Detecting operational state of a dishwasher

A method of detecting an operational state of a dishwasher, the dishwasher comprising a dishwasher circulation pump, the dishwasher being configured to operate at least a first washing cycle, wherein (a) during the first washing cycle the circulation pump is caused to be operated at a first rotational speed and (b) the first washing cycle corresponds to a first operational state, the method comprising the steps of:

• causing operation of a motor driving the dishwasher circulation pump to operate the dishwasher circulation pump at a second rotational speed, the second rotational speed differing from the first rotational speed;
• measuring operating current of the motor driving the dishwasher circulation pump in response to causing operation of the motor driving the dishwasher circulation pump at the second rotational speed;
• determining whether the dishwasher operates in a second operational state differing from the first operational state based on the measured circulation pump motor operating current at the second rotational speed, wherein the second rotational speed is selected based on a change in operating current of the motor being more easily detected at the second rotational speed than at the first rotational speed.