A device for negative pressure wound therapy including a pumping device, the device for negative pressure wound therapy comprising: a pump configured to provide negative pressure to a negative pressure wound therapy bandage; a pressure sensor configured to determine negative pressure created in the negative pressure wound therapy bandage; and a controller configured to: determine a target negative pressure associated with a pre-set therapeutic negative pressure, the target negative pressure (102,130) being less than the pre-set therapeutic negative pressure; cycle the pump on and off to create a negative pressure in the negative pressure wound therapy bandage; obtain, from the pressure sensor, a plurality of samples of the negative pressure created in the negative pressure wound therapy bandage, each sample being obtained at a first set time interval; calculate an average of a predetermined number of consecutive samples; compare the calculated average to the target negative pressure; and characterised in that the controller is configured to continue to cycle the pump on and off until the calculated average is greater than the target pressure (102,130) and is further configured to: after it has been determined that the calculated average is greater than the target pressure (102,130) after a complete off cycle, sample the negative pressure created in the negative pressure wound therapy bandage at a second set time interval greater than the first set time interval. a pump configured to provide negative pressure to a negative pressure wound therapy bandage; a pressure sensor configured to determine negative pressure created in the negative pressure wound therapy bandage; and a controller configured to: determine a target negative pressure associated with a pre-set therapeutic negative pressure, the target negative pressure (102,130) being less than the pre-set therapeutic negative pressure; cycle the pump on and off to create a negative pressure in the negative pressure wound therapy bandage; obtain, from the pressure sensor, a plurality of samples of the negative pressure created in the negative pressure wound therapy bandage, each sample being obtained at a first set time interval; calculate an average of a predetermined number of consecutive samples; compare the calculated average to the target negative pressure; and characterised in that the controller is configured to continue to cycle the pump on and off until the calculated average is greater than the target pressure (102,130) and is further configured to: after it has been determined that the calculated average is greater than the target pressure (102,130) after a complete off cycle, sample the negative pressure created in the negative pressure wound therapy bandage at a second set time interval greater than the first set time interval. determine a target negative pressure associated with a pre-set therapeutic negative pressure, the target negative pressure (102,130) being less than the pre-set therapeutic negative pressure; cycle the pump on and off to create a negative pressure in the negative pressure wound therapy bandage; obtain, from the pressure sensor, a plurality of samples of the negative pressure created in the negative pressure wound therapy bandage, each sample being obtained at a first set time interval; calculate an average of a predetermined number of consecutive samples; compare the calculated average to the target negative pressure; and characterised in that the controller is configured to continue to cycle the pump on and off until the calculated average is greater than the target pressure (102,130) and is further configured to: after it has been determined that the calculated average is greater than the target pressure (102,130) after a complete off cycle, sample the negative pressure created in the negative pressure wound therapy bandage at a second set time interval greater than the first set time interval.