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So I’m working my way through this, I’ve removed the thermostat which originally connected between the brown and g/y with the red sleeve at the end of the connector. The black cable goes to the valve to the coil in the tank. The cable to the far right goes to the other valve and you can see the...

Thank you Stem, that’s really interesting. I’m going to go through the junction box and work out what goes where, mark them and then compare against the wiring diagram. As you said ultimately it’s just a selection of switches. NO or NC.

Actually it never worked on just HW but as I have two 2 port valves, one on the HW and one in CH I assumed I should be able to achieve HW only. It’s odd that if I flick that switch on the front plate to HW only when the boiler has cut in it will heat the HW only. But for some reason the boiler...

Thank you for your help, it’s up and running. Very pleased indeed. However I don’t have HW only for some reason. I can live without this though at the moment. That switch on the panel simply has two wires, white and an orange. Will try and track back to see what they do. Anyway thank you...

Thank you again, feel a lot more confident now and will install it tomorrow.

Thank you so much, yes makes more sense now. I’ve checked the stat and it only has one neutral and a live and a switch live. I’m guessing I can just link these together and lose the neutral. Ideally i would like to utilise the same wires at the stat removing them from the 240v feed and use as...

So how hard can this be I tell my wife, darling it might look difficult but it’s just a simple case of swapping things over. Or so I thought So I bought the Nest thermostat and heat link 3rd generation. Although I have a oil boiler it runs off a Honeywell programmer ST6400c, along with a room...

Thanks Chris, will check that tonight. If its the DV or DHW i guess i am going to have to drain the system down first, whats the quickest or should i say the best way in doing this as dont want to make matters worse with an air lock etc... Thanks

Hi Think i have the same problem as a few others previously. The C/H is fine as soon as i turn the hot water on it cuts out. If i try just the hot water it does not fire up. Sometimes with the C/H on and if i turn the hot water on it will keep on cutting in and out. I have read some previous...