My question is regarding two issues one of which is already a history but may help define the problem. Couple of days ago I noticed a leak outside of the house from the pipe which I think is called drain or safety pipe. Yesterday I noticed that pressure was around 3.5 bars, and i know it should be around 1. So i looked for some advice on the net and followed it - I drained some water from the radiator and the pressure droppped. Unfortunately a while later it started rising again. So I used another tip and turned pressure release valve - it helped. After raising pressure from 0 back to where it should be (using the valve on the loop, dont know how to call it) the pressure dropped again and my wife noticed that the leak outside became serious. Is it the PRV which causing the problem or something else?
Please help.
Andy

andy, February 2010

Hello, again.
Well, I checked everything I could and the final outcome is that: case 1 - the pressure rises to about 3 or more bar and the leakage is almost unnoticeable, case 2 - the leakage is quite serious and the pressure is stable around 1.5bar. Currently the case 1 is on. What I notice as well is that the pressure drops to 0 and leakage is gone when I close the main water feed to the boiler, and funny thing happens when I open hot water tap - the pressure rises by around quarter of a bar and drops back with a squeaking sound when I close hte tap. Important thing is that filling valve is 100% sealed. I'm about to remove the prv and possibly change it, but need to be sure if its really prv.
Thank you everybody for sparing some time
Andy

Andy, March 2010

I checked the filling valve and its not letting the water in. Seems like its something bigger requiring a serious job. My question is can i do it myself? Dont enen know if its the prv or ex vessel causing the problem.

andy, March 2010

Hello, again, i have an update. The pressure is quite stable now jumps from 1 to 2 and back again but not very often but the leak outside is still present.

andy, February 2010

does the rapid rise in pressure only occur when the CH on ?
let some water out the system now with no water pressure reading on the gauge check the expansion vessel AIR PRESSURE, a tyre pressure gauge and foot pump will be needed ,momentarily depress center of the car valve only air should escape if WATER diaphram split/perished connect car pump to the valve (will have to use hands to work pump)inflate to 1 bar pressure (14.5lbs) approx check valve for leaks (spit test) if leak release pressure replace the inner valve core when happy no leaks refill the pressure on the water side to 1.5 bar cold

wirecutterman, February 2010