You have to check inside the cistern. Various valves may be contributing to leaking and constant running.
See this article:
https://www.familyhandyman.com/plumbing/toilet-repair/parts-of-a-toilet/view-all/
SOURCE: Modern toilet cisterns without overflowprovision
Most modern flush units have built in overflow protection, if the water level rises above the flush device then water runs into the toilet itself rather than out of the overflow pipe to the outside as in older toilets.
You could always check by taking the top off the cistern and push down the float device with your finger to see what happens!
hope this helps
SOURCE: Toilet won't stop running
I have a Kohler toilet and Ingenium fill valve
85297-AA. My toilet kept running, the fill valve black cylinder
wouldn't pop up and when I added blue food coloring to the tank, the
blue color seeped through to the toilet bowl. First I replaced the
flapper and that allowed the fill valve piece on the cylinder to pop up
correctly and blue dye no longer seeped through to the bowl. I still heard a hissing sound when the toilet tank had
filled and no water was going into the overflow tube. I called the tech
support number on the Kohler website 1-800-4KOHLER (1-800-456-4537) .
Here's what solved the problem: Turn off the water to the toilet.Take
off the white cap of the fill valve by pushing it down and turning it
counterclockwise as you would open up a childproof pill container. Then
unhook the metal hook. Hold a cup upside down (I used a strong plastic
cup) over the part of the fill valve that is left in the tank and turn
on the water. (You need the cup because otherwise the water will squirt
up to the ceiling.) The water will flush out the fill valve. Replace
the cap and the hook and flush.
SOURCE: Water flows unneccessary from the cistern in the
All you need to do is replace the tank flapper.
Testimonial: "Thanks for the tip.Flapper was fine,than I noticed that the round rubber seal was getting stuck.Cheapest solution - petroleum jelly...as good as new!"
SOURCE: cistern leak
The flapper valve(ball)seat is not sealing. Needs a new seat and flapperat bottom of tank. -Ned-
SOURCE: Water leakes continually into the toilet bowl from
the flapper is not sealing or the water level is set to high and you will need to lower the float. you will not need any parts to adjust the water level and the flapper is under $10.00. Click on the bellow link to see the parts diagram. http://www.google.com/imgres?imgurl=http://www.hometips.com/articleimages/20070913131246_plb_toilet_componentsdiagram1.gif&imgrefurl=http://www.hometips.com/how-it-works/toilet-plumbing-diagram.html&h=428&w=353&sz=34&tbnid=-jD50OHr-goZAM:&tbnh=247&tbnw=204&prev=/images%3Fq%3Dhow%2Ba%2Btoilet%2Bworks%2Bdiagram&hl=en&usg=__WY8gJuebzTLRKmtC489ClS9UH3s=&sa=X&ei=AikpTJXJHIK0lQf66vSCCA&ved=0CBsQ9QEwAA
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