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OK. Fixed the problem. Once I sussed out how the system operates. Quite simple really. My heat exchanger was partially blocked thus not allowing full heat transfer between the primary to the hot drinking water. The exchanged was free enough to blow through but I did notice some black...

Ok chaps, had another look at the boiler. There is heated water from the primary heater going into the tap water exchanger at a constant heat but at the outlet the heat varies from warm to hot. There is also an audable click that sounds related to this. Would this be the diverter after all...

Yes it fires up ok and the hot supply goes through the exchanger. The hot tap heat is intermittent with a kind of swishing sound like the sea at the beach. My understanding of the system is that the central heating radiator supply is diverted through the exchanger to heat up the hot water...

Im very sorry its a 828E with white control panel.

Yes it gets very hot. Do you mean the CH flow? It gets hot and when the tap is turned on the heat goes through the exchanger and through the outlet.

Good day, Im having a bit of trouble with this boiler. It seems the Hot water supply to the shower and taps is not hot anymore and the plumer was a bit Vague as to what the problem may be. It seems Vailiant was not his preffered type of boiler. Ever since I can remember the shower...