Worcester Bosch greenstar 30 cdi pressure problem

[Grover2000]

Hi everyone,


I’m hoping someone with experience of Worcester Bosch boilers can offer some advice.


I have a Worcester Bosch Greenstar 30CDi, and the boiler pressure keeps gradually creeping up during normal use.


The filling loop valve is fully closed, and the filling key has been removed, so I don’t believe water is entering through the filling loop.


The problem is that the pressure continues to rise throughout the day, and by the evening I have to bleed water from a radiator to bring the pressure back down.


Has anyone experienced a similar issue or know what might be causing this?


Could it be a faulty filling loop valve, a passing plate heat exchanger, or something else?


Any advice on what to investigate or ask an engineer to check would be greatly appreciated.


Thanks in advance.

 

[CountryFan]

Is this with or without heating in use? If the latter then likley a passing plate, isolate the cold inlet and see if problem persists, if the former then blocked vessel and or communication pipe.