What causes my toilet to run periodically?
What causes my toilet to run/flush periodically? It makes a slight overflow sound for a few seconds, about once an hour.
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Usually, changes or variations in city water pressure is what causes toilets to run intermittently. The valve, which shuts off the water to the toilet, is controlled by a float. The tank fills, lifting the float, which eventually shuts of the water but the valve is barely closed. A surge in city water pressure will be enough to overcome the pressure holding the valve closed, and a little more water sneaks into the tank. Depending on the valve, you may be able to adjust the valve or the float to prevent or reduce further occurrences.
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