Phenomenon causes non-stop over the upper limit 1, the tank pressure is too high 2, the pressure switch failure or damage 3, the pressure gauge failure or damage does not start over the lower limit 1, the power supply voltage is low 2, the pump motor damage 3, the tank pressure Is too low 4, pressure gauge damage tank start frequency 1, the wrong type, water consumption is too large, small equipment, overload 2, water valve failure 3, the tank gas is too small Note: 1, Sewage once 2, winter outdoor anti-bump insulation