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What's the Error 297 means, on my nest Thermostat ? Thank you.

HWC
Community Member
2 Recommended AnswerS

Ashepherdson
Platinum Product Expert
Platinum Product Expert

Yes so it's saying it needs a C wire, probably does not have enough power. The power adapter will help you out.

https://store.google.com/product/nest_power_connector?hl=en-GB

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Ashepherdson
Platinum Product Expert
Platinum Product Expert

If it's a new system then there should be an operations manual that came with it that will point you into the right direction for the C wire.  If for some reason you cannot locate that manual then the smartest thing to do is get an HVAC pro to install this for you.  You can also Google your model number for a diagram of where the c wire connection would be. 

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19 REPLIES 19

Ashepherdson
Platinum Product Expert
Platinum Product Expert

HWC
Community Member

Thank you, I bought  a Nest Power Connector, and I connected the two wires (1 Red and 1 White) going to the thermometer from the boiler, but now I need the common C wire coming from the boiler and I don't seem to be able to find it. There is no connection box or anything like that. This is a brand new 1-year-old 1 stage natural gas boiler. (WEIL-Mc LAIN) Any suggestions ? Thanks again.

 

 

HWC
Community Member

My system has only two wires (W and R)

Ashepherdson
Platinum Product Expert
Platinum Product Expert

Yes so it's saying it needs a C wire, probably does not have enough power. The power adapter will help you out.

https://store.google.com/product/nest_power_connector?hl=en-GB

HWC
Community Member

Thank You So Much.

I too am seeing the e297 message, but I have already installed the Google Power Connector. Why would I receive this message after installing the connector? I also cannot connect to my WiFi 

I have the adapter but still get the E297 error

any progress on this? I just installed my power connector and having no luck at the thermostat 

Jake
Community Specialist
Community Specialist

Hey sgarapolo,

 

Sorry for the late reply. I wanted to follow up and see I could be of any help. 

 

If you're installing the Nest Power Connector and you get an E297 help code, your thermostat needs an update. On the thermostat screen, select Settings, Software, then Update.

 

If you’ve already installed the Nest Power Connector, you might need to update the wiring info in the app. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

sgarapolo
Community Member

Thanks, Jake! It turned out that "install the power connector at the zone valve" meant to connect it on the thermostat side of the zone valve, and not after it at the boiler. I saw that but I glossed over it! 

Jake
Community Specialist
Community Specialist

Hey sgarapolo,


I am glad to hear you were able to get the issue resolved. Please let me know if you have any questions from here, as I will keep the thread open for a couple of days to ensure everything is working properly from here.

 

Best regards,

Jake

sgarapolo
Community Member

Just yesterday, after I sent this message, my thermostat went offline and reported that same power issue. Google then emailed me with an offer for a free power connector. Nice, but, odd, right? 

Jake
Community Specialist
Community Specialist

Hey sgarapolo,


I am sorry for the confusion, and to hear about the trouble with your device going offline. Are you able to double-check the thermostat and ensure it is being powered by the Nest Power Connector? I also did find an article with some troubleshooting steps for the Nest Power Connector. Please let me know if that helps.

 

Best regards,

Jake

Jake
Community Specialist
Community Specialist

Hey sgarapolo,


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

Best regards,
Jake

Jake
Community Specialist
Community Specialist

Hey sgarapolo,


I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity.

Best regards,
Jake

CaptainJeff
Community Member

Talk about error codes - I'm dealing with the N72 error.

Purchased Nest Learning to control both Heat (boiler) and AC (older system) in New England.  Installed 1 Apr 21.  Used heat and AC through mid June before transitioning to summer AC.  While getting ready for winter on 6 Oct 21, turned on heat and controller in TACO box (interface between thermostats and boiler) just kept clicking.  Called HVAC Co for PM and troubleshooting.  No issue with boiler.  Nest giving N72 error - no power to heat Rh wire (not true).  Tech bypassed thermostat and started boiler.  Contacted Nest - given unbelievable run around, including sending part that they knew wouldn't fix it.  Contacted again today (10-29) and given same run around.   Won't acknowledge problem or propose solution.  Blames me.  This is a common problem and not unique.  Save the hassle and buy another brand.  You can thank me later.  

HWC
Community Member

Thank you, I bought  a Nest Power Connector, and I connected the two wires going to the thermometer from the boiler, but now I need the common C wire coming from the boiler and I don't “seem” to be able to find it. There is no connection box or anything like that. This is a brand-new 1-year-old 1 stage natural gas boiler. (Weill Mc LAIN) What do you suggest ? Thanks again.

 

 

Ashepherdson
Platinum Product Expert
Platinum Product Expert

If it's a new system then there should be an operations manual that came with it that will point you into the right direction for the C wire.  If for some reason you cannot locate that manual then the smartest thing to do is get an HVAC pro to install this for you.  You can also Google your model number for a diagram of where the c wire connection would be. 

CaptainJeff
Community Member

I have the same brand of natural gas boiler.   Pg 27 of my manual says to use an isolation  relay coil for three thermostats.  My current C wire is from the AC.  Supposedly, the relay coil on the boiler would provide voltage to the Nest to correct it giving the n72 error.  TBD.  Need to talk with heating maintenance contractor.  Bought analog Honeywell today so that I can have heat (and AC, although Nest would operate the AC).