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thanks oilman I looked up blockages. and have solved the problem the 15mm section on the feed from the header tank was blocked gave a belt with a mallet seemed to dislodge some muck everything working fine now. :lol:

The morning started with the boiler banging away, so I went to focus and bought some fernox central heating restorer. It said drain the system and run for a week. So I proceeded to drain the system I attached a hose to the drain cock and the water began to drain away then it stopped . When I...