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How can I fix Jaguar 23 boiler?

I have a Jaguar 23 combination boiler. If I take a hot shower the water is nice and hot. If I turn the shower off and then turn it back on the water is cold.
Radiators and normal use of hot water does not create this problem.
Any help would be appreciated.
John, April 2010
heating working no hot water diverter valve moving micro switch clicking on and off no light on tap symbel no f4 showing

mr jon swift, January 2011
link Click here to see other fixes for Ideal 23.