How to Fix a Running Toilet with Two Buttons

Everyone · How-to · Updated October 1, 2026 · LearnLife Editorial

What do you need before fixing a running toilet with two buttons?

Before beginning repairs, gather a few essential tools and supplies to make the process smoother. You will need an adjustable wrench or pliers to turn off and on the water supply valve and to loosen any nuts inside the tank. A flathead and Phillips-head screwdriver are useful for removing and adjusting internal components. Have a sponge or towel nearby to mop up any water spills when removing the tank lid or working inside. A flashlight helps you see inside the tank clearly, especially if your bathroom lighting is dim. Wearing disposable gloves protects your hands from dirt and bacteria.

For replacement parts, it’s helpful to have the model number of your toilet, often found inside the tank or under the lid, to purchase the correct flush valve, flapper, or button mechanism. If you don’t have the model, take clear photos of the internal parts and bring them to a hardware store to find matching replacements. A small mirror can also help inspect tricky spots inside the tank.

Finally, locate the water shutoff valve behind or below the toilet bowl. Before starting, turn this valve clockwise to stop water flow. Having a bucket ready to catch any water when you disconnect parts is a good precaution.

Why is the toilet running when it has two buttons?

Two-button toilets feature a dual flush system, allowing a partial flush for liquids and a full flush for solids. This system usually involves a flush valve with two buttons linked to separate valves or a dual valve assembly. The running toilet problem typically arises when the valve does not seal properly or the buttons stick, allowing water to leak continuously from the tank into the bowl.

Common causes include:

• Worn or warped seals around the flush valve or flapper causing water to seep past.
• Mineral deposits or dirt preventing valves from closing tightly.
• Buttons or linkages that get stuck or do not fully return to their resting position.
• Incorrect water level in the tank, causing overflow into the overflow tube.

A running toilet wastes water and can increase your water bill. Unlike single-lever toilets, dual-button systems have more moving parts that can misalign or wear out. Understanding which component is malfunctioning helps target the repair and avoid replacing parts unnecessarily.

What are the step-by-step instructions to fix a running two-button toilet?

Follow these detailed steps to stop your running toilet:

1. Turn off the water supply: Locate the shutoff valve near the toilet base and turn it clockwise until it stops. Flush the toilet to empty the tank as much as possible. This prevents water from continuously flowing while you work.

1. Remove the tank lid carefully: Set it aside on a soft surface to avoid cracks. This gives you access to the internal mechanism.

1. Inspect the flush buttons and linkage: Press each button separately and watch the movement inside. The buttons should move smoothly up and down and release fully without sticking. If they feel sticky or don’t return, clean around the button mechanisms and check for broken or bent linkages.

1. Examine the flush valve and seals: The flush valve is usually located under the buttons, sometimes with a rubber or silicone seal called a flapper or diaphragm. Check for cracks, tears, or warping. Mineral buildup can also prevent a tight seal.

1. Clean mineral deposits and debris: Use a damp sponge or soft cloth to wipe around seals and valve seats. Avoid abrasive cleaners that can damage rubber parts.

1. Adjust water level in the tank: Look for the float mechanism—either a ball float or a cup float around the fill valve. Adjust the float by gently bending the rod or sliding the float down to lower the water level. The water should be about an inch below the overflow tube to prevent continuous running.

1. Replace worn parts if needed: If cleaning and adjustment don’t fix the leak, buy replacement parts. Most toilets require a specific flush valve or flapper designed for dual flush systems. Remove the old part by unhooking chains or unscrewing nuts, then install the new part following package instructions.

1. Turn the water back on: Slowly open the shutoff valve by turning it counterclockwise. Let the tank fill and listen for leaks or running water.

1. Test both flush buttons: Press the small flush button and then the large flush button separately. Each should cause the toilet to flush and the water to stop running shortly after.

1. Replace the tank lid securely: Once you confirm the running has stopped, put the lid back carefully.

How can you tell if the fix worked?

After completing your repairs, test the toilet's function thoroughly. Flush the toilet using the small button and observe the water flow. It should stop filling the tank once it reaches the correct level, usually about an inch below the overflow tube. Then try the large button for a full flush and watch for the same behavior.

