baxi combi instant 105e - noise problem

29 Mar 2008
Reaction score
United Kingdom
After the hot water tap is turned off there is a noise from the boiler that lasts anything from a few seconds to several minutes. This only happens when the CH is also on. The noise sounds like it is a valve trying to open/close. The DHW and CH pressure differential valve diaphragms have both been checked and they are fine. Everything works as it should except this noise.
Sponsored Links
can you check the expantion vessel ,it sound like it's full of wather rather than air--does the presure guedge move up as the boiler starts up?
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local