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Central Heating & Storage Heaters Forum
Loss of pressure in C/H system
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<blockquote data-quote="Geoff1946" data-source="post: 470053" data-attributes="member: 28452"><p>Leak sealer can be added to the system. Its like the radweld stuff used on car cooling systems, but first have a good look at all your radiator valves, connections and glands.</p><p></p><p>It takes very little leakage to drop the system pressure so you aren't necessarily going to see water, maybe just a build up of scale like lettuced around a leak source.</p><p></p><p>Also check the over pressure relief valve. If that passes at all it's probably unseen as it will drain outside.</p><p></p><p>First though, as someone else said, check your pressure vessel has been properly pressurised. If the system pressure rises quickly when the boiler is started from cold its a sure sign the pv needs re-pressurising.</p></blockquote><p></p>
[QUOTE="Geoff1946, post: 470053, member: 28452"] Leak sealer can be added to the system. Its like the radweld stuff used on car cooling systems, but first have a good look at all your radiator valves, connections and glands. It takes very little leakage to drop the system pressure so you aren't necessarily going to see water, maybe just a build up of scale like lettuced around a leak source. Also check the over pressure relief valve. If that passes at all it's probably unseen as it will drain outside. First though, as someone else said, check your pressure vessel has been properly pressurised. If the system pressure rises quickly when the boiler is started from cold its a sure sign the pv needs re-pressurising. [/QUOTE]
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Loss of pressure in C/H system
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