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Hi back in February I had a bit of bother with my 11 year old Alpha combi boiler.A new diverter valve and motor,new PRV and condensate pipe were fitted and all was well.This week for the first time since, I,ve had to top up system via the loop,it probably took about a thimble full to get it back in the green band(yes it was that little) Would/is this acceptable or is the start of more problems.TIA.