My boiler was installed 12 months ago. All was fine but now whenever it fires up a knocking noise is heard. I have had an engineer out and the boiler checks out fine. He suggested it was air in the pipes. I used the finger vent in airing cupboard to bleed but noise still happens. Can any suggest a fix?
WB 19/24CBi
- Thread starter santodel
- Start date
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by the diverter value, I presume you mean the Y plan. This was also replaced with the valve. I can't find any vibration in the area of the cylinder. It always appears to be in the pipes. When the boiler fires up, the noise starts about 60 seconds or so after the initial fire up and continues until the boilers stops. When the fan is running in the boiler, it doesn't happen. The knocking isn't constant, regular, every 15 seconds or so I get a knock or a series of several. It sounds like a kettle between knocks when the kettle could use a descaling.
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