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Thanks for the quick reply, will try Ravenheat as not sure who fitted it - only moved in 3 months ago, Was told that boiler was new (ish).

Have a Ravenheat WhiteStat 29T Combi. Approx 6 months old. Since switching to winter mode HW & CH, have noticed that when running HW tap that get hot water for upto 20 secs then cold 5 - 10 secs then hot again & so on. CH works fine. Tried switching back to summer mode, ie only HW & still...