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Tony, I have turned of the cold as you suggested and tried all the hot taps and the shower and nothing comes out. Your advice makes the most sense especially as the divertor valve has been replaced is there anything else you can suggest. Thanks Anthony

Well, at this stage I'm just totally puzzled. Have replaced the seconday heat exchanger and the divertor valve but still have same problem. Luckily the supplier will take the parts back. I just can't understand why I get hot water at the kitchen sink but no where else. Two other sinks, a bath...

Yes the boiler fires up when heating off and a tap is turned on. But the kitchen sink is the only place I get hot water all other taps are cold. The divertor valve makes sense but I would have thought the hot tap at the kitchen sink would be cold also.

I have a very similar problem and was wondering if you can remember what fixed this for you.

Sorry, Had the boiler details in the subject line but must have been too many characters. Boiler is a valliant turbomax VUW242e.

Just recently my boiler won't heat the water in the bathroom taps or shower, the boiler fires up but the water is just slightly warmer than the cold tap. Hot water is fine at the kitchen sink. Today I played around with it a bit and noticed that the central heating flow pipe gets warm while any...