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Many thanks to Fitz1 and ChrisR. Bar pressure OK but sometimes drops slightly and I top up. Looks like I need to call in an expert, but now I have an idea what the problem is they cannot take advantage of me and say I need a new boiler. Any good honest central heating repairers in the West...

Can anyone out there please tell me what the faults F24 and F47 mean. Is this something I can fix myself or do I need an expert? Any help appreciated.