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Thanks chaps, A little search told me I needed to find a filling loop, which I did, and hey-presto I've got the pressure up a bit and it's working fine. We had a leak on a rad the other week, I guess that's where the problem came from. Re. servicing, yep I'm sure you're right, my home...

Last couple of Mondays (after a weekend off) I've had to re-light the pilot on our Vaillant Combi. Today I try to do the same and have no pilot light. It will not 'spark' and the whole boiler is making a 'pumping noise' which it wasn't before. The pressure is on zero, but has been for some...