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    Worcester 15/19, CH comes on when only DHW should be on

    Can someone please help. I have a Worcester Heatslave 15/19 Oil combi boiler. When I select the DHW only, it runs the central heating as well!! When I select CH only, the boiler will fire up and run for 5 or so minutes and then switch off, during which time the circulating pump has not come on...
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