Recent content by Colm C.

I decided to connect a light bulb to Terminal 6 and the Neutral terminal and the light only came on when I had the HW schedule set to ON. Your theory about a ghost voltage was correct! Many thanks for that. I'm now good to go. I didn't want to undo the existing system until I was confident...

It's pumped straight off the boiler to both the CH manifold and the HW cylinder.

I have a Grant Vortex Condensing Boiler connected to a Systemlink manifold with 4 heating zones (two of which have Nest thermostats connected). I want the new Nest to control the third heating zone and the HW control in the app to switch the boiler ON/OFF. I want to be able to remotely turn on...

I was just testing my wiring before I installed the heat link and thermostat properly. I was testing terminal 3 and 6 with a phase tester. Terminal 3 will be connected to my heating zone pump and I was intending to connect terminal 6 to the boiler but I was surprised to find that terminal 6...

I want my new 3rd Gen. Nest to control both a heating zone and the boiler itself so that I can remotely switch it on/off. The heating is working fine (terminal 3 comes live as the heatlink calls for heat) but terminal 6 on the Heat Link is permanently live and does not switch when selecting Hot...