topic Re: N260 message in Nest Thermostats

N260 message

Sjpunome — Sat, 04 Mar 2023 18:59:27 GMT

I have gone over my wiring dozens of times and it matches the installation schematic for “heat only” in the c wire adapter instructions. Yet I still get the N260 message constantly. I’m guessing it’s just that the unit isn’t getting enough power because it won’t turn on as I approach (non essential function). Is it possible my system just doesn’t put out enough power and I’m totally sunk?

Re: N260 message

Patrick_Caezza — Sun, 05 Mar 2023 04:14:04 GMT

Post a picture of the original thermostat's wiring and one of how you wired the thermostat and power connector.

What type of Heat Only system do you have?

Does it have a C terminal?

Re: N260 message

Sjpunome — Sun, 05 Mar 2023 04:36:23 GMT

@Patrick_Caezza I don’t have a full before and after. I could send you something useful bit this is saying I don’t have permission to upload images. Not sure how to get you the images unless it’s through direct email.

Re: N260 message

Patrick_Caezza — Sun, 05 Mar 2023 04:40:59 GMT

You need to reply on the website and click on the little camera icon at the top of the reply window.

Re: N260 message

Sjpunome — Sun, 05 Mar 2023 04:47:25 GMT

@Patrick_Caezza
I have a gas powered, radiator (baseboard) system. At the thermostat only a white and red wire that obviously went to the W and Rh terminals. There is only an R terminal on the nest so it’s in there.

at the board at the outgoing terminals they are numbered 1-4. Green, yellow, brown, blue in order. From the c wire adapter for the incoming terminals I have the red wire and the “r” wire and white wire and “w” wire clipped into the splicer. Then I have the white colored wires from the adapter going to R and W on the board at the incoming terminals and the c wire going into terminal 4 with the blue wire already there.

Re: N260 message

Patrick_Caezza — Sun, 05 Mar 2023 04:58:17 GMT

It doesn't sound like you have the power connector wired correctly.

Can you post a picture of the terminals at the baseboard system connection point?

What is the manufacturer and model number of the baseboard system?

Re: N260 message

Sjpunome — Sun, 05 Mar 2023 04:59:02 GMT

@Patrick_Caezza

I don’t get a camera icon in the reply window. Maybe these will be viewable.

https://share.icloud.com/photos/0765ana_i6EIlDadXHTrkkoKA

Re: N260 message

Sjpunome — Sun, 05 Mar 2023 05:08:44 GMT

@Patrick_Caezza

https://photos.app.goo.gl/Kr7xochzKcL6N85fA

can you view those I hope?

Re: N260 message

Patrick_Caezza — Sun, 05 Mar 2023 05:25:09 GMT

Those are perfect.

The bottom row of terminals is for the valve relays, and you don't want to use them.

The top row of terminals is for the thermostats, and each zone has a connection for W, R, and C.

From the looks of it, it appears that you have several wires in each thermostat cable. If that is true, then you can use one of the spare wires (blue) and connect it to the C terminal on the controller and the thermostat.

You shouldn't need the power connector.

Re: N260 message

Sjpunome — Sun, 05 Mar 2023 06:15:00 GMT

@Patrick_Caezza Ok I took the adapter c wire out of the bottom row and put it into the top row empty c terminal and that seems to have worked…no error messages now and the unit lights up as I approach. Checked power on the unit and it’s

VIN: 32.435V

lin: 385 (W)

PS: W-385, WP - 18

Re: N260 message

Sjpunome — Sun, 05 Mar 2023 22:55:49 GMT

@Patrick_Caezza

thanks so much for your help last night. The c wire in the c thermostat terminal works great. As I’m sure people often ask your advice, I came across a Reddit string where someone had called Taco and got their input. Taco says to put the c wire from the adapter into valve control terminal 1 (green). This controls the fan. But in a heat only, gas / radiator set up there is power sent to that terminal which can be used, and it’s never going to be a problem. I tried that today too. It worked great for a while then both units went powerless on me so I switched back. But I feel like my system is janky and that might be an option for someone down the road. Just letting you know in case you want to suggest that to someone.

Thanks so much for your help. All good. - Steve

Re: N260 message

Markjosephp — Sat, 11 Mar 2023 20:41:06 GMT

Hello folks,

I wanted to ensure you were good to go.

Thanks for your expertise here, @Patrick_Caezza. Big help!

@Sjpunome, I'm glad to hear the issue with installing your Nest Power Connector was sorted out with the help of our expert. Hats off to both of you!

It looks like we can consider this one complete, so I will lock the thread within 24 hours unless I can help out with anything else.

Regards,

Mark