A toilet that runs intermittently and then stops on its own is typically caused by a slow leak at the tank flapper valve. As water slowly seeps past a degraded or misaligned flapper from the tank into the bowl, the water level gradually drops until the float arm triggers the fill valve to turn on, refill the tank, and shut off once the float reaches the correct height. Verification: Listen to the tank; if you hear intermittent trickling followed by the fill valve kicking on every few minutes, the flapper is leaking.
1 votes
Marked as accepted