cistern makes a noise like a horn when flushed.maker armitage shanks cistern has no overflow pipe if ball valve fails it overflows in to toilet bowl

iain, March 2009

You will have to take a look at the inlet of the cistern.
Off the main to the cistern and dismantle the inlet.
Have a look at the rubber washer and if necessary change.
There may be some particles/lime accumulated in the mechanism. Clean and fix it back. It should clear the problem.

ma, March 2009