Please can you tell me how to get rid of the knocking noise when turning on the hot water tap of our British Gas C1 combi boiler. we have bled the radiators and they are fine.
If memory serves me correctly, it is 24 cdi. No known problems (at least to me) that would cause this.
Suspect waterhammer or loose washer.
Do you get the noise with ALL hotwater taps, or only one?
You'll probably find you have a faulty dhw expansion vessel on the pipework somewhere....if you havn't got a water meter or other non return valve you don't need one.
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.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local