[Gary838]

The water pipe in my bathroom rattles randomly without a valve being turned on. The duration can be from fifteen to thirty seconds. I can turn the cold water tap on and the water pulses until I turn the tap on to a full flow. If I flush the commode it will stop, and if I turn the hot water on it will stop the vibrating but not as quickly as turning on the cold water. The house is six years old and built on a slab so main valve is located in the house near the tankless waterheater.

[hkstroud]

Next time you hear the noise remove the top to the toilet tank, reach in and lift the float. If the noise stops, you have a faulty fill valve and a leaking flush valve. Repair or replace the fill valve. Replace the flush valve.

[speedball1]

In addition to Harolds check the water level in the tank, It should be n1/2 under the top of the white overflow tube when the fill tube shuts off. Good luck, Tom