| 摘要 |
PROBLEM TO BE SOLVED: To specify the abnormal cause of a second heating operation by specifying either the closure of a circulation path or the fault of a circulating pump, etc., based on the detection result of a pressure sensor, a bath thermistor and a water flow switch. SOLUTION: A CPU 9, when hot water pouring being started, measures a being started, measures a time t1 until hot water temperature detected by the bath thermistor 7 starts to change after the pressure sensor 5 detects hot water pressure. When difference|t1 -t0|between the time t1 and a time t0 measured when a hot water supplier is installed and stored in an EEPROH 10 is within an allowable time rangeΔt, the difference p1 of pressure detected by the pressure sensor 5 in the driving/non-driving state of the circulating pump is measured in a state in which a bathtub is filled with hot water to a prescribed level. It is judged whether or not the difference between pressure difference p0 when the hot water supplier is installed is within tolerance, and when it is, a time until a bath water flow switch 8 is turned on after the circulating pump is driven is measured, and it is judged whether or not it is within the tolerance. The closure of the circulation path and the fault of the circulating pump, etc., in each step are displayed on a display part 12.
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