Potterton 30he combi pressure drop

Joined
8 Dec 2008
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Location
Kent
Country
United Kingdom
I had my combi boiler installed in November. Unfortunately i have to bring the pressure back up every two weeks. All the pipework has no obvious leaks. I have let the system stay cold to check as it is harder to tell when hot.

The radiator in my bathroom fills with air which i believe is the first on the run.

Am i right in thinking that with the pressure drop and air in system that there must be a leak somewhere or could there be some other problem (expansion vessel?). My next step is to try some leak sealer to see if this helps.

Open to suggestions on how to cure.
 
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