CH pressure relief valve

[ss]

When I set the pressure valve on my combi boiler to around 1 to 1.5 bar I get some dripping at the outside pressure relief valve, the pressure will drop to around .25 to .5 over a couple of days and then remain there for long enough, at least a couple of months before I decide it is too low and pressure it back up to around 1.5 bar....and cycle repeats.

Is this an issue or just a faulty pressure gauge (Baxi combi boiler) It has been this way for a couple of years now but I did have a drippy connection at a radiator at one point (now sorted) which I assumed was causing the pressure drop, but not so.

[newshound]

Once they have lifted, pressure relief valves sometimes never seat properly again, either because of limescale deposits on the valve or because of erosion on the seat. The *only* answer is to change the valve. A generic one from BES, etc. will fit, just make sure you have the right gender of inlet and outlet ports.

[harry]

Take your pressure relief valve to bits and check the valve seat etc. It may be fixable by cleaning accumulated crap off.

[ss]

As everything appears to work ok apart from a wrong reading (assumed) on the pressure gauge I think best I leave well alone until the better weather as knowing my luck I will end up with no heating.