Toilet Leaking From Cistern When Flushed

Toilet Leaking from Cistern When Flushed: Troubleshooting and Fixes

A leaky toilet cistern is a frustrating and costly problem. Not only is it wasteful, constantly draining water and increasing your water bill, but it can also lead to significant damage over time if left unaddressed. This article will guide you through diagnosing why your toilet cistern is leaking when flushed and offer practical solutions to fix the problem. We'll cover common causes and provide step-by-step instructions to help you get your toilet back in working order.

Identifying the Source of the Leak

Before you begin any repairs, it's crucial to pinpoint the exact location of the leak. Is it leaking from the base of the cistern, the overflow pipe, or somewhere else? This will help you determine the most likely cause. Common areas of concern include:

• The Flush Valve: This is the most frequent culprit. The flush valve is responsible for releasing water into the toilet bowl. Leaks here often manifest as a constant trickle or a steady stream of water after flushing.
• The Fill Valve: This valve controls the refilling of the cistern after flushing. Leaks from this valve usually occur while the cistern is refilling.
• The Ballcock: In older cisterns, a ballcock (a float-operated valve) regulates the water level. A faulty ballcock can lead to continuous overflowing.
• The Cistern Seals and Gaskets: Worn-out seals and gaskets can cause leaks around the various joints and connections within the cistern.
• Cracked Cistern: Less common, but a cracked cistern requires professional replacement.

Common Causes and Solutions

Here's a breakdown of some frequent issues and how to address them:

1. Faulty Flush Valve:

• Problem: The flush valve seal is worn or damaged, preventing it from sealing properly after flushing.
• Solution: Replace the flush valve assembly. This is often a straightforward DIY repair, involving unscrewing the old valve and installing a new one. Ensure you select a replacement compatible with your cistern model. Many hardware stores sell universal replacements.

2. Leaky Fill Valve:

• Problem: The fill valve diaphragm or seals are worn or damaged, leading to a constant trickle of water.
• Solution: Replace the fill valve. Like the flush valve, replacing this component is generally a straightforward task. Turn off the water supply before starting.

3. Incorrect Water Level:

• Problem: The water level in the cistern is too high, causing overflow.
• Solution: Adjust the fill valve height. Most fill valves have an adjustable float arm; lowering the float will reduce the water level.

4. Worn-out Seals and Gaskets:

• Problem: Old seals and gaskets around the flush valve, fill valve, and other cistern components can become brittle and cracked, causing leaks.
• Solution: Replace the affected seals and gaskets. These are relatively inexpensive and readily available at hardware stores.

5. Cracked Cistern:

• Problem: A crack in the cistern allows water to leak constantly.
• Solution: Unfortunately, a cracked cistern typically requires replacement. This is a more involved job that might be best left to a professional plumber.

Prevention and Maintenance

Regular maintenance can significantly reduce the risk of a leaky cistern:

• Check the water level regularly: Ensure the water level is within the manufacturer's recommended range.
• Inspect seals and gaskets: Look for signs of wear and tear and replace them as needed.
• Clean the cistern periodically: Remove any debris that might interfere with the proper functioning of the valves.

By following these steps and understanding the potential sources of leaks, you can effectively troubleshoot and repair a leaky toilet cistern, saving water and money in the process. Remember to always turn off the water supply before starting any repair work. If you're unsure about any aspect of the repair, it's always best to consult a qualified plumber.