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Mend Baxi combi instant 105e Combi Boiler Heating System Pressure

my baxi pressure bar goes upto 3 when i switch on the radiatoes?

normally my pressure bar is under the 1 and when i swithch the radiators on it works its way upto 3 into the red. otherwise it gives me hot water when i whant and the radiators work ok. how can i fix only the pressure bar.
my baxi is the model combi instant 105e

fil
November 2007
I have the same problem. How do you re-pressurise the expansion vessel?

Les
November 2007
it may be the expansion vessel

barry
November 2007
The expansion vessel most probably needs repressuring. This is the usual cause of over pressuring.

Mr A
November 2007

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