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Ravenheat combi RSF 84E what's going on?

Just moved address and now got Ravenheat combi. Everything appears to be working, firing up ok, no problems with heating BUT when I need hot water at sink or bath, it comes out hot then goes cold, then goes hot, then runs cold etc. Consequently I am washing up and bathing in lukewarm water. The boiler has been repressurised a couple of times. The bar reaches 2 when heating on and then falls to 1.5 when cold. Any ideas?

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Ravenheat combi RSF 84E what's going on?

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