On Tue, 3 Feb 2004 00:30:18 +0000, Richard Markham
Is this a new phenomenon, or has it always done it?
If it's recent, and was OK in the past then it's likely that the
pressure vessel has lost pressure and needs to have some air added via
(e.g.) a footpump, or it is possible that the diaphragm inside has
sprung a leak, in which case that means a new pressure vessel.
If it has happened from new, then it could be that the expansion
capacity in the system is inadequately sized and a larger or an
additional vessel is needed. Often in these cases, the pressure
relief valve lifts and water is ejected. Then on cooling the pressure
drops below what it was before - a vicious circle because you keep
topping up to no avail.
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