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boiler knocking

View the thread, titled "boiler knocking" which is posted in Boiler Advice Forum on UK Plumbers Forums.

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Leadbetters

Hey does anyone know why this raven heat has started knocking,not all the time but is knocking.
I thought gas pressure but aint, then pump any ideas
 
Do you live in a hard water area? If so, the knocking is probably kettling due to the heat exchanger furring up. Adding Sentinel X200 will reduce this.
 
Would help to know mode; details leadbetters?? Knocking on hot water heating or both? etc...etc...🙂
 
Soz my previous post should have said "model" details 🙂

Is it a combi? AND is it heat or hydraulic related? If you extinguish the heat source does the knocking disapear?
 
More than likely, as meantioned B4 by Doitmyself, posible scale. Is it in a hard water area?
 

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