In message , willsniffer
writes
have a combi which gains pressure from 1 bar to 2-3 bar overnight and have
to release pressure. Suggestions so far include removing flexible loop ( is
this easy??) or leaking diverter valve (?). Any thoughts - it's a vokera.

My first idea would be that there is a small flow of mains water into
the system gradually increasing pressure.

Techinically the filling loop is supposed to be disconnected anyway -
that's why you have one.

It's easy enough to remove, just undo one end of it. If it's is leaking
a bit of mains water into the system when shut then it will probably
still be leaking a bit when is connected to arrange something to collect
the water. If that is the problem you would need to replace the valve at
the mains end.
--
Chris French, Leeds