The majority of toilet flush problems originate in the cistern. The purpose of the cistern is to store the water used when the toilet is flushed and to house the valves required to empty and re fill the. The cistern usually contains two major parts, the filling/inlet valve and the flush valve/siphon.
A running toilet can be a constant source of irritation, not to mention a waste of water. If your toilet cistern sounds like it’s constantly filling it may be time to replace the inlet or flush valve, if not both.
Repairs of this nature are usually straight forward and should take between 1 – 2 hours, depending on the style of toilet.