AUTOMATIC WATER SUPPLY DEVICE

PROBLEM TO BE SOLVED: To prevent the suspension of water supply even in the malfunction of electronic components such as an inverter or the like under a condition that the pressure and the capacity of a pump is less than the predetermined values and the frequency is less than the maximum frequency by instantaneously stopping an electric motor when the abnormality is judged and then operating the electric motor again. SOLUTION: A control part 16 comprises an output frequency detecting part 16c for detecting the operation frequency of motor 15 m, an operation current detecting part 16d for detecting the operation current of the motor 15 m, and a timer 16e for counting the time of the malfunction of an inverter 16b. The malfunction of the inverter 16b is judged in a case when the time under the conditions that discharge pressure of a pump 15 < predetermined pressure, capacity < predetermined capacity, operation frequency < maximum operation frequency and operation current < predetermined current, is above the predetermined time when the pump is automatically operated under the target pressure and the constant control. On this occasion, the pump 15 is forcibly stopped, and then the pump 15 is restarted after a specific time. Whereby the suspension of water supply can be prevented even in the malfunction of the inverter 16b.