Probably one of the most usual flushing arrangement is by using something called a direct action cistern fitted to the toilet. The water is supplied into the cistern via an inlet valve. The inlet valve is worked by a hollow plastic float connected to the end of an long arm, which will open up the valve to fill as the water level lowers and close as the water reaches a pre set level inside the cistern change (this prevents overflows). This water level is set by the requirement of the volume required to flush away the waste in the pan. This will innevitably fail at one time or another. If this occurs, it is recommended that you visually check first for anything that is really obvious. A Radlett Plumber can fix a broken flush. If it looks fine it is more than likely due to a failure of something a little closer to the water outlet. A common failure is something called called a diaphragm washer. The more modern float-valve system has a diaphragm valve, that is fitted to take the place of the old style washer. This has a large diaphragm and is less likely to wear and become a victim of limescale. This type of new valve seems durable and requires less maintenance.
To swap this diaphragm, isolate the water supply and drain by operating the flush the toilet. Radlett Plumbers are professional tradesmen. Undo the nut that connects the float arm on the top of the valve and put it away in a sefe place. Unscrew the ball-valve unit, and take out remove the plastic piston. Take out the old worn diaphragm, make sure everything is clean before you fit the new diaphragm. Lubricate the part with silicone grease to protect and ensure good operation. Put the assembly back together and reinstate the water, checking for correct operation and that there is no leaking.


Isolate the water feed to the cistern and remove the water by bailing out with a small bowl and some old cloths. Lift the siphon arrangement from the body of the cistern (take photos if you are unsure). You will need to disconnect the linkage to the lever arm, if the arm of the float operated valve is in the way, you will need to remove this also. BR2 Plumbers can replace defective seals and washers. Once the siphon is out, you should now be able to see underneath the base and the place where the old perished diaphragm washer usually sits.
Disconnect the hook on the shaft that lifts the diaphragm, this will let the diaphragm housing drop from the siphon base. Fit the new washer, and re-fit all the parts in the reverse order of removal. Turn the cold-water feed back on, make sure the cistern starts to fill and visually check for leaks. All jointing washers need to be in a good condition, if not, wrap some PTFE tape around the joining parts.