I have a Worcester 28CDi Combi boiler which has stopped supplying hot water on demand when the hot water tap is turned on. The light for hot water does not light up. The heating is unaffected. The manual suggests (fail point E) that a new control panel board should be fitted. If however I want hot water I can switch on the heating and then hot water arrives although the hot water light remains unlit which perhaps is a valve problem
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