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just had a call from a customer wh s a worcester 9.24evidently for some time he has only been able to get hot water when the heatings on ok that sounds like diphram or threeway valve then he said but now its going to lock out when he runs a tap any suggestions ? im hopn to get a boiler change out of it but just want pointers to possibe causes chances are ill get there and the fan will be one