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:lol: Thanks for your replies good news is I now have DHW after replacing the Thermistor, my only problem now is that the CH & DHW keep going into overheat lockout. Could this be the pump over run thermostat that is causing this or is it the PCB that i am being quoted for. :shock:

please could someone advise as to why my Halstead Quattro Gold will not supply DHW The Ch works ok but when I turn on a HW tap the boiler will cut out if CH is running. we have had a problem for ages with the DHW cutting out. Last year the Diverter was renewed and since then DHW kept locking out...