White crust on fittings

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Tyne and Wear
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United Kingdom
Discovered white crust around compression joints and isolating valves around central heating pump.. Does it need attention? No leaks found.
 
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Clean it off, make sure the compression nuts are secure, and keep an eye on them. You may have a weep. If you do tighten nuts, only nip them a bit, don't over-tighten.
 

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