Listen carefully after each flush. A properly fixed toilet will stop making any water flow or hissing sounds within a few seconds. If water continues to flow, the flush valve may not be sealing properly, or the water level might be too high.

Check inside the tank for any signs of water leaking around seals or valves. The tank should refill to the same level every time without overflowing into the overflow tube. Also, flush multiple times to confirm consistent performance.

Keeping a dry floor around the toilet after flushing is another good indicator that the fix worked since leaks often cause dampness near the base.

What should you do if the toilet still runs after fixing it?

If the toilet continues running after your repair efforts, don’t panic. Return to the tank and inspect parts closely again. The problem might be a subtle misalignment of the flush buttons or a chain inside the tank that’s too tight or tangled, preventing the flapper from seating fully.

Try these troubleshooting tips:

• Ensure the chain or cable connected to the flush valve is slack enough to allow the valve to close completely.
• Double-check that the water level is not too high, which can cause water to spill into the overflow tube.
• Remove and clean or replace the flush valve seals again if you see visible damage.
• Check for cracks or damage in the flush valve body itself; a cracked valve means replacement.

If your toilet has a diaphragm-type valve, it may require more careful replacement or adjustment than a standard flapper. If unsure or unable to fix the problem, contacting a plumber is advisable. Persistent leaks may waste significant water and cause damage over time.

Avoid using temporary fixes like tape or glue on seals, as these can worsen problems or cause leaks elsewhere.

How is fixing a dual-button toilet different from a traditional flush?

Traditional toilets typically have one lever and a single flapper valve that lifts and drops to flush. Fixing running issues mainly involves adjusting the ball float, replacing the flapper, or fixing the chain. Two-button toilets have a more sophisticated system with two flush volumes, which means they have either a dual flush valve or two separate valves operated by buttons.

This design requires attention to the button mechanisms and more complex internal linkages. Parts like the dual flush valve may include rubber diaphragms or canister-style valves rather than a simple flapper. These parts can be more expensive and less universally compatible than traditional flappers.

Because of the dual mechanism, it’s important to test both buttons independently and ensure that neither causes running. Faults can appear in one button’s mechanism while the other works fine.

For those familiar with traditional flush systems, it helps to consult model-specific guides or videos since the internal layout differs. For more on traditional flapper repairs, see [] and for top flush systems, see [].

What regular maintenance helps prevent running toilets?

Regular cleaning and inspection of the toilet tank can prevent running problems. Mineral deposits from hard water can build up on seals, valves, and buttons, causing them to stick or fail. Using a mild vinegar solution monthly can help dissolve deposits without damaging rubber parts.

Check the water level and float position quarterly to ensure proper filling. Adjust the float as needed to keep water from overflowing. Test both flush buttons regularly to confirm smooth operation.

Replace worn rubber seals or flappers every few years before they become brittle and leak. Avoid using harsh chemical cleaners or drop-in tablets in the tank, as they can degrade seals and cause leaks.

Keeping the toilet clean and dry inside the tank also prevents corrosion and prolongs component life. For detailed cleaning tips, see [] and [].

Frequently asked questions

Can I fix a running toilet if I don’t know the model?

Yes, many internal parts are similar across brands. Taking photos and measurements helps find replacements. Hardware store staff can often help identify compatible parts without a model number.

How long does it take to fix a running two-button toilet?

Simple cleaning and adjustment may take 15-30 minutes. Replacing parts can take 30-60 minutes depending on experience and tools.

Will toilet cleaners damage the flush mechanism?

Harsh chemicals can degrade rubber seals and flappers, causing leaks. Use mild cleaners and avoid drop-in tablets inside the tank.

What if the buttons don’t fully depress or get stuck?

Mineral buildup or broken linkages can cause sticking. Clean the button assembly and inspect for damage. Replace parts as needed.

Is it safe to use DIY fixes like tape on leaks?

Temporary fixes can cause more damage or leaks. It’s better to replace faulty parts with proper replacements for a lasting fix.