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Baxi 80E Hot Water Call Triggers Central Heating

Postby paganada » Sun Aug 12, 2018 3:39 pm

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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