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Boiler capped for faulty expansion vessel, prv and filling loop??
Sorry was a quick one there, I done some cp12s at a block 7 in total. All passed. Now another engineer has gone there 2 months later and capped the boiler for this. I now know the prv was opening slightly and leaking outside and the filling loop was stuck open... How this was re-pressurising the system I don't know as I always disconnect the loop and cap!!
Never seen a prv fail to open.
Seen plenty not reseal afterwards.
More clarification needed.
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