To provide an absorption cold/hot water combined supplying device capable of discriminating a valve defective state of a low-temperature refrigerant control valve/heated refrigerant control valve with a simple and inexpensive constitution.

This absorption cold/hot water combined supply device 100 supplies hot water 24a by controlling the heated refrigerant control valve V12 disposed between a water heater 8 and a high-temperature regenerator 1, and supplies cold water 22a by controlling the low-temperature refrigerant control valve V11 disposed between a low-temperature regenerator 2 and a condenser 3. A valve failure state of one or both of the heated refrigerant control valve V12 and the low-temperature refrigerant control valve V11 is determined, when such a state that a corresponding temperature difference additional value ΔW in use does not reaches a tolerance K to a corresponding temperature difference change value Ω, continues for a prescribed time S or more, when the change of temperature difference additional value ΔW corresponding to a valve opening α of a fuel control valve V21 of the high-temperature regenerator 1 in a normal state is the corresponding temperature difference change value Ω.

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