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  1. First your idea should work. You would need to...

    First your idea should work. You would need to reverse Y and W on the relay as W should come from the NO contacts since you will set the O/B to B (powered in heat mode).
    You may need a 3 pole relay...
  2. Yes, sorry. Y to G at the air handler.

    Yes, sorry. Y to G at the air handler.
  3. What you can do is re-purpose the green wire for...

    What you can do is re-purpose the green wire for a C. Move it from G to C at both the thermostat and air handler. Then put a jumper to connect Y and G at the air handler. You lose independent...
  4. With Nest verify you have a C wire connected. ...

    With Nest verify you have a C wire connected. You probably have a bad contactor in the outside unit.
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    Thermostats usually get power from the Rc so...

    Thermostats usually get power from the Rc so leave the jumper in.
  6. Your new thermostat is 24vac based. You need the...

    Your new thermostat is 24vac based. You need the line voltage version.
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    That is a digital dehumidistat which is not...

    That is a digital dehumidistat which is not compatible with Nest or other standard thermostats/dehumidistats. The control board of you system might have contacts for a standard two wire relay...
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    You could mount the old thermostat near the...

    You could mount the old thermostat near the controller and only use the TN4, R, and C wires. Then in parallel use R, C, W for the new wifi thermostat. A bit of a compromise as you couldn't control...
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    Honeywell t874r1442 with base Q674L1504. The X...

    Honeywell t874r1442 with base Q674L1504. The X in those is a common. Goes to C in most new thermostats. B goes to O/B terminal and gets configured as B-activate on heat. W2 is aux which goes to...
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    There are many ways to wire. Do you have a...

    There are many ways to wire. Do you have a humidistat? What wires changed with the new thermostat? If you put the old one back does the humidifier work?
    Where do the humidifier solenoid wires...
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    Follow the wires from the solenoid. Should be a...

    Follow the wires from the solenoid. Should be a humidistat and that should connect to the furnace which I don't see.
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    Yes, X on that thermostat base is the same as C...

    Yes, X on that thermostat base is the same as C on Nest.

    When asked tell Nest you have single fuel. The B wire goes to the O/B terminal and you need to tell Nest it is activated on heating.
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    Blue and orange of the PAM-1 go to the TT boiler...

    Blue and orange of the PAM-1 go to the TT boiler terminals. Cap off the yellow and black wires separately so they don't touch anything. Then the PAM-1's white and red are the 24vac relay coils. One...
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    There is a gas/electric setting on the thermostat...

    There is a gas/electric setting on the thermostat (sometimes a physical switch). Gas assumes the blower is turned on by the furnace. Electric lets the thermostat know to turn the blower on with a...
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    I think you have a heat pump. On the old...

    I think you have a heat pump. On the old thermostat the blue wire went to B (heat reversing valve). So on new blue needs to go to O/B and the white to W2/Aux/E. Then you need to program the...
  16. You can swap R and C (as long as they only go to...

    You can swap R and C (as long as they only go to the transformer) but shouldn't matter. Could be a damper isn't opening or closing fully?
  17. Not an easy thing to do as Nest thinks that it is...

    Not an easy thing to do as Nest thinks that it is smarter than you are.

    Start here: ...
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    You have RedLink so why not just expand it to...

    You have RedLink so why not just expand it to include the "smart" options you want? https://forwardthinking.honeywell.com/redlink

    Otherwise use this for your 2 wires to support most any...
  19. R wire to Nest Rh and W wire to Nest W1. If you...

    R wire to Nest Rh and W wire to Nest W1. If you have the Nest 3rd gen (not E) then take other two wires to Nest's Rc and C - doesn't matter which as they go to a separate transformer that was used...
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    If you have the same thermostat then you can see...

    If you have the same thermostat then you can see from the pic that things are labeled RH RC W Y G. Post a picture of you you have if not clear.
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    I wouldn't touch it as it looks like it is...

    I wouldn't touch it as it looks like it is already dripping. Can you turn off the boiler?
  22. Thread: Model RTH111

    by Stuff
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    "Normal" for furnace is red-R, white-W, blue-C,...

    "Normal" for furnace is red-R, white-W, blue-C, green-G, yellow-Y. Not Used would be C/blue/cyan on a different model thermostat. For a heat pump white may go to O/B instead.

    "Normal" is not...
  23. The Baystat 239 thermostat was very popular for a...

    The Baystat 239 thermostat was very popular for a long time.

    G to R would force the fan on 24x7

    It does sound like you blew a fuse - normally located in the air handler in the attic. Should be...
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    Not many do this as rooms will be different...

    Not many do this as rooms will be different temperatures. Sometimes extreme.
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    I believe the front piece pulls off by pulling on...

    I believe the front piece pulls off by pulling on the bottom. This separates the front from the rear sub-base that is screwed to the wall.
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