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On an Ideal Isar, when the central heating is on, if the boiler displays "d" meaning there is a demand for hot water (when theres not, no dripping hot water taps either) , does it mean the diverter valve needs replacing? The boiler is three years old and intermittently heats the hot water...

Hi, anyone know much about Ideal Esprit 2 boilers?? Specifically why, when the hot water switch is selected to be on, the tap signal lights on the built in programmer and the central heating comes on. No radiator symbol light comes on however but everything runs and flow pipe starts...