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Thanks for your reply but we are only an ordinary couple who need to use a plumber so we have no idea what a multimeter is :(

We have had this boiler about 5 years. Last year we had a problem in that when the water and heating came on together in the timed mode, after half an hour the heating goes off. We have had two new three port valves fitted and the plumber has been back numerous times (albeit obviously 'fitting...