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Heating Home Heating Systems?

My Bosch Worcester 40 CDI has a problem the water isn't getting that hot but the radiators are working fine and the water keeps cutting out when you run a bath with the hot tap you get the 'E9' and then I reset but the water isn't getting nice and hot, lukewarm and the 2 sidways T's flash. Help.
Rabsab, October 2012
Hot water heat exchanger is blocked

ltd, October 2012
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