Method of controlling a circulation pump in an appliance for washing and rinsing goods

An appliance comprising a dish washer or a washing machine for washing and rinsing goods, comprising:

• a circulation pump;
• a sensing arrangement arranged to measure an indication of circulation pump pressure or process water flow rate through the circulation pump, wherein the sensing arrangement comprises a resistor arranged in a motor driving the circulation pump, through which resistor operating current of the motor is measured, in order to attain an indication of circulation pump pressure or process water flow rate through the circulation pump;
• and
• a controller arranged to control operating speed of the circulation pump, wherein the controller further is arranged to:
• detect that the indicated circulation pump pressure or process water flow rate through the circulation pump is insufficient;
• select a reduction process from the group consisting of (a) ramping down the operating speed of the circulation pump, (b) a stepwise reduction of the operating speed of the circulation pump comprising a plurality of reducing steps, and (c) a combination of ramping down the operation speed and stepwise reduction of the operating speed of the circulation pump;
• and to
• reduce operating speed of the circulation pump using the selected reduction process until the indicated circulation pump pressure or the process water flow rate through the circulation pump is at a sufficient operational level (TOP).