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Job done and pleased to say problem solved. Yeah, the earths looked a bit messy to me too but not being a pro I went with it! Point taken with the yellow and green sleeving. Thanks for all your helps guys. Next time i'll read the instructions properly!! Cheers

@ doitall : you are a genius. And I look to be a bit dense!! I didn't see that in the diagram. I just looked at all the brands listed and didn't realise that the Siemens at the top wasn't just a continuation of the list. Sorry. Gonna give it a crack now. The wires are for HW, CH and...

Gents, I've taken a photo of the wiring diagram for the RWB29 below of which I've followed to a T. @ doitall: based on what the wiring diagram shows what harm would be done if I hooked up the htg to T4 to try it as T1 is obviously not doing what it should. Please also see the wiring of...

Sorry, my terminology may be a bit off. The pump is humming a little, which though it may be old and decrepit, it stills seems to work as I have just put the old controller back on and switched onto constant and everything works fine. CH kicked in and HW on too. I'm just confused as to why...

I have just replaced a Switchmaster 600 Controller with a Siemens RWB29 Controller, but for some strange reason I can't get any central heating to kick in. I have wired the Unit correctly as per the instructions but when I switch the Unit on to CH or HW Manual, it ignites the boiler and then...