Repair a cistern


Every day we use toilets without paying attention to them. The use is so obvious that we often do not realize how intensively the toilet is actually claimed at home. Only when really a defect is present, one deals with the toilet. In most cases, any home improvement can repair a toilet. All that is needed is some knowledge of the existing technology. Mostly the defect is to be found in the toilet cistern. That's why we have prepared a manual for you to repair the cistern.

The different systems in toilets

Especially the cistern is not noticeable to many people. Either you do not see it anyway and just a big pusher plate, or you push the water button so naturally that we do not consciously perceive the cistern. But if the toilet once has a defect, it is usually due to a problem in or on the cistern. First, you should know the different cistern systems:

  • Floor toilets with attached cistern
  • Domestic toilets with highly installed cistern (usually below the ceiling)
  • hanging or wall mounted toilets with attached toilet cistern
  • hanging or wall-mounted toilets with wall mounting (toilet cistern in the wall of the stanchion)

Open a cistern

Basically, all systems work on the same principle. Only the operation and position of the cisterns differ. For a cistern in the stem element, you must remove the pusher plate. This is usually just plugged in, so it can be carefully removed with a thin screwdriver.

High-hanging cisterns are usually found only in old buildings. Many of them have no lid, everything is open. But you need a ladder for this. The attached cistern may be a model of plastic or ceramic (porcelain). Ceramic cistern lid are usually only placed, which are made of plastic. With a little jerk, they can be taken off quickly.

What is there to repair at the toilet cistern?

The damage that can be present in or on the cistern is versatile:

  • calcified or silted moving parts (valve does not close properly)
  • porous, hard or calcified and muddy seals
  • broken float
  • bent plastic arm that actuates the inlet valve
  • Deposits or other defect in inlet valve, flexible hose or angle valve

The following instructions apply to all damage to and in the toilet cistern.

Step by step instructions for repairing the cistern

  • possibly new seals (below the float, at the inlet valve)
  • possibly new swimmer
  • possibly new actuating arm (from the float to the inlet valve)
  • possibly new inlet valve
  • possibly new flexible hose or inlet valve and sealing hemp
  • Wasserpumpenzange
  • if necessary, wrench or ratchet box

1. Preparatory work

First you have to remove the lid as described or position a ladder. Then turn off the water at the angle valve. If you can not find this (or is there none), you will have to turn off the main water tap.

2. Disassemble the mechanism from the cistern

First, the operating arm is unhooked, then you can pull up the float (the water in the cistern now runs off). You will see the rubber seal at the bottom of the cistern to check. The second rubber seal, which may have a defect, sits on the inlet valve, which you can also remove.

All removed parts can now be placed in a container with water and a lime-dissolving agent (from the store, vinegar essence, citric acid, etc.). You have to let the solution work for several hours. Then you can clean all parts with a very fine and soft wire brush. The moving mechanics at the inlet valve can now move them back and forth many times to make them workable again. If necessary, you can also spray some rust remover.

Then reinstall the valve, position the float and hang it on the arm. Turn on the water now. If it still runs over, do not empty the cistern yet, but turn off the water again. If it is still running, although full, the rubber seal under the float is broken or the hollow float (which also serves as an overflow) is broken. If the water then runs over again, the inlet valve will no longer close at the required position. So this must then be renewed.

3. Water flows in very slowly

If the water flows into the cistern very slowly, the inlet valve, flexible hose or angle valve may be leaking. In the worst case, you have to change everything in sequence, whereby you can also check the angle valve and the hose without inlet valve or flexible hose, so you can turn the water on.

Tips & Tricks

Not only that, the toilet cistern may be broken and may require repair. It is also almost more common that the toilet is blocked. Of course, we also offer help on what to do if the toilet is clogged.


Video Board: Fix Constantly Running Dual Flush Toilet Cistern By Replacing The Flush Valve Washer