I have a Saunier Duval combi boiler model SD623 and the pressure has gone right down to zero, so that there is hardly any hot water available. Is there a simple way of increasing the pressure myself, and if so, how do I do it?
there are two screws/bolts underneath the boiler turn these to your required pressure, best to get some to show you first.
My question is do you do this when the boiler is on or cold.
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