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boiler pressure goes dopwn to 0 also water coming out of small tube on side?

water leaking from side of boiler by small tube also the pressure goes down to 0 fill up with loop 10 15 30 mins later goes down to o again wats thje remedy please any one
sam, March 2009
your press relief valve is passing, it is a safety valve that opens if the press' in the boiler goes above 3. some john wayne engineers open it to empty the boiler of water, which can cause debri/sludge in your system to to stop it shutting fully again. so once your system is filled back up it drips like a faulty tap washer and the press in the boiler goes down again. might have to get local john wayne back to fit new PRV

PAPMCG, March 2009
(p.r.v.)pressure relief valve is letting by you need a new valve

stew, March 2009