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Hugh Many thanks again for your reply As for the past few years, before I moved into the house, I dont know if it had x100 in it or not. I flushed the system then added x400 for 4 weeks and now have x100 in again. When I flushed after the x400, it removed loads of black sludge and dirty...

Many Thanks for your reply I will consider your view Thanks again

Any views experts?

Many thanks I will order both and see which is better

Have done some more internet browsing and believe this one could fit? Siemens (Landis & Staefa) RWB29 Programmer

Thanks London The CH and HW can work independantly however I have the programmer you suggest and the backplate is different i.e. I need a backplate which is square in shape and the pins stick out from the backplate and the female contacts are on the programmer, not the other way around...

Thanks London The CH and HW can work independantly however I have the programmer you suggest and the backplate is different i.e. I need a backplate which is square in shape and the pins stick out from the backplate and the female contacts are on the programmer, not the other way around...

Hello I have recently had my Dansmoor 32/50 oil burner (discontinued in 2001 model) serviced and it is running well at 93% efficiency. Great! I was chewing the preverbal with the heating engineer and I mentioned that is took me ages to refill the system after I fitted two new rads...because...

Hello My sister in law' programmer has given up. The timing wheel has stopped working however you can still manually turn CH and HW on. I believe I can make a straight swap with a new one if the backplate is the same? Can some please identify the old programmer please and advise which new one...