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Thanks. I will give that a go tonight.

Thanks for the reply but theres a bit more to it than that. We are talking about a system that I fiited myself 17 years ago without any faults since. Its now getting large amounts of air in very quick time. The faults seem to indicate some sort of sludge blockage but what doesn't make sense is...

I have a conventional CH system. CF boiler with 8 rads and gravity fed hot water tank which has worked problem free for many years. Last week I heard loud noises from my pump which appeared to sound like air in the system. I checked the rads and found 3 with a lot of air in. I have checked...