How do I clean the drain pump when it is blocked?

Bosch WDU28...GB / WDU28...SN ·

Switch off the appliance and unplug it, then open the service flap and remove the drain hose from its retainer to pour out residual water into a suitable container. Carefully unscrew the pump cover, clean the interior, pump cover thread, and pump housing, ensuring the impeller can rotate freely. Refit the pump cover with the handle in a vertical position, then close the service flap. (Page 44-45)

Source: WDU28...GB / WDU28...SN Manual, Page 44

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