My Toilet Flush Valve Does Not Close Properly

If the flush valve is not sealing the water in the tank and causes a constantly running toilet, this may be due to the following issues.

NOTE: Before proceeding with any work, turn off the water supply to the toilet at the shut-off valve and flush the toilet to empty the tank as much as possible.

Remove the tank cover and set it aside, and follow the steps below:

• For a single flush tank lever-triggered flush valve
• For a single or dual flush push-button triggered flush valve

If your flush valve is a single flush tank lever-triggered flush valve that uses a traditional flapper:

• Observe the flush valve assembly, the flapper and the chain connecting to the tank lever. Verify if there are any obstructions or debris that may prevent the flapper from forming a tight seal. As well, ensure the flapper chain is not tangled or broken. If you recently replaced the flapper or adjusted the flapper chain, verify if there is sufficient slack to allow the flapper to properly lift and close to seal.
• If the issue is not resolved after removing any debris or obstructions, remove the flapper from the flush valve by unhooking it from the peg at each side of the flush valve.
• Check the flapper for any signs of wear and tear, i.e. cracks, warping or deterioration. Over time, the rubber or silicone can degrade and lose its ability to create a proper seal. If so, the flapper will need to be replaced.
• After the flapper is removed, observe the base seat of the flush valve for any sign of damage or warping. If there is any visible damage to the flush valve, the flush valve assembly will need to be replaced.
• Reinstall all components and test again.

If your flush valve is a single flush or dual flush push-button triggered flush valve that uses a traditional flapper:

• Observe the cylindrical canister-type flush valve assembly, the top cap with buttons, around the canister, and the gasket seal at the bottom. Verify if there are any obstructions or debris that may prevent the flapper from forming a tight seal.
• The canister-type flush valve assembly usually has a base seat and a top canister, which can be separated from each other by unlocking the top canister from the locking mechanism, and then twisting and lifting the top canister to remove it. Once removed, you will be able to access the gasket seal at the bottom of the canister. Check the gasket seal for any signs of wear and tear, i.e. cracks, warping or deterioration. Over time, the gasket seal can degrade and lose its ability to create a proper seal. If so, the gasket seal or, in some cases, the flush valve assembly will need to be replaced.
• Ensure the entire flush valve assembly is sitting straight and that the seal is aligned correctly with the tank outlet. After the top canister is removed, observe the base seat of the flush valve for any sign of damage or warping. If there is any visible damage to the flush valve, the flush valve assembly will need to be replaced.
• Check the push-button mechanism on the tank cover. Gently push the flush button and see if the stem moves freely and returns to its resting position smoothly. Look for any signs of binding, sticking, damage or obstructions in the push-button assembly.
• If you notice any sticking in the push button mechanism, we suggest lubricating the rubber ring on the bottom of the flush valve with silicone-based plumbers' grease. Be careful not to get lubricant on any rubber seal, as this could cause it to degrade.
• Reinstall all components and test again.

If the issue persists after you've gone through these steps, it might indicate a more complex problem with the flush valve assembly or potentially other elements of your toilet. Reach out to a licensed plumber for professional assistance. Or if you require any further assistance in identifying the part needed, you may reach out to our customer care team.