I have a 12 year old worcester 240 combi boiler and when I flush the bathroom tiolet there is a sometimes loud hummimg noise and vibrations from the boiler which is also located in the bathroom - any suggestions please.
try replacing the diaphragm in the ball cock unit as sometimes it splits causing vibrations through the pipes, it sounds far fetched but its about 50p for the part and takes two mins two fit
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.