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 and the preasure drops all the time. I have reset the preasure but it always drops to zero Please could someone advise if this is a diverter problem again as dont want to pay £400 for plumber again