I have a vented Vitodens 100. the flapper valve was replaced a few months ago under warranty. It is about 3 years old. The system was very clean before installation but was powerflushed anyway. The house has a water softener and the system was filled using 2% Sentinel X100, so there should not be limescale or sludge in it.
A few weeks ago I heard a brief tinkling sound which lasted some seconds and then went away. It seemed to me that it was like a bit of grit rattling around the heat exchanger coil and then being blown out in the flow. It did not return.
In the last week or so the boiler has been making what sounds like a kettling noise. It comes on when the flame is high and disappears when the flame is low. It does not vary with flow temperature.
I have attached a video with the noise, showing how it varies in volume with flame speed. I don't think it's the fan speed, though I suppose it might be.
Is it really kettling, or what? The system does not have a filter on it, the idiot installer took my Spirovent off it because he thought it was interfering with flow.
http://youtu.be/eJKnT89rXPk
A few weeks ago I heard a brief tinkling sound which lasted some seconds and then went away. It seemed to me that it was like a bit of grit rattling around the heat exchanger coil and then being blown out in the flow. It did not return.
In the last week or so the boiler has been making what sounds like a kettling noise. It comes on when the flame is high and disappears when the flame is low. It does not vary with flow temperature.
I have attached a video with the noise, showing how it varies in volume with flame speed. I don't think it's the fan speed, though I suppose it might be.
Is it really kettling, or what? The system does not have a filter on it, the idiot installer took my Spirovent off it because he thought it was interfering with flow.
http://youtu.be/eJKnT89rXPk