Loss of pressure - where's the leak??

[Gilly10]

Hi - guessing people have hit this before - have done a quick search and can't find a recommendation....

My boiler, Worcester 28CDi, is suffering from a loss of pressure, and has been for the last year (since I bought the house) - perhaps 0.2 bar every week... There are no obvious leaks around the house or the boiler which I'd expect to be evident by now, I obviously don't want to rip up the floorboards - but am a little worried....

Any suggestions?

 

[John_D]

Hi are you getting gas in the radiators which needs to be released?
If you are then it is corrosion which is reducing the pressure."iron radiators + water = iron oxide + hydrogen" the hydrogen being gaseous can be squeezed to reduce the water pressure. If this all applies you need to add system conditioner Fernox or Sentinel X100

another thought is that small leaks on radiators evaporate before they're noticed, except when the system is cold.

 

[gas4you]

Any drips out of the prv pipe?

 

[J Bean]

AAV maybe?... iv found them to leaks on 24/28i....