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Mend Drayton LP522 Radiators Heating Programmer

My Radiators heat-up when I have Programmer set to Hot Water Only?

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
DraytonDrayton LP522Heating, Home Heating SystemsRadiators Heating Programmer
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

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Drayton LP522 Programmer - Radiators Heating with HW Only