Coffee machine, - having a water tank, which communicates fluidically with a functional component by means of a water pipe so that water available in the water tank can be introduced into the functional component by means of the water pipe, - having a conveying facility arranged in the water pipe for conveying water out of the water tank into the functional component, - having a heating facility arranged in the water pipe between the conveying facility and the functional component for heating the water flowing through the water pipe, - having a bypass valve, by way of which water can be guided past the conveying facility when the bypass valve is in an open position, - having a stop valve arranged in the water pipe between the heating facility and the functional component, said stop valve closing off the water pipe in a closed position, so that no water can flow from the heating facility into the functional component, - wherein the coffee machine has a container for a care fluid, which opens into the water pipe between the water tank and the heating facility, in particular in the region of the bypass valve, - wherein the coffee machine comprises a control/regulation facilty, by means of which the bypass valve can be moved between the open position and a closed position, in which no water can be guided past the conveying facility, and by means of which the stop valve can be moved between the closed position and an open position, in which water can flow from the heating facility into the functional component, - wherein the coffee machine can be moved into a first operating state and into a second operating state by means of the control/regulation facility, - wherein in the first operating state, the control/regulation facility is used to move the bypass valve into the closed position and the stop valve into the open position, - wherein in the second operating state, the control/regulation facility is used to move the bypass valve into the open position and the stop valve into the closed position. - having a water tank, which communicates fluidically with a functional component by means of a water pipe so that water available in the water tank can be introduced into the functional component by means of the water pipe, - having a conveying facility arranged in the water pipe for conveying water out of the water tank into the functional component, - having a heating facility arranged in the water pipe between the conveying facility and the functional component for heating the water flowing through the water pipe, - having a bypass valve, by way of which water can be guided past the conveying facility when the bypass valve is in an open position, - having a stop valve arranged in the water pipe between the heating facility and the functional component, said stop valve closing off the water pipe in a closed position, so that no water can flow from the heating facility into the functional component, - wherein the coffee machine has a container for a care fluid, which opens into the water pipe between the water tank and the heating facility, in particular in the region of the bypass valve, - wherein the coffee machine comprises a control/regulation facilty, by means of which the bypass valve can be moved between the open position and a closed position, in which no water can be guided past the conveying facility, and by means of which the stop valve can be moved between the closed position and an open position, in which water can flow from the heating facility into the functional component, - wherein the coffee machine can be moved into a first operating state and into a second operating state by means of the control/regulation facility, - wherein in the first operating state, the control/regulation facility is used to move the bypass valve into the closed position and the stop valve into the open position, - wherein in the second operating state, the control/regulation facility is used to move the bypass valve into the open position and the stop valve into the closed position.