{"id":4812,"date":"2026-05-26T09:39:19","date_gmt":"2026-05-26T09:39:19","guid":{"rendered":"https:\/\/www.showerstoyou.co.uk\/latest\/?p=4812"},"modified":"2026-05-26T09:39:19","modified_gmt":"2026-05-26T09:39:19","slug":"how-to-fix-a-running-toilet-cistern","status":"publish","type":"post","link":"https:\/\/www.showerstoyou.co.uk\/latest\/2026\/05\/how-to-fix-a-running-toilet-cistern\/","title":{"rendered":"How to Fix a Running Toilet Cistern"},"content":{"rendered":"<p><span data-preserver-spaces=\"true\">If your toilet won\u2019t stop running after flushing, you could be wasting hundreds of litres of<\/span><span data-preserver-spaces=\"true\"> water every day. The good news is that most running toilet problems are caused by a faulty valve and can be fixed in under 30 minutes.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">A running toilet cistern can significantly increase water usage. It wastes water and significantly increases your utility bills. A <\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/sanitaryware\/toilets\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">toilet<\/span><\/a><span data-preserver-spaces=\"true\"> constantly running can be annoying. Thankfully, you can fix a running toilet yourself. <\/span><span data-preserver-spaces=\"true\">This<\/span><span data-preserver-spaces=\"true\"> is a straightforward DIY repair. You do not need to be a plumbing expert. <\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">Showers to You<\/span><\/a><span data-preserver-spaces=\"true\"> will show you how to stop the toilet running today.<\/span><\/p>\n<h2><strong>Why Your Toilet Cistern Keeps Running<\/strong><\/h2>\n<p><span data-preserver-spaces=\"true\">Understanding your plumbing helps you fix a running toilet cistern. The cistern holds water until you press the flush button. Water then flows into the bowl to clear waste. A fill valve allows water to refill the tank. A flush valve seals the water inside the tank. If either valve breaks, the toilet keeps running. <\/span><span data-preserver-spaces=\"true\">This<\/span><span data-preserver-spaces=\"true\"> means water continuously flows down into the bowl. A toilet <\/span><span data-preserver-spaces=\"true\">won\u2019t<\/span><span data-preserver-spaces=\"true\"> stop filling if parts are broken.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-4815\" src=\"https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet-300x300.jpg\" alt=\"Flushing Toilet\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet-300x300.jpg 300w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet-1024x1024.jpg 1024w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet-150x150.jpg 150w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet-768x768.jpg 768w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet-1536x1536.jpg 1536w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet-40x40.jpg 40w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet-650x650.jpg 650w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/Flushing-Toilet.jpg 2000w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/span><\/p>\n<h2><strong>Symptoms of a Running Toilet:<\/strong><\/h2>\n<ul>\n<li><span data-preserver-spaces=\"true\">Constant hissing<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Water trickling into bowl<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Tank refilling repeatedly<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Movement in overflow tube<\/span><\/li>\n<\/ul>\n<h2><strong>Common Causes of a Running Toilet<\/strong><\/h2>\n<p><span data-preserver-spaces=\"true\">Several issues can cause a running toilet cistern. The most frequent culprit is a faulty fill valve. This part controls the water entering your tank. If it breaks, water flows into the toilet cistern overflow. Another common issue is a leaking flush valve. This rubber seal can degrade over time. When it degrades, water leaks directly into the toilet bowl. Debris inside the tank can also block these valves. Sometimes, the dual flush buttons get stuck or misaligned.<\/span><\/p>\n<h2><strong>How to Fix a Running Toilet Step by Step<\/strong><\/h2>\n<p><strong>What You Need<\/strong><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">Adjustable wrench<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Sponge<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Replacement fill valve<\/span><\/li>\n<\/ul>\n<p><strong>Repair Time<\/strong><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">15\u201330 minutes<\/span><\/li>\n<\/ul>\n<p><strong>Difficulty<\/strong><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">Beginner DIY<\/span><\/li>\n<\/ul>\n<p><span data-preserver-spaces=\"true\">Follow these steps for your UK toilet plumbing repair.<\/span><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">First, turn off the water supply to the toilet. You will usually find an isolation valve nearby.