Nest not powered after installing Nest Power Connector

[helpmepl0x_ray]

Hello all, I have a simple heater only furnace, previously had a battery powered 4x AA thermostat with only two wires, (R & W).  I hooked up the nest and put R and W into the nest, and then I got an N260 error.  So I bought a Nest Power Connector, wired it up properly ( I think ), and I am still getting the N260 error.  I will attach some pictures. When I install the Nest Power connector, do I need to move around my wires on the new thermostat side? Or do I leave them on R and W?  I went through the settings , and it is not detecting the nest power connector.  How can I debug this? Can I check for 24V AC across the R & W wires at my thermostat to confirm the power connector is working? Thanks in advance...

[helpmepl0x_ray]

[CoolingWizard]

The picture above show aN air Conditioning only control board.  The terminals are R, G, Y, C, YG.  Can show me where you have the Nest Power Connector hooked up at?

The AC Cooling Wizard

[helpmepl0x_ray]

Maybe it does both AC and Heating? There is no AC unit, this is an older home without AC.  It just has those two wires, which is exactly where I installed the nest pro connector.

 I will add another picture, these pictures are before I installed the connector, I uninstalled it because it didn't work and I needed heat.  Is there any way I can check that the power is getting to my plug if I reconnect it? Blue is C (common), that is basically a ground wire, yeah?

[helpmepl0x_ray]

[CoolingWizard]

Your thermostat cable should be connecting on the right hand side of that control board. I don’t see your main thermostat cable coming to this board. That small board on the left-hand side is a special sub board for multi speed fan control.

The AC Cooling Wizard

[helpmepl0x_ray]

On the first picture (left side) the red and white wires , those are the two wires that go to my thermostat.

[CoolingWizard]

First of all, I am 36-year HVAC experienced engineer. That control board on the left is designed to convert a 4-wire thermostat to work with a 5-wire control system.  Basically, you do not need it.  You have a heating only system and that is 100% handled by the main control board.  You seem to have a 2-wire thermostat cable so you will not have a common wire. So here is how you need to wire up your Nest Power Connector.  
1. turn the power to furnace off.  
2. Disconnect the Red and the White wire of the thermostat cable. 
3. Connect the thermostat cable White wire to the Gray Y*W power connector wire. 

4. Connect the thermostat cable Red wire to the Gray R power connector wire.

5. Connect the Power Connecter White R wire to the R terminal on the main board (right side)

6. Connect the Power Connector White C wire to the Com terminal on the main board. (right side)

7 Connect the Power Connector White R*W wire to the W/W1 terminal on the main board. (right side)

8. Turn the power back on. 
When your Nest thermostat is not calling for heat, the power connector will send the Common power to the Nest thermostat on the W wire.  The Nest Power Connector works with the Nest Learning Thermostat and the Nest E Learning Thermostat.  The older thermostats will require a software update before it will recognize the Power Connector.  

The AC Cooling Wizard

[helpmepl0x_ray]

Thank you for that, it all makes sense, but I have 2 questions,
1.  What about my fan (Green wire) if I connect straight to the right side, will the fan still turn on with the heat? I thought the left side board was doing that control for me.  

2.  When installing and removing the nest connector, do I swap the wires around at the nest itself? I.e. Without the nest connector I would install R and W on the nest, but now with the power connector, do I move my R and W wires to R & C? Thank you!

[CoolingWizard]

The Main board controls the entire system; your blower fan, your gas furnace.  The small board on the right is used for thermostats that only have 4 connections.  As I stated you do not need that adaptor board.  When your thermostat calls for heat, the first thing that happens is the induction fan starts, then it checks the combustion chamber to verify it is sealed and not leaking. Next it will send power to your igniter and turn on your gas valve. The safety system will verify there is a flame burning. As the heat exchanger warms up, an temperature probe will signal the control board to start the blower.  

You do not need to make any changes with the Nest thermostat wires.  Leave them in R and W. The nest learning thermostat has a design so that it can use the W or Y wire to try and reach the common side of the transformer. Now what the nest power connector does, is it ensures that the common is routed to your W wire whenever there’s not a call for the furnace to be on. This process will allow your thermostat to be fully charged overtime. 

The AC Cooling Wizard

[Jake]

Hey helpmep10x_ray,

Thanks so much for the helpful replies CoolingWizard.

I wanted to check in and see if you managed to see CoolingWizard's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.

Best regards,
Jake

[Jake]

Hi helpmep10x_ray,

I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

[Jake]

Hey there,

I wanted to check in with you, and let you know that I will be locking the thread in 24 hours.

Best regards,

Jake

[helpmepl0x_ray]

The power connector did not work, i gave up on this

[zoeuvre]

Hello helpmepl0x_ray, 

We're sad to see you go. We hope we can make it up to you in the future. We're always here to help if you ever change your mind. In the meantime, I'll go ahead and lock this thread within 24 hours. If you run into any more questions in the future, please feel free to create a new thread.

Thanks for your help, @CoolingWizard and Jake. 

All tne best,

Zoe