Baxi 80E Combi. When boiler switched to hot water only, call for hot water works fine. When boiler switched to Central Heating & Hot Water position, and hot water is turned on the diverter valve opens both hot water & central heating (circulation pump switches on) for the duration of hot water running. Have changed the PCB, Diverter Valve, DHW Thermistor temperature sensor & Safety thermostat. Have followed same sequence with room stat on & off, and also with timer isolated, all with the same result. Someone suggested the Plate Heat Exchanger, which I removed, looked OK, and refitted, couldn't see how it would correct my problem! Any ideas would be much appreciated.
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