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How to Fix a Running Toilet

Do you have a constant or intermittently running toilet? Let's troubleshoot this and get it fixed. If your toilet keeps running, there are a couple of potential issues your toilet may have. The first, and most common, is a leaky flapper. Different parts of the country deal with different types of water. From harsh municipality chemicals to well water, all wreak havoc on the life of a toilet flapper. The most common, and quickest fix is to replace your leaking toilet flapper. The second common cause is due to a malfunctioning fill valve. If your fill valve has an external float, build-up can cause the float to stick and prevent your fill valve from turning off or turning on. 

Choose from the following options: 

  1. Learn how to identify your toilet symptoms - Video and step-by-step instructions below.
  2. Click find part to find the correct replacement flapper and fill valve for your toilet.
  3. If this doesn't quite describe your toilet issue, choose from the other common troubleshooting topics.

Does this describe your toilet issue?

Yes! Find a Part or

Step 1

Check out the video to learn how to fix your running toilet.

Step 2

Video didn't help? Check out the step-by-step instructions below.

Step 3

You can always give our customer service team a call too...We are here and happy to help! Simply call: 1-800-528-3553 - we are available Monday through Friday, 7:30 AM to 5:00 PM CST. 

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How to Replace a Korky® Toilet Flapper

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How to Clean & Service a Korky QuietFill Toilet Fill Valve
Constant or Intermittently Running Toilet
How to Replace a Korky® Toilet Flapper

STEP 1: More times than not, your flapper is the cause to your running toilet. As the flapper slowly leaks, it causes the fill valve to do it's job and that's why you hear your fill valve running. Test if your flapper is leaking by marking the water level of your tank with a pencil.

STEP 2: Turn your water supply off. Wait for a minimum of 25 minutes. If your water level drops below the pencil mark, you have a leak in your tank.

STEP 3: Leave the water off for a couple hours and see where the water level drops to. If the water level drops to the flapper, your flapper is leaking and needs to be replaced. If it drops to a point on your overflow tube or your tank drained completely, your flush valve needs to be replaced.

STEP 4: If your tank is not leaking, but your toilet is constantly running or water is rising into flush valve overflow tube, your fill valve is malfunctioning and needs to be replaced or serviced. Did you know Korky replace old technology too?

STEP 5: If this didn't solve your running toilet issue, maybe it's time to service your fill valve. This is a quick disassemble of the fill valve, without removing it from your toilet and cleaning it out to ensure it works properly. Check out how: here.