Pressure dropping on boiler.

[96mgb]

Hey

I have a worchester 35cdi 2 boiler. It recently got high pressure when I over filled it however I opened a radiator and drained it back to the correct level. (About 1bar). However now I keep finding that the overflow is letting water out and the pressure drops below 1 bar. It's a slow process but the pipe is wet.

Any ideas how to stop it?

 

[Newboy]

Sounds like the pressure relief valve is not seating properly - get a GasSafe engineer to check it and, if necessary, replace the valve

 

[ALCPlumbing]

Does it drip constantly or only when you have the heating on? If the latter I would expect the problem to lie with a flat expansion vessel.