My heating system runs through a Drayton Lifestyle Dual Channel Programmer LP522. Recenty when I selected the Hot Water Only the radiators also heated-up.
More recently when I selected the Hot Water Only the water stayed cold but the radiators heated-up. I'm confused ?????

Dave Symmonds, September 2009

you will have a three port valve somewhere on your system which diverts the heated water from the boiler to the rads & hw this could be faulty (stuck in heating open)so when you put hot water only it flows through heating

pheva, September 2009