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Nest Learning Thermostat Does Nothing When Connected to its Base

Peter_B
Community Member

I followed the instructions and wired up my base connecting R to red, G to Green, W1 to White, and C to Blue, just like on my old thermostat. The wires are fully inserted, the tabs are down, and the power is on (I used a voltmeter to check the wires going into the base). When I insert the Nest Learning unit onto the base, and push until it clicks, NOTHING HAPPENS. No matter how many times I reinsert it, with no wires obstructing it, nothing. No lights at all.

I then took the unit and plugged it into a USB charger. I started immediately with a green flashing light, Google logos, then a message to insert on its base. So I insert it onto its base again and it then says thermostat is restarting - back in a bit. It then goes dark, and nothing happens.

Is there a way I can force the unit to look for its electrical and mechanical connections?

1 Recommended Answer

Peter_B
Community Member

I contacted support and they helped me solve it as follows:

1) charge the unit using usb for another hour

2) disconnect the C wire and mask it off

Unit now restarts when connected to base and setup completed. Thank you all.

View Recommended Answer in original post

9 REPLIES 9

Houptee
Silver Product Expert
Silver Product Expert

Try charging it overnight with the usb cable maybe the battery is very low.

Peter_B
Community Member

I charged it for an hour and reinstalled it. Nothing has changed. When plugged into the USB, the nest starts up and then shows a message saying plug into base station. When plugged into the base station it then shows the message saying back in a bit and it turns off and doesn't restart. No flashing gren, nothing.

 

I tested the voltages on my wires and both the red and the blue show 24 volts ac to ground. 

So the device is getting power and it knows when it has been connected to the base plate but for some reason it will not restart.

 

 

Houptee
Silver Product Expert
Silver Product Expert

So You tested with a meter and put the red probe on the red wire,  and black probe on the blue wire, and you have approx 24V AC.

That should be good for the Nest to power on.

You have red wire in the Rh or Rc terminal? 

Try the other R terminal see if anything happens.

Peter_B
Community Member

Confirmed, with red on Red and black on Blue, 24VAC (same Red-Green, and Red-White).

I tried Rc as well as Rh when trying to get it to work yesterday.

Is there a way to force the device to report on its connections? When I try to run the Nest setup, all goes well until the setup needs a number from the device which I cannot get as it wont start up on base, and does very little when connected to a USB. Is there anything I can do if I connect it to a PC?

Houptee
Silver Product Expert
Silver Product Expert

Not sure what else to tell you to try it seems like you wired it correctly.

If you can get to the menu with it on the USB cable, that says "factory reset" maybe try that.

Hopefully one of the Nest reps will chime in and assist you.

Peter_B
Community Member

I contacted support and they helped me solve it as follows:

1) charge the unit using usb for another hour

2) disconnect the C wire and mask it off

Unit now restarts when connected to base and setup completed. Thank you all.

Jeran
Community Specialist
Community Specialist

Hey there Peter_B,

I'm just checking up on this thread, I'm glad to hear that support was able to help you out. In that case, do you have any more questions or need any additional help? 

Thank you for helping out on this thread, Houptee!

Best regards,
Jeran
 

Peter_B
Community Member

No all good now as soon as we figured that the C wire was unnecessary. Thanks all!

Jeran
Community Specialist
Community Specialist

Hiya Peter_B,

Sounds good! In that case, I'll go ahead and lock this thread. If you have any more questions in the future, feel free to create a new thread.

Have a good one!

Best regards,
Jeran