Richard C
"A real plumber would never have a reason to use such a fitting. ??"
This is not a measured or considered response. It's a narrow minded put down. My comment is in direct response to it. So jump down off your high horse there Mr. Perfect.
As I said previously, consult the s plan wiring diagram, your controller and the boiler wiring instructions. If you're not able to or qualified to interpret these to acertain the problem. Enlist the help of an electrician who is familiar with central heating system wiring. Good luck.
For you to think my statement was based on naivety is condescending. In order for us to progress, we have to try new things. Sometimes that is difficult and sometimes it does not work at all. That does not mean for every step that falters we should take two back. Indeed it makes us strive for...
Simply..... No. That's a terrible idea on so many levels. For heavens sake, it's people who think like this that cause trains to crash and boats to sink.
A mixer valve requires a solid support. They do not require isolation valves and how in the world would you waterproof the tiling with a 200...
The commissioning instructions in the installer handbook will always tell you what the boilers minimum gas working pressure should be. The installer should have determined the pipe size requirement and fitted pipe to suite. If this was not possible, he should not have proceeded with the...
There's no reason you should not box the soil stack in nice and neatly as long as you don't put a screw through it? :) As far as insulation, it's not necessary. Maybe the previous occupier was trying to dampen the sounds of heavy turds banging the sides as they headed for the sewer????
Your pump may be faulty.
The heat exchanger could be scaled up.
There is air in the system.
There is a blockage in the system
These are about all your options.
Incidentally, if the heat exchanger is scaled up, power flushing will not help. You will need to isolate the boiler and clean it...