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Strange air noise and “whooshing” near pump in an otherwise efficient central heating system

Johntheo5 said:
Same as mine, so even if there was no vent and someone was daft enough to install and then close a isolating valve on the 22mm combined vent and cold feed, the PRV will lift and protect the boiler and more.
Click to expand...
you'd hope , if it wasn't a faulty PRV!
 

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