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alpha boiler - hot water ok but only slight central heating ?????????

boiler is lighting and giving good hot water but the central heating is just lookwarm even after 3 or 4 hours running. system has been flushed and all air removed. getting cold in here?????
norrie, May 2012
either fault on diverter valve or valve moter
water is not circulation or strainer blocked on return fitting under boiler

k, May 2012