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Second, remove the lid of your running toilet. Put the lid in a safe place.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Third, inspect the inside of the tank for damage. Check the water level against the overflow pipe.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Fourth, test the flush valve seal for any obvious leaks.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Fifth, clean away any dirt or debris from the seals.<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Finally, turn the water back on and test it. If the toilet <\/span><span data-preserver-spaces=\"true\">won\u2019t<\/span><span data-preserver-spaces=\"true\"> stop filling, replace the parts.<\/span><\/li>\n<\/ul>\n<h2><strong>When to Replace the Fill Valve<\/strong><\/h2>\n<p><span data-preserver-spaces=\"true\">Sometimes a simple cleaning will not stop the leak. You must replace a faulty fill valve if it breaks. If water pours into the toilet cistern overflow, replace it. You can buy replacement parts from most DIY stores. Fitting a new valve is a simple toilet cistern repair. Follow the manufacturer&#8217;s instructions carefully to avoid further leaks.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">If you want a new system, consider an upgrade. The <\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/\/ajax-limber-rimless-close-coupled-open-back-wc-with-seat\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">Ajax Limber Rimless Close Coupled Open Back WC with Seat<\/span><\/a><span data-preserver-spaces=\"true\"> is excellent. One customer left a 5-star review stating: &#8220;Very good toilet. Ensure the fill system is connected at 90 degrees to the front of the cistern, rather than as shown in the instructions. Underside of lid catches on the mechanism so the cistern keeps filling.&#8221;<\/span><\/p>\n<h2><strong>How Much Water a Running Toilet Wastes<\/strong><\/h2>\n<p><span data-preserver-spaces=\"true\">A running toilet cistern is bad for the environment. According to <\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.yorkshirewater.com\/news-media\/news-articles\/2025\/a-leaky-loo-could-be-wasting-double-your-average-daily-water-usage\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">Yorkshire Water<\/span><\/a><span data-preserver-spaces=\"true\">, a leaking toilet can waste up to 400 litres of water per day. <\/span><span data-preserver-spaces=\"true\">This<\/span><span data-preserver-spaces=\"true\"> can add hundreds of pounds to annual bills. You must fix a running toilet as soon as possible. Water conservation is incredibly important for UK households today. Do not ignore a toilet constantly running.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-4816\" src=\"https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/s-l1600-90-300x300.jpg\" alt=\"Running Toilet\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/s-l1600-90-300x300.jpg 300w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/s-l1600-90-1024x1024.jpg 1024w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/s-l1600-90-150x150.jpg 150w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/s-l1600-90-768x768.jpg 768w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/s-l1600-90-40x40.jpg 40w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/s-l1600-90-650x650.jpg 650w, https:\/\/www.showerstoyou.co.uk\/latest\/wp-content\/uploads\/2026\/05\/s-l1600-90.jpg 1200w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/span><\/p>\n<h2><strong>When to Call a Plumber<\/strong><\/h2>\n<p><span data-preserver-spaces=\"true\">Some repairs are too difficult for a quick DIY. If your running toilet cistern still leaks, call a professional. Concealed cisterns can be very hard to reach. Accessing a cistern for a <\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/sanitaryware\/toilets\/back-to-wall-pans\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">back-to-wall pan<\/span><\/a><span data-preserver-spaces=\"true\"> is tricky.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">If you need a new model, consider our options. The <\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/\/tavistock-micra-evo-rimless-back-to-wall-wc\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">Tavistock Micra Evo Rimless Back-to-Wall WC<\/span><\/a><span data-preserver-spaces=\"true\"> is brilliant. A customer left a 5-star review: &#8220;Helpful customer service and delivered on time&#8221;.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">For hidden setups, use the <\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/scudo-concealed-cistern-with-chrome-round-button-and-side-inlet\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">Scudo Concealed Cistern with Chrome Round Button and Side Inlet<\/span><\/a><span data-preserver-spaces=\"true\">. A buyer left a 5-star review: &#8220;Great price and as with all Scudo products it does the job&#8221;.