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hot water and CH come on together when only one required?

my hot water and central heating comes on together when i only want one on i have a potterton back boiler what could it be
smith, September 2010
thanks Byron, would i have to drain the system down if so how i am thinking of getting new motor with it just in case it's a bit "dikki"

smith, October 2010
3 way diverter valve in the cupboard where your cylinder is located you may only ask for hot water but the valve may be jammed in the middle sending water to the radiators as well as your hot water

universalheatingsparesuk byron, October 2010
link Click here to see other fixes for Potterton.