Thermostat won’t connect to boiler

[Philip1914]

Hi I have nest thermostat 3rd gen everything was working fine until we had a rat eat through power cable at the boiler got this problems fixed but nest thermostat won’t connect to boiler !livening in southern Ireland  It looks like everything is running connection to Wi-Fi works when you set setting temperature on nest it looks like it’s working but it’s not communicating with boiler !!!! Any suggestions would help please

philip 

[DragosC]

Hi there @Philip1914, 

Thanks for reaching out. Could you tell us please what is the color of the LED on the Heat Link? 

[Philip1914]

Now it is solid green 

[DragosC]

Understood, thank you. Does the manual mode work? When pressing on the button of the Heat Link? 

[Philip1914]

Yes manual works 

[Philip1914]

On screen manual works but does not connect with boiler 

[Philip1914]

Also I have factory reset heat link still not Communicating with boiler

[DragosC]

Understood, @Philip1914, 

Thanks for letting me know. Before following these steps make sure of the following:

- The thermostat is connected to the base and to a power source and it's getting power (You can check in the "Technical info" option, and after that in "Power", the battery needs to be above 3.8 in order to maintain a constant connection with the Heat Link, however, if it's not, let it charge until it is).
- If you have the possibility (the thermostat is on a stand), bring the thermostat and the Heat Link as close as possible only for the pairing process, after that, you can move them anywhere in the 30 meters radius

1. Gather the 6-digit entry key located on the bottom side of Heat Link's case, near the screw that holds the case together.

2. Select the option "Replace Heat Link" on the thermostat (you will have a message saying that the thermostat failed to connect wirelessly to the heat link, you just need to continue and you will receive a screen with 4 options: check again, reset pairing, replace heat link and technical info, the correct option in the third)

3. Put the 6-digit entry key in there but don't confirm it. Just write it there and stop when you see the word "Connect" highlighted.

4. Press the "Nest" button on the Heat link and hold it for 45 seconds until you see a slowly pulsating blue light on the Heat Link. After that, wait about 5 seconds and press and hold it again for another 45 seconds until you see a slowly pulsating blue light on it.

5. Go ahead and press connect on the Thermostat's display and wait about a minute. You shall see the message "Heat link connected wirelessly" and the Heat Link's light shall be solid green. That means the devices are connected and working.

[Philip1914]

hi & thank you for the information you sent their is no number on heat link case but I found entry code on thermostat is this the 6 letter code you mean ? 

[DragosC]

Got it. Could you tell us please what type or generation of Nest Thermostats you have? 

[Philip1914]

 

 3rd Gen

[DragosC]

So this is a second generation Nest Thermostat. Thanks for letting me know. In this case, you can find the code for the Heat Link in Settings > Technical info > Heat Link. 

[Philip1914]

Just another question 

would it be possible to get a replacement heat link for 2nd gen as this one seems to be faulty & if so could you please point me in the right direction as to we’re to purchase above ? Thank you 

[DragosC]

Unfortunately, the second generation thermostat has been interrupted since 2018, we don't produce them anymore. Best I can assist you with are troubleshooting steps, but no one can replace it. 

[Philip1914]

Ok thank you 

can you give me an idea of cost to replacement thermostat 

here in Ireland 

[DragosC]

You can check the Google Store page for Ireland here: https://bit.ly/3HUFB8w

[Philip1914]

Again thank you for all your suggestions !  unfortunately could not fix ! So my question is if I purchase a new thermostat 3 gen can I use older model with new thermostat 

[CristianC]

Hey @Philip1914. What do you mean by using an older model with the new thermostat? Your new thermostat is going to come with a new Heat Link. The 3rd generation thermostat can't be linked to the 2nd generation Heat Link. I'm hoping this answers your question. 

[Philip1914]

The question I asked is can the two thermostat 2nd & 3rd Gen be used on the same heat link !  As even tho the one 2gen heat link I have installed at the moment is showing no fault but in not communicating with boiler ! So if I purchase a New thermostat could they both be used on the same New  heat link ? That was my Question & thank you for the update information I do understand that both can’t be used together!!!! 

[CristianC]

Hey @Philip1914. Each thermostat should be connected to its own Heat Link. The 3rd generation thermostat can't be connected to the 2nd generation Heat Link.

[Philip1914 · Accepted solution]

Finally Closing this tread Just to let you know through trial & error finally sorted out this nest thermostat as I said in the previous email one of my friends suggested  the relay switch might be stuck !! So I continued to try resetting the heat link to factory setting & in doing so it released  the relay switch thank you  as I have said above thank you for all your suggestions with this also saved paying for a replacement thermostat

[AlexD]

Thanks for keeping us posted. I am happy to hear it seems to be back on track. If anything else comes up, make sure to let me know or to reach out to us on any of our channels. 

[DragosC]

Since there is no further reply on the thread, I'll have to close it. Should anything else come up, please open another thread and we'll take it from there. Have a good one and stay safe!