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I have a fully pumped un-pressurised system with 12 radiators. The pump is Grundfos Super selection, and the Glow Worm Boiler is an Ultimate model. The diverter valve is a Lifestyle mid position valve.

My system is About 10 years old. I drained the CH system about a year ago. To fix a leaking radiator valve. Upon refilling the system, eliminating all air from the system I switched it back on. Initially the system worked fine. But after about 2 hours there was a noise coming from the boiler. I...