How can I stop my Worcester 24i from building up too much pressure ?
My Worcester 24i combi boiler has just started to build up pressure beyond the blow off valve setting (IE. in excess of 3 bars). I thought the filling loop may be passing, so I disconnected it but the same thing happened. I drained the system in case there was an air lock somewhere but still the boiler is building up too much pressure. Even when the boiler is turned off the pressure does not go down, I have to manually let out some of the water in the system. I am at a loss now.
Steve Ashford, December 2016