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@mariz No I wasn't able to get to the bottom of the issue. However I have not done anything but have noticed the noise has reduced. I'm planning on leaving it as it is until it breaks down as this problem is unknown by the engineer. It could be just trail and error and could have a long bill...

I can confirm when I remove the air duct (black pipe) the noise is reduced considerably. As soon as I fix the air duct, after about 10-15seconds later the noise starts. With the air duct on, I placed my fingers at the end of the duct to partially disturb the air flow and the noise gets worse. I...

@Wongfeifox I know the service engineer did take out the air duct and ensured that it was clean. I can't recall any gas work taking place near the property recently. Could it be that any debris is caught in the boiler after the leak, which meant the debris has go into the main boiler. I do have...

Guys what could be wrong? Can you hint me so I can specifically ask the engineer if he doesn't look into it.

What does OP mean?

Thanks guys for your response. I will set the gas valve to fully open position and will get a fixed price quote from Vaillant. @ScottishGasMan The water that came out from the radiator was brownish and has left a stain on my carpet (getting rid of the stain by using Rug Doctor spray). See...

I am in need for some help on my Vaillant 837 EcoTec Plus combi boiler (installed in Dec 2009) that is making noise. Same noise as in this video. While I was decorating the house I had taken off the radiators from wall and left the thermostatic valves on closed position. After many weeks (6...