Hi Stem,
Thanks for the reply - glad to hear the Nest wiring looks correct! I haven't removed the Honeywell room thermostat or receiver. Its still in place with the thermostat turned to max. I didn't want to remove it until I was sure the Nest is wired up and working correctly.
Before fitting...
Morning all,
I was hoping somebody could help me with a Nest 3rd gen installation please? My problem is that the Hot Water comes on with the Heating, even when it's set to off from the app.
My set up was:
Boiler: Vaillant EcoTec Plus 630
Tank: Megaflow 210l
Programmer: Honeywell ST9400c...