my hot water taps works after two minutes it again stops ?

I have a Vokera 02291 model combi boiler the hot water taps give hot water two minutes after opening it then again it stops after two minutes any solution?
I have tried bleeding the radiators and maintaining the pressure between 1and 1.5 still can't seem to get it to work can you tell me what it could be due to?
Thanks
emma, February 2010


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