Valliant boiler grinding noise

[HannibalFunk]

So a couple of weeks ago we noticed the boiler making this noise (see vid), its much louder than we've known it to be, and there seems to be condensation or steam coming out of the hole in the top.

Strange thing is that it only makes this noise if we run the bath, the sink taps or heating do not trigger the sound and the boiler sounds normal when it fires.

Any advice appreciated.

 

[Harry Bloomfield]

and there seems to be condensation or steam coming out of the hole in the top.

The hole in the top, is releasing deadly combustion gases into the room. It is intended for flue gas analysing, and should normally be capped.

You need to turn that boiler off, and call a Gas Safe engineer to sort it out properly.

 

[HannibalFunk]

Yeah I've got vaillant coming this afternoon