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Mend Worcester Bosch 24i Boiler Pressure Switch

worchester combi boiler 24i won't hold pressure?

the boiler keeps lossing pressure. everytime i switch it on i need to open up the black tap to fill it up with water. as a result the radiators are only warming up half way. i've tried bleeding them all but nothing is working any ideas.

mike
November 2007
Worcester BoschWorcester Bosch 24iHeating, Home Heating SystemsBoiler Pressure Switch
I have a worcester CDI 30i with the same problem so I would be very interested if anyone has any ideas. I cannot find any leaks in radiator system but I have not ruled this out completely as I have not checked all the radiator joints under the floor boards.
Please any help

DOM
November 2008

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Worcester Bosch 24i Losing Pressure - Fixes