leaking overflow pipe from combi boiler (two weeks constant)

[WATERHUNK]

I HAVE A POTTERTON PUMA 80 COMBI BOLIER, WHICH FOR THE LAST TWO WEEKS HAS BEEN LEAKING WATER FROM THE OVERFLOW PIPE, I HAVE TRIED BLEEDING THE RADIATORS WITH NO LUCK, IT IS ALSO MAKING TERRIBLE CREAKING AND CRUNCHING NOISES WHAT DO I APART FROM CALLING A PLUMBER!............................
NOVICE DIYer!!!!

 

[kevplumb]

1 turn caps lock off

2 try a search on expansion vessel

prv will probably need renewing

 

[HARALIAN]

Could be that the filling loop aint been closed off when the poltergeist has been topping up the system 2 weeks ago!