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my boiler wont work it sounds like a kettle?

i have a valliant boiler the pressure dropped so filled it back up it was working fine then the pressure dropped again i have filled it up again bled all the radiators and its not working it fires the pilot light, sounds like a kettle taking of then goes offthe numbers on the panel rise rapidly as if its reaching the temperature then goes off it does throw in a a fault sometimes f20 and the pump gets very hot can someone help please.
karen newport, February 2010
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