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HOW CAN I FIX THE FOLLOWING PROBLEM?

My Boiler is a Valiant turbo max plus which will not hold pressure and has to be re-pressurised on a daily basis. There are not any water leaks in the pipework or radiators,therefore, i assume the fault is within the boiler itself. Can anyone advise me on what the possible cause can be.
DAVID SMITH, April 2006
check pressure release valve

paul, April 2006