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I tried turning down the boiler stat & it did not seem to make any difference. Not sure how old the pump is. Over 4 years though. One thing I forgot to mention. The first hint I got that something was wrong, was that I got home from work the other day & the boiler had turned itself off via...

When starting from cold, the heating is OK. After being on for about 30mins or so, I start to hear vibration sounds in the pipes around the boiler. If I stop the pump, and re-start a few minutes later, I get a bang in the system. My boiler is a Potterton. Anyone know what's happening? I'm...