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Ah thanks Ian! Would they check and sort this as part of a service?

Hi all! I have a Riva Biasi M90D Combi boiler. It heats a small system of 4 radiators, and has been in situ for at least 6 years (while we've been here), maybe as many as 15. When it powers on for central heating it sometimes does a 'false start', where all the three signal lights flash (a...