Glow Worm Boiler Problem

[Paul S]

Hi

I have a Glow Worm Combi Boiler, model 23C. Since last night I have had water leaking from underneath the boiler. On closer inspection, and using the diagrams in the manual, I have discovered that the water is coming out of the Reduced Pressure Zone (RPZ) valve. Can somebody explain to me the purpose of this valve? Also, does this fault indicate a problem with the valve itself or another problem elsewhere in the boiler?

If I open the filling tap of the boiler and refill the system this leak stops. The boiler and therefore the central heating and/or the hot water will work fine. However, after a while (I think it may be once the system starts cooling down again), the water starts dripping out of the bottom again.

Thanks Paul

[Ed Sirett]

The term is not one that is typically used to describe any familiar boiler component.

I'd hazard a guess that it just might be the pressure releif valve, but with the manual and seeing what it connected to I'm only guessing.

[Paul S]

Don't know if helps but the manual for the boiler can be found here.

diagram I was referring to is on page 39 (diagram 18.13)

Assuming it is a pressure relief valve, is it possible to diagnose what the fault may be?

Thanks for any help

Paul