No, that is what we would expect to see if it is connected to the thermostat, a solid green light. If it was disconnected we would only see a orange or blinking blue LED.
In this case, let us next to a test, when you can go to the Heat Link with the Nest app on a mobile device.
1. Make sure the heating is set to be off, display black.
2. Turn up the temperature until the display goes orange, heat on, and listen for a clicking noise from the Heat Link.
3. Turn the temperature back down until the display goes black, heat off, and listen for a clicking noise from the Heat Link again.
We want to check how the internal relays are behaving, let me know if they make the clicking noise.
Also, after, try pressing the button on the Heat Link. Two additional green LED lights should come on, that is the manual mode where both heating and hot water relay is activated. Listen for a click and see if the boiler has any reaction when putting it in manual mode. To take it out of manual mode just press the button in the middle of the Heat Link again.
