Do you have a dual flush toilet that never stops? The most common cause is a flush valve seal worn out, deformed, or unclean. Water may leak continuously if the flush valve seal is not adequately sealed. Another possibility is that the tank is constantly filled due to a broken fill valve.

Is there a problem with the fill valve in your toilet? It will keep filling the tank with water. Water will spill into the toilet bowl due to the overflow tube. It can be one of the reasons why your toilet cistern keeps running continuously. 

A toilet fill valve is a toilet tank component typically positioned on the tank's left side. It serves to fill the toilet tank after each flush and is attached from underneath the toilet tank to the water supply line.

A float cup or cylinder is attached to the vertical fill valve body in dual flush toilets. The float regulates the water level in the toilet tank and the opening and closing of the fill valve.

The fill valve opens and starts filling the tank, which had been closed up until that moment when the float falls to the bottom of the tank during a flush. The float gradually rises to the predetermined height as the tank fills with water, at which point it stops, and the fill valve closes. The overflow tube should be about half an inch below the water level in the toilet tank.

The fill valve will continuously fill the tank with water. The extra water drains to the bowl through the overflow tube. In addition, a faulty fill valve may fail to close even when the tank is complete, and the float is in the up position. It will need to be changed because the tank will constantly be filled with water. It will float if the level is set higher than it is advised.

Diagnosing a constantly running dual flush toilet

Before trying to remedy a constantly running toilet, you must check to determine whether the fill valve or toilet seal has the issue. Then, lift the toilet tank cover and store it away securely so it won't fall and break.

Make sure the water level in the tank is above the overflow tube. If the tank is filled enough for water to flow through the overflow tube, your fill valve or toilet float may malfunction.

A fill valve that is broken or leaking needs to be replaced, while a toilet's float height can be readily changed. Therefore, the toilet float is sold along with new toilet fill valves. The toilet seat, however, will likely be the issue if the fill valve or float does not appear to cause the problem.

How to fix a dual flush toilet that is continually running 

When a dual flush toilet doesn't stop running, the seal is usually the cause of the issue. You probably need a remedy to remove the constantly running toilet! You just need some Ideal Standard toilet cistern spares to fix the dusty, misaligned, or damaged dual flush valve seal. You need to replace it if it has worn out or has become more challenging over time. Adding our Ideal Standard toilet cistern spares could be the best option to make your dual flush toilet function like new.