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Thanks stem My error with the picture - I thought that was a picture of the existing Honeywell wiring Thanks for confirming the wiring - we will have a go at this at the weekend

Hi I have a Honeywell sundial programmer and wireless thermostat model no st9420c on an s plan system I am about to change it to a nest3rd gen learning thermostat and just wanted to understand which wires need to go where I know I will be told that I need to a qualified electrician and I...

Thanks I didn't open a room sealed boiler There is a junction box with the timer that all the wires go into and it is that cover I removed to check As you say if Advice can't be offered I can ask the guy to come back

yes I think that's the best option - was just hoping there was a quick answer then I could have to avoid dealing with any more muppets altogether

As I said there were two of them and they did the job fine but the lesser experienced one did the wiring for the programmer whilst getting advice on the phone from his partner who was unable to come and finish off the job on the last day and was the one who apparently usually does the electrics...

Hi I have not done the job myself it was done by qualified gas safe engineers which I found on Checkatrade but they took a while to figure it out which surprised me and also initially the heating wasn't working so they looked at the diagram again and then reconnected the wires The main plumber...

I have had a boiler installed recently ecotec vaillant 637 and I was checking the wiring after as the plumber wasn't overly confident when doing it All looks ok but on the wiring instructions attached for the Honeywell programmer, from the boiler it shows a separate boiler and pump. the earth...