If you are running a selenoid and a float valve, ill bet the selenoid is the culprit.
It is the membrane in the selenoid that detects pressure from one side to the other.
sometimes when the float valve is just barely letting water out the seleniod will hum, because the pressure is so close to being equal inside it.
Does the squeal sort of get higher and higher pitched until it completley stops ?
Theres a few ways to correct this, lemme know if you have one on there.
Marc.
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