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">For hygiene, try the <\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/scudo-contactless-flush-sensor\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">Scudo Contactless Flush Sensor<\/span><\/a><span data-preserver-spaces=\"true\">. A customer 5 star review says: &#8220;Quick delivery, great product. Easy to fit and works brilliantly&#8221;.<\/span><\/p>\n<h2><strong>Frequently Asked Questions<\/strong><\/h2>\n<h3><strong>Why does my toilet cistern keep running?<\/strong><\/h3>\n<p><span data-preserver-spaces=\"true\">Your constantly <\/span><span data-preserver-spaces=\"true\">filling<\/span><span data-preserver-spaces=\"true\"> cistern <\/span><span data-preserver-spaces=\"true\">keeps running<\/span><span data-preserver-spaces=\"true\"> due to broken parts.<\/span><span data-preserver-spaces=\"true\"> Usually, you have a faulty fill valve or a broken seal.<\/span><\/p>\n<h3><strong>How do I stop my toilet cistern from constantly filling?<\/strong><\/h3>\n<p><span data-preserver-spaces=\"true\">You must adjust the float or replace the fill valve. <\/span><span data-preserver-spaces=\"true\">This<\/span><span data-preserver-spaces=\"true\"> stops water from entering the toilet cistern overflow tube.<\/span><\/p>\n<h3><strong>Why is water continuously running into the toilet bowl?<\/strong><\/h3>\n<p><span data-preserver-spaces=\"true\">This<\/span><span data-preserver-spaces=\"true\"> happens when the flush valve is leaking. The water escapes the tank and enters the toilet bowl. More information can be found in our blog post titled &#8220;<\/span><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/latest\/2025\/07\/how-to-fix-a-leaking-toilet\/\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">How to Fix a Leaking Toilet<\/span><\/a><span data-preserver-spaces=\"true\">.<\/span><span data-preserver-spaces=\"true\">&#8220;<\/span><\/p>\n<h3><strong>Is a running toilet an emergency?<\/strong><\/h3>\n<p><span data-preserver-spaces=\"true\">It is not a flooding emergency, but it wastes water. You should repair the toilet cistern as quickly as possible.<\/span><\/p>\n<h3><strong>How do I know if the flapper valve is faulty?<\/strong><\/h3>\n<p><span data-preserver-spaces=\"true\">If the tank does not refill correctly or water keeps running, the valve may be faulty. You will see water constantly flowing into the bowl below.<\/span><\/p>\n<h3><strong>Can I fix a running toilet myself?<\/strong><\/h3>\n<p><span data-preserver-spaces=\"true\">Yes, a toilet repair DIY is usually very simple. You only need basic tools and a new replacement part.<\/span><\/p>\n<h3><strong>Why is my concealed cistern running constantly?<\/strong><\/h3>\n<p><a class=\"editor-rtfLink\" href=\"https:\/\/www.showerstoyou.co.uk\/sanitaryware\/concealed-cisterns\" target=\"_blank\" rel=\"noopener\"><span data-preserver-spaces=\"true\">Concealed cisterns<\/span><\/a><span data-preserver-spaces=\"true\"> suffer from the same broken valve issues. However, they are simply hidden behind a bathroom wall panel.<\/span><\/p>\n<h3><strong>Why does my toilet make a hissing sound?<\/strong><\/h3>\n<p><span data-preserver-spaces=\"true\">A hissing sound means water is escaping from a faulty fill valve. Air and water mix to create this annoying noise.<\/span><\/p>\n<h2><strong>Solve Your Plumbing Issues Today<\/strong><\/h2>\n<p><span data-preserver-spaces=\"true\">Fixing a running toilet cistern saves you money and water. A properly functioning toilet gives you total peace of mind. We encourage you to tackle this UK toilet plumbing repair. With the right parts, you can quickly stop the toilet from running. Browse and shop today for replacement parts or new toilets.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If your toilet won\u2019t stop running after flushing, you could be wasting hundreds of litres of water every day. The good news is that most running toilet problems are caused [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":4814,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[143],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/posts\/4812"}],"collection":[{"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/comments?post=4812"}],"version-history":[{"count":2,"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/posts\/4812\/revisions"}],"predecessor-version":[{"id":4817,"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/posts\/4812\/revisions\/4817"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/media\/4814"}],"wp:attachment":[{"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/media?parent=4812"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/categories?post=4812"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.showerstoyou.co.uk\/latest\/wp-json\/wp\/v2\/tags?post=4812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}