my combi keeps loosing pressure in central heating system..checked all rad for leaks and seams to be dumping water out of the overflow when on!!! if top up presssure it runs fine.

Richard a, October 2011

hi its running at 3 and it is dripping out of overflow! is it an easy fix or big job to get to!!££££

richard a, October 2011

System cold pressure should be about 1, If it dumps water out of overpressure valve when running, valve faulty, what pressure does it read when it starts to dump, usually about 3.5 for normal, but system should not get to that, if it does, maybe expansion vessle is full of water, so no expansion room

SD, October 2011