Ariston Microgenus 23 combi boiler

Ariston Microgenus 23 combi boiler
My boiler recently developed a fault where I had central heating but no domestic hot water (stone cold). I was advised to fit a new diverter valve which I did.
The problem I have now is that I still have central heating but the domestic hot water only runs hot for 2 to 3 minutes then runs luke warm although the boiler is still fired up.
Does anyone have any suggestions what is causing this to happen?
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Lawrence Raybould wrote:

Flow switch?
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On Tue, 06 Jan 2004 12:20:57 +0000, Lawrence Raybould wrote:

1) Temperature sensor(s) out of spec? 2) Diverter valve letting primary water to CH during DHW mode.
I'm fairly sure this boiler does not have any sort of thermal store but otherwise the behaviour is exactly as it would be if it had.
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It has an electric diverter valve. It has a flow switch which detects flow and energises the diverter valve. Had the valve actually gone? The actuator can be changed, rather than the whole valve inc water section.
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