
In every running toilet, there is a fill valve. Fit means keeping the toilet working properly. If there is still running water, it’s time to call in the professionals.If you have a running toilet then you should always keep it fit. Flush the toilet a couple of times and look closely into the toilet bowl to make sure water isn't pouring down the sides, and there are no strange noises still. Hopefully your toilet won’t be leaking after completing all of our checks above. Work backwards to put the toilet back in place,’ says Steven Pester. Then unscrew the mounting nut (you may need pliers to do this) and pull out the flush valve,’ he advises. ‘Once you have the tank on a stable platform to work off of, remove the large foam gasket covering the plastic mounting nut on the tailpiece of the flush valve. ‘If they don’t come off due to corrosion then you might need to use a hacksaw,’ says Steven Pester. The toilet tank will be held in place by tank bolts which need to be unscrewed so that you can take off the tank. Next, drain the toilet by flushing and using a sponge to get rid of excess water. ‘Close the fixture shutoff valve located near the tailpiece on the toilet's fill valve,’ says Steven Pester of Resolve Plumbing Services at Rated People. ‘Or, if you don’t have a shutoff valve, just turn off the main water supply,’ he says. Firstly, make sure you turn off the water supply to the toilet. If the leaking still persists, the problem may be to do with the flush valve, which will need to be replaced. (Image credit: Avalon/Construction Photography / Alamy Stock Photo) Trim the tube off there and then clip it to the side of the overflow tube to keep it in the correct position,’ advises Matthew Jenkins. ‘To shorten this tube, pull it out of the overflow and hold it just above the overflow opening.

This can happen when the tube is too long and isn't positioned correctly in the overflow tube. Shorten the refill tubeĪnother cause of a running toilet is when the refill tube is always pumping water into the bowl. If you don’t, it may get caught underneath the flapper, which means that you won't get a good enough seal which will cause the toilet to continue running,’ says Matthew Jenkins. ‘Bear in mind, if the chain is too long on your new flapper, you may have to shorten it. Make sure you drain the water from the tank before replacing the flapper by turning the water supply to the toilet off and flushing the toilet to drain the water inside the cistern. ‘Then connect the new one to the chain and attach the sides to the pins.’ ‘You can remove the old one by detaching the chain and taking the flapper away from the pins on the side of the overflow tube,’ says Matthew Jenkins. ‘If it does stop, that indicates that the flapper is failing to seal properly, and requires replacing,’ he adds. To find out if the flapper needs replacing, use a stick to press down on it when you hear running water, and listen out for it to stop,’ says John Lawless. The flapper is the rubber stopper at the bottom of your toilet tank which prevents water from the tank from flowing down into the bowl below.

When the flapper on your toilet is old, it may stop sealing as it should, and this can result in water constantly passing from the tank into the toilet bowl.

(Image credit: Future PLC/David Merewether) If you need to lower the water in your toilet with a column float attached to it, loosen the clip or screw, push the float down, and then tighten everything back up,’ adds Matthew Jenkins. ‘To lower the amount of water in the toilet with the float arm, you’ll need to loosen or tighten the screw until the float arm lowers. ‘You can adjust the water level by changing the height of the float.’

‘This tends to happen when too much water is present in the tank,’ says Matthew Jenkins. One of the most common causes of a running toilet is when overflow water is leaking down into the bowl from the tank through the overflow tube. Once you have a clear view into the cistern, flush the toilet and look to see what is happening to the water and the mechanisms inside the cistern. This might be behind the flush plate, or you might have to remove some tiles or panels that are covering it. If your toilet has a concealed cistern, such as a back-to-the-wall or wall-hung design, you need to find the access point for maintenance. If you have a standard toilet with a visible cistern, simply lift the lid. To work out what to do about your toilet running constantly, you need to find out what is causing the issue by opening the cistern. (Image credit: john shepherd / Alamy Stock Photo)
