Discuss Knocking on pipes when heating starts in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Every time the heating comes on there is a knocking sound from the pipes that lasts 15-20 minutes, then intermittently while the heating is on. Only started over last 4 months. System / house 5 years old. Knocking/banging pipe noise always from same place. Why and what can be done?
 
Every time the heating comes on there is a knocking sound from the pipes that lasts 15-20 minutes, then intermittently while the heating is on. Only started over last 4 months. System / house 5 years old. Knocking/banging pipe noise always from same place. Why and what can be done?

It could be trapped air/hydrogen build up (from sludge). Best getting a heating engineer.
 

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