How do I clean the drain pump if it becomes blocked?
First, switch off the appliance and pull out the mains plug, then open the service flap. Take the drain hose out of the retainer, remove the sealing cap and pour out the water into a container, then replace the sealing cap and put the drain hose back. Carefully unscrew the pump cover (residual water may leak out), clean the interior, pump cover thread and pump housing, ensuring the impeller can rotate freely, then refit and screw on the pump cover with the handle in a vertical position and close the service flap. (Pages 44-45)
From the official Bosch WDU28 Washer Dryer manual, page 44
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