In my long loft I have two shower pumps and two hot water cylinders. The pump/tank on the far end of the loft is for 1 bathroom and the pump/tank on the near end is for another bathroom.
After running the shower at the far end of the house, when I turn the shower off, the shower pump at the near end of the loft starts for 1 second, stops for 1 second and then repeats. It goes on for about 3 or 4 minutes. Obviously, with all this starting and stopping, it reverberates through the house quite loudly (it sounds like it's trying to escape!)
Why would this happen?
p.s. not enough rep to create tags 'shower-pump' and 'hot-water-cylinder'