Common Heating & Plumbing Issues – Running Toilet

Posted by: Carshalton Boilers on 28th February 2019

Another common plumbing issue that occurs is a toilet that won’t stop running. There is nothing more annoying especially if it’s in an ensuite!  This season we are looking at some of the most common plumbing issues that we come across, below we give you a few tips on what to do to fix the problem.

The Cause

It’s all to do with the water level in the toilet tank, that is controlled by an adjustable float. If the float is too low it won’t flush, if the float is too high, water overflows into the tube and the fill valve can’t close.  This makes the toilet constantly run.

What you need to do

Firstly, remove the toilet cistern lid.  You need to find the fill tube, which runs out of the open, overflow tube and into the fill valve.  The fill tube is the flexible tube.  Check that this tube is connected to the fill valve and overflow tube.  It needs to sit an inch below the overflow tubes rim.  This may fix the issue.

To alter the water level

If the toilet is still running, next you need to check the water fill height.  If the float in the water cistern is too high, the water will just run.  To alter the float, you need to turn the screw on top of the fill valve so you can alter the height if the float.  We recommend you set the float to about an inch below the overflow tube.  This should stop the toilet continually running.  If the float continues to be a problem, you could try replacing the float.

Handle and flapper

If the water height looks right and the float is set correctly, but the issue continues, next you need to check the handle and flapper.  If the chain that connects the handle to the flapper is too short, the flapper can’t close, therefore the water will keep running.  Ensure that the chain has enough slack to allow the flapper to close without the the handle hitting the toilet lid when flushing.

How Can We Help?

Still having issues? At Carshalton Boilers, we specialise in all your plumbing needs.  We are a friendly, family run business, covering South London, Surrey and surrounding areas.  Call us today on 020 8395 8060.

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