There are two reasons why the electric water heater beeps: First, when the machine is heating, steam is generated due to the high temperature inside the machine, and the pressure inside the machine increases. In order to protect the inner tank of the machine from being damaged due to the increase in pressure, the manufacturer will Install a pressure relief valve at the water inlet, which will cause buzzing when the pressure is released; the other is that there is leakage in the water pipe joint, which will cause cavitation when the water is boiled, causing a tremor.