thanks again chris ive printed off the diagrams for the engineer 2 look at if he's not ofay with this boiler. i know my diy limits and this is above it!
i have recently moved to to house that has a chaffoteaux & maury britony combi boiler. last night i shut down all but one rad valve to see if i could get heat to a bedroom radiator it didnt work so i opened up all rad valves now the boiler is making a droning sound and the re is no c/h or hot...