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vailant 242e turbomax and the temp keeps fluctuating?

My central heating is working fine. But everytime we use the shower or the bath tub the water temperature keeps fluctuating from warm to hot. I have changed the water pump and the diverter valve but the problem still exists. can anyone help me with this?
zuber, December 2009
Plate heatexchanger inside boiler looks like silver plate is full of sludge thus stop heat transfer to water thus this happen

Mr K, December 2009
link Click here to see other fixes for Vaillant 242e Turbomax.