A control valve assembly capable of being in fluid communication with a point of entry, a point of use, and a fluid treatment device, the point of entry providing a supply fluid, the fluid treatment device including a treatment inlet port for receiving the supply fluid and a treatment outlet port for supplying a treated fluid, the control valve assembly comprising: a controller; a valve body; a valve seated within the valve body and movable between an operating position and a fault position; a motor in communication with the controller and coupled to the valve to move the valve between the operating position and the fault position; and a sensor in communication with the controller, the sensor providing a fault signal to the controller indicating a fault condition of the control valve assembly; and wherein the valve body includes: a supply port in fluid communication with the point of entry to direct the supply fluid from the point of entry to the valve body; an outlet port in fluid communication with the treatment inlet port to direct the supply fluid from the valve body to the fluid treatment device; an inlet port in fluid communication with the treatment outlet port to direct the treated fluid from the fluid treatment device to the valve body; and a service port in fluid communication with the point of use to direct at least one of the supply fluid and the treated fluid from the valve body to the point of use; wherein the operating position includes a blend position at which both the supply fluid and the treated fluid are directed through the service port so that a blended fluid including the supply fluid and the treated fluid is directed from the valve body to the point of use; characterized in that the control valve assembly comprises an energy reserve coupled to at least one of the controller and the motor; wherein the fault signal is adapted to indicate a line energy loss to the control valve assembly and the energy reserve is adapted to supply energy to the controller and the motor so that the controller controls the motor to drive the valve to the fault position; and wherein the controller operates the motor to drive the valve to the fault position in response to the fault signal, the controller monitoring the sensor during the fault condition and operating the motor to drive the valve to the operating position if the fault condition has been corrected. a controller; a valve body; a valve seated within the valve body and movable between an operating position and a fault position; a motor in communication with the controller and coupled to the valve to move the valve between the operating position and the fault position; and a sensor in communication with the controller, the sensor providing a fault signal to the controller indicating a fault condition of the control valve assembly; and wherein the valve body includes: a supply port in fluid communication with the point of entry to direct the supply fluid from the point of entry to the valve body; an outlet port in fluid communication with the treatment inlet port to direct the supply fluid from the valve body to the fluid treatment device; an inlet port in fluid communication with the treatment outlet port to direct the treated fluid from the fluid treatment device to the valve body; and a service port in fluid communication with the point of use to direct at least one of the supply fluid and the treated fluid from the valve body to the point of use; a supply port in fluid communication with the point of entry to direct the supply fluid from the point of entry to the valve body; an outlet port in fluid communication with the treatment inlet port to direct the supply fluid from the valve body to the fluid treatment device; an inlet port in fluid communication with the treatment outlet port to direct the treated fluid from the fluid treatment device to the valve body; and a service port in fluid communication with the point of use to direct at least one of the supply fluid and the treated fluid from the valve body to the point of use; wherein the operating position includes a blend position at which both the supply fluid and the treated fluid are directed through the service port so that a blended fluid including the supply fluid and the treated fluid is directed from the valve body to the point of use; characterized in that the control valve assembly comprises an energy reserve coupled to at least one of the controller and the motor; wherein the fault signal is adapted to indicate a line energy loss to the control valve assembly and the energy reserve is adapted to supply energy to the controller and the motor so that the controller controls the motor to drive the valve to the fault position; and wherein the controller operates the motor to drive the valve to the fault position in response to the fault signal, the controller monitoring the sensor during the fault condition and operating the motor to drive the valve to the operating position if the fault condition has been corrected.