| 摘要 |
PROBLEM TO BE SOLVED: To diagnose whether or not a connection state of a flow passage selector device is normal even in a state where there is no water or hot water in a bathtub, in a hot water supply system in which the flow passage selector device is connected to a reheating circulation path.SOLUTION: In diagnosis control of a flow passage selector valve 61, in a state where an on-off valve 37 is closed, a hot water filling unit 42 is opened and hot water from a hot water supply circuit 2 is introduced to a reheating circulation path 100. Furthermore, the flow passage selector valve 61 is sequentially controlled in a first state in which ports 61a and 61b communicate, a second state in which ports 61a-61c are in non-communication with each other and a third state in which the ports 61a and the 61c communicate. A combination of presence/absence of flow in the reheating circulation path 100 in the case where the flow passage selector valve 61 is controlled in the first, second and third states respectively is different between the case where the flow passage selector valve 61 is connected normally and the case where erroneous connection is occurring. |
