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Boiler pressure loss after service

What's a HEX?
The Primary Heat exchanger

Thought a PRV only leaks through the copper overflow?

:confused: .... Yup, it does, the OP has mentioned 2 areas where the system is dripping from, one from the condensate and one from the PRV outlet, put a bag over that outlet will show that the PRV is passing and how much water it is letting by, it could be down to a bad EV. The condensate is another issue and could indicate a pinholed HEX if it keeps dripping all the time.
 

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