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.
It will probably one of two things.
1. A leaking (or partially open) tap on your filling loop. These must be
kept disconnected, but almost never are. If disconnecting it shows the tap
to be leaking slowly, it must be replaced. (It might just not be turned
2. A leak in your heat exchanger. This allows mains water from the DHW side
to cross into the primary circulation water in the combi DHW heat exchanger
(or DHW cylinder as appropriate). This is more serious and expensive, but
MUST be fixed immediately.
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