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as tw said check your FnE tank in the loft for water, check your system for air. Its possible the noise was from a pump that's has become dry. If the FnE has water inside it check the radiators and all working air venting points on the system if there is no water or air blown out then you...

I would also go with the diverter valve on the appliance as a possible source of the problem them boilers are prone to blocking up on the microbore tubing. If the valve don't make the micro switches then i would go diverter valve / tubing but also check for other components (I would advise...