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Posted by Louise on February 12, 2002 at 04:17:51:
We have got a Vaillant combi boiler that has been fitted since last August. The problem is whenever we turn the hot water on there is a really loud bang in two of the radiators upstairs (in the rooms either side of the boiler room). When the heating is off it never ever makes this noise, only when the heating is on. The hot water works fine but the noise is horrible, it sounds like someone is kicking the radiators. We had the diverter valve changed by vaillant last November as the hot water just stopped working but the banging was there before and after this part was replaced. Any ideas? Thanks.