worcester 28i junior combi boiler?

my worcester 28i jnr trips out after about 3hrs on the heating. you can reset then it works again for ashort period of time then trips out again any ideas.

ski
December 2008

you need to blow the pressure off on the boiler, and generally done by opening pressure release valve.
p.r.v held open inflate expansion vessel to 1 bar. close prv and top up to 1.5 bar.

notes: prv will probably leak afterwards but sometimes a couple of quick snap shut moves on it before you top up will make sure it seats a bit.

try pressing pin in in vessel valve to see condition of vessel.

nothing out valve-may just need re-charged
water out valve-diaphragm prop shot, new vessel

iain
October 2008