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Looks like I have it working. It seems there is a delay between the pump starting and the boiler. I turned water off on the nest so that I was sure that the water wasn't activating the water and then I turned up the temp on the nest. The pump kicked in and about 20 seconds later the boiler...

So I connected it up as per this photo and the boiler works for hot water but when I put the heating on it only starts the pump and not the boiler itself. I have set the water to permanently on in the nest software but still not dice. Are my connections wrong?

Hi Eric, Thanks for your reply. I think you are bang on. I managed to find this schematic in a Honeywell manual in paperwork left by the previous owner and I believe it matches your assumptions- Ian, no CH only activates the pump if the hot water is on. Thanks, I'll let you know how the...

Thank you Eric, this may be a stupid question but do you have any idea of how to translate my current Honeywell pins to the new schematic you have provided? Part of the problem with me relalizing it had been set up to C-Plan was that I am not 100% sure if I need to open up the boiler to grab...

Hi there, There isn't a wire going into terminal 4. That is a link wire looping from 5 to 8. There is also a link from L to 5. I don't see any signs of electronic valves and no thermostat on the tank. This is why it's really weird that the programmer appears set like c-plan. I didn't...

Hello Everybody, I just cost myself a call out trying to work out the heating system in my new house but oh well! I have an old Worcester boiler (oil fed) with a gravity fed system. So, I wanted to install a Google nest third gen and went into the Honeywell programmer expecting to see the...