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Too late on the wire brushing TheDec, however I am not wire brushing the underling material so much as using it to remove the existing flakes and smooth what will not come off (see pictures) Pretty certain it is not natural stone or sandstone, looks like plain old concrete to me.

Hi I am repainting my exterior masonry window sills. They were very flakey, however the flakes are loose in places, at least 50% would be very hard to remove, more like 90% on some sills. So I have wirebrushed it down to a smooth as possible surface where possible and removed the stuff...

Again many thanks Mandate and matt1e. I will try and get some photos. Everything you say mandate makes sense, I have very little electrical skills/knowledge but what you describe is logical. When I say 'move across' I do mean from the mid / CH positions - as these are working fine and you can...

Before we had a Drayton TA/M4 actuator. Now we have a BOSS BMPV222, 3 port mid position valve. Looking at these posts which have the same model - is it possible that the valve is wired the wrong way around, or that what I have now is not compatible...

Thanks for the replies. Dan_Robinson / Agile - It certainly does still seem to be pointing to the electrical side of things - but as I said 2 separate electricians have confirmed it is ok on that side of things, it is wired correctly and the programmer is working - do it get a third...

The order of how things have happened: 1) The motorized valve would produce a really loud knocking sound unless both CH and HW were calling (e.g so it had to be in the middle position or else the knocking noise occurred) 2) Plumber identified that the motor was broken in the valve and...