my boilers leaking through a pipe going outside, how do i fix it?

there are acouple of reasons why the overflow is leaking.
Is the filling loop turned on? To be sure that this is not the cxause of the leak disconnect it(take care if it is the cause of the problem water will leak inside .
the other possible cause is adamaged plate heat exchanger causing the boiler to overpressurise, if this is the cause of the problem it will need to be replaced.
Sime can be contacted on enquiries@sime.ltd.uk

terry brow
August 2007

It could also be a faulty pressure vessel

bigclive
April 2007

you just copied the last answer

pam
March 2007

you have to replace the safety valve - the spring has probably weakened allowing the valve to open at lower pressure.

TT
March 2007

prv leaking follow the pipe under boiler there is a red knob open and shut it a few times. they get dirt in them if it don't work fit new prv (pressure relief valve).

hi-spec plumbing
March 2007