attach both wires. One to the C terminal and one to the R/Rc along with the R from the HVAC system.

    G to C transition is safer as long as you hook it up right....
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    That trick only works properly for heat only...

    That trick only works properly for heat only applications as the Rc needs to connect to the air handler.

    I assume that you don't have a spare wire for C. Some repurpose the wire that is doing G...
  15. Nest used to work with IFTTT which you could do...

    Nest used to work with IFTTT which you could do alarms with. Now they say to use Google Assistant. I haven't followed this but might give what you need.
  16. 1. Lots of times the sound is low refrigerant in...

    1. Lots of times the sound is low refrigerant in the system. Verify the O/B is set to "seasonally." Also adding a C wire keeps Nest from triggering the valve when it shouldn't.
    2. This might be...
  17. Is see no reason that wouldn't work. Ecobee may...

    Is see no reason that wouldn't work. Ecobee may simply be playing it safe as many will wire it differently from your diagram.
  18. I don't know why they said you couldn't go to 2...

    I don't know why they said you couldn't go to 2 thermostats. Do you have 2 free wires to each ecobee? If so you should be able to parallel to the acc+ and acc- connections. If you only have one...
  19. Thread: Help on Findings

    by Stuff
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    This sounds like you have a contaminated system. ...

    This sounds like you have a contaminated system. Time for a completely new system and get someone else to do it that knows what they are doing.
  20. I don't think what they told you is correct. ...

    I don't think what they told you is correct. They used the thinking that if there is no C then B must be C. This is true for Trane and some others but the manuals for your thermostat show C in the...
  21. As wired there are few thermostats that would...

    As wired there are few thermostats that would work with your setup. No C wire but both O and B. Since you don't have a heat pump the O and B wires may not be in use.

    You need to go to the other...
  22. See where the white wires connect in the air...

    See where the white wires connect in the air handler. One setup could be a relay that is driven off of the W and C but maybe something strange. A more "normal" connection would be to take the two...
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    Good to hear that you got it sorted out. There...

    Good to hear that you got it sorted out. There are so many functions in these electronic thermostats that are easy to miss.
  24. Connecting TT of the air handler to the Taco's TT...

    Connecting TT of the air handler to the Taco's TT doesn't make sense. Does the air handler even have TT terminals?
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    From the manual you can't set heat and cool to...

    From the manual you can't set heat and cool to 75 as temps need to be 3 apart. That may be the issue you are seeing.

    Also option 12 needs to be enabled in the menus as the "auto" function is...
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