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hi all, got a really irrittating problem with 2 new large tall column rads that I've installed onto an existing system - combi boiler vaillant 30kw. The problem is they don't heat up the rest of the rads on system work fine including a small column rad in the same room as these two! if I turn...

Hi I'm a registered gas safe engineer, about 3weeks ago I changed a diaphragm on a diverter valve in a Halstead sime trio due to no dhw, worked perfectly! Now I've been called back to property as boiler won't fire up! It goes through the start up sequence but never fires! There's gas upto the...