Glow-worm Space Saver 50-60F?
When the boiler fires up, there a buzzing/vibrating sound. It seems to be coming from the metal box on the bottom left hand side of the unit (it has the heating dial on the front). This only happens whilst it heats up the storage tank - the system seems to be working fine otherwise. Could this be the thermostat? Any assistance would be appreciated.
Stuart Evans, September 2010
