Worcester Bosch Persistent Pressure Loss

4 Jan 2015
Reaction score
United Kingdom
Hi everyone,

I am looking for some help.

I have a Worcester Bosch 30CDI combi boiler which has persistent pressure loss. I have checked all pipework for leaks and found none. I have replaced any joints which looked like possible leaks and applied fernox leak sealer to the system. But, I have still got the continued pressure loss.

I have pressurised the system cold to 1 bar, the pressure rises to about 2.5 bar when operating. It then falls back and loses around half a bar a day. I have put a polythene bag around the pressure release valve pipe and there is no water leaking there.

Could there be a problem with the heat exchanger leaking?

Thanks in advance for your help,

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

Sponsored Links