Nest thermostat losing power

[Bgray1]

Hello all. I am having trouble with power on my nest thermostat. I had tried the nest power connector at first. I still received a warning of low or no power and it killed the batteries in just over a week. It wouldn’t measure over 20v even when hooked up with the 24vac connection post on the furnace. Yesterday I decided to run a 3 wire tstat wire, with a dedicated C wire, to see if that would fix the problem. The nest still has an equipment error. Now when calling for heat, as soon as the furnace kicks on, the nest says “no power” and reboots. Which turns the heat back off. 

[Markjosephp]

Hello Bgray1,

Thank you for taking the time to let us know about your inquiry. I'd be happy to take a look at this for you.

Could you please share with us a photo of how you installed your Nest Power Connector and your thermostat's wiring? Please gather the power readouts on your thermostat's equipment settings. Also, make sure that your thermostat's software is up-to-date.

Thanks,

Mark

[Markjosephp]

Hey there,

I wanted to update this thread. How's it going? Have you had a chance to check the things I need above? Please let us know if you have any other questions or concerns.

Regards,

Mark

[Bgray1]

My apologies. I have not had a chance to gather the information you requested yet

[Markjosephp]

Hi Bgray1,

I understand. No pressure! You can reply anytime on this thread, and if you have additional questions or concerns, just let me know.

Thanks,

Mark

[Jenelyn_O]

Hi there,

I wanted to follow up and see if you still need help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

I appreciate your help @Markjosephp.

Best,

Jenelyn

[Jenelyn_O]

Hi there,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Best,

Jenelyn

[Bgray1]

Yes sorry. I have seen your response. I haven’t time to gather the pictures and measurements that were asked for. The thermostat has running on battery power for now. I’ll update when I get a chance to look at it again

[Jenelyn_O]

Hi Bgray1,

Thanks for the update. We want to make sure that everything will be taken care of —  I’ll keep this thread open and wait for your update.

Best,

Jenelyn

[Jenelyn_O]

Hi Bgray1,

I wanted to follow up and see if you still need help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Best,

Jenelyn

[Bgray1]

Hello. I am looking over the thermostat wiring. I double checked all of my connections. They are correct. I appear to have a voltage drop of about 4 volts from my power connector.  My 24v connection on the furnace is reading about 26v and the red wire that leads to the thermostat is only reading 22v at most. The nest only shows 19v to 22v on the display. I attempted to upload photos but I’m not sure how on my phone. 

[Bgray1]

 

 

[Bgray1]

 

 

[Bgray1]

I did just notice that when the heat is turned on, the thermostat reads 26v. When the heat demand is turned off, the power level returns to 22v

[Bgray1]

Any thoughts on this? I am still having power warnings.

[Markjosephp]

Hello there,

Thanks for assisting, Jenelyn.

I'm sorry for the late reply, @Bgray1. I know it has been a while, but I wanted to ensure that everything was covered here.

Could you try moving the wire from the 24V to the common terminal on your control board, as shown in the picture you posted with your Nest Power Connector? Please turn off the power to your HVAC system at the breaker box before making changes. Also, restart your thermostat to refresh.

Let us know how it goes.

Regards,

Mark

[Bgray1]

Hi Mark. I did try connecting to the common post already. When connected, the nest was showing 0 volts. And gave a warning of power failure 

[Markjosephp]

Hello Bgray1,

Thanks for keeping us posted. Please try resetting your thermostat to default. This will clear all the configured programs that was set and proceed by adding them again to the Google Home app.

Please let me know if that helps or if the issue still persists.

Regards,

Mark

[Markjosephp]

Hi there,

I'm checking back in. Were you able to reset your thermostat? I'd be glad to hear from you — I'd like to make sure everything is working.

Regards,

Mark

[Bgray1]

Hi Mark. I just reset the nest to factory default and attempted to connect to my Google home app again. I am running into the same problem. I told the setup assistant that I installed a power connector when it asked what wires I have. When it got to the power test step, it is still saying low power. And suggesting connecting a nest power connector

[zoeuvre]

Hi everyone, 

I wanted to stop by and see how I could help.

@Bgray1, a few questions: How many Nest Thermostats do you have? And, did you connect the Nest Power Connector to the right zoning system?

I'll look forward to your response. 

Thanks for the help here, Mark and Jenelyn.

Best, 

Zoe

[Bgray1]

I have one nest and three zones. Yes it is connected to the correct zone