An appliance for making a beverage comprising: a conduit defining a liquid flow path for the liquid; a pump to move the liquid under pressure along the flow path and configured to operate in a first mode and a second mode, different to the first mode, a sensor assembly configured to determine a first flow rate of the liquid in the flow path when the pump operates in the first mode and determine a second flow rate when the pump operates in the second mode; and a controller operatively coupled with the pump and the sensor assembly and configured to cause the pump to switch from the first mode to the second mode if the first flow rate is below a first threshold and to cause the pump to switch from the second mode to the first mode if the second flow rate is above a second threshold. In the second mode, the pump causes the liquid to move under increased pressure than in the first mode to at least aid in resolving cavitation. A method of controlling the appliance to make a beverage is also disclosed.