Originally Posted by speedball1
Good morning Srni,
I wish you would have been a little more descriptive about whether it did it more on cold then hot. If cold then one of the first places I would look is the toilet tank. To check this open up the lid and turn on and off the cold water faucet on the lavatory while watching the float ball in the tank. Did the float ball bounce up and down causing the ballcock to kick on for a second causing the water level in the tank to overflow into the white overflow tube? If so the tank level's set too high. the water level in the tank should be 1/2" below the top of the overflow tube when the tank's filled. If that wasn't it then you're going to have to track it down be ear. good luck, Tom