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Most toilets are controlled by float valves that start filling the tank when the water level drops. If the toilet is filling repeatedly without the toilet being flushed, then your problem is the stopper flap that is located at the bottom of the water tank on the back of the toilet. It probably has a small leak that is causing the water level to drop, which causes the float to fall, therby opening the fill valve which refills the tank after a flush. Try to see if the chain that is attached to the handle is stuck in the opening, or if there is some obvious reason why the flap is not sealing properly. Your problem can most likely be fixed by replacing the flap valve. 545Bad flapper. Easy to repair, no plumber needed.
A leaking flapper is the most common reason. The toilet drains slowly down to the point where the fill float does its job to fill back up. The flapper is the plug at the bottom of the tank that, that leads to the bowl and should be changed at least once a year. You will save hundreds if not thousands of gallons a year.
The flapper that holds the water in the tank is likely curled up from age, or has something stuck under it like a part of the pull chain. Another reason could be that the valve is stuck open because the float is not set properly, this being the more likely reason, since if the flapper were leaking, the toilet would fill up quickly, then drain for a little while, causing it to fill again in a never ending cycle.
I wonder what made the above person take it for granted it was a toilet tank and not a flushometer??
Assuming in plumbing is not really a good thing as a flushometer can have a bad diaphragm or piston assembly
There is also an OVER Flow tube in a tank that may have defective threads that are going into the Douglas valve
ALSO if the REFILL tube is below the tank fill valve the vacuum breaker will discharge down the over flow
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