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loss of pressure in Worcester240 rsf?

My worcester240rsf loses pressure as soon as it is switched off. No obvious leaks and pressure relief valve works ok.Everything works fine when repressurised. Any thoughts?
John, March 2008
iain.
Affirmtive. No water dripping

John, March 2008
quote: and pressure relief valve works ok??????????
do you mean no water coming from there?

iain, March 2008