Nest heat link

[Ady]

We are installing a nest thermostat and heat link when we power on  we can use the stat to bring heating on and off and when rooms are up to temp heating is switched off. My problem is that as soon as I turn power onto the heat link it closes the N/O contact for water without being called at the thermostat 

any advice welcomed 

[DragosC]

Hi there @Ady, 

Thanks for reaching out. Depending on the type of heating system that you have, the wiring needs to be accordingly to the installation guide here: 3rd-gen-Nest-Learning-Thermostat-Install-Guide-UK.pdf 

Also, if the hot water relay is the one that's constantly closed, most probably the bacteria prevention feature is active. You can learn more about it and how to turn it off from here: How the Nest thermostat helps prevent Legionella bacteria 

Let me know if you need more help. 

[DragosC · Accepted solution]

Hi there. I'm just following up on our last message. Do you still need our help? Keep us posted. 
 

[AlexD]

Hey there, I haven't heard from you in a while so I'll be locking this thread. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community. Thanks, AlexD.