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Many thanks for your reply, it is very much appreciated. I have printed off all your info and will let you know if it all works out OK. John

I will be using the Sunvic Select 207XL programmer, Sunvic SA 1452 cylinder t/stat and the Sunvic TLX 4101 room t/stat. The 3 port valve is standard colour wiring I assume so wouldn't matter which I bought. I would appreciate any more help with a wiring diagram as you suggested previously...

You're right about it being Heath-Robinson. It must have been installed by a real cowboy! It is my son's house which he has only recently moved in to. You asked about the room thermostat, but again there isn't one, I will instal that together with a cylinder stat which is also lacking. Once...

sounds like I will need to buy a new programmer. At present there is a 3 way valve installed in the pipework but there is no electrical unit fitted to it. I was going to replace this with a new 3 way valve and wire it in. What programmer would you suggest and how would the wiring be...

Thanks for all your help. I am using a Switchmaster 300 programmer which I believe is Drayton. The pump, HW cylinder and all associated wiring are all in the airing cupboard as well as the boiler and programmer so changing any wiring would not be a problem. The main switch is also in the...

Many thanks for your replies. I have looked at the Honeywell site Y plan wiring diagram but can't work out how to wire it in to the Apollo 40 wiring block in the boiler. The wiring diag for the Apollo 40 can be found at www.partsarena.com/baxi/System/index.htm? John

I want to instal a three-way valve to control the H/W and C/H to this boiler but am unsure how it needs to be connected into the boiler wiring. I want to use a Y plan system. I would appreciate any help or advice anyone can give me on this. :?