How to get access to a Bosch dishwasher drain impeller

Written by ian kelly
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How to get access to a Bosch dishwasher drain impeller
Save money by replacing a faulty Bosch dishwasher drain pump yourself. (Jupiterimages/ Images)

Although Bosch dishwashers are renowned for their efficiency and reliability, like all domestic appliances, electrical and mechanical parts can wear out after extended use. If your machine stops draining, your drain pump has probably failed. Accessing the part is fairly complicated; nevertheless, if you have basic do-it-yourself skills you can save money my installing a replacement yourself.

Skill level:
Moderately Easy

Things you need

  • Nut driver handle
  • Set of Torx head screwdriver attachments
  • Bosch dishwasher pump - part No. 642239

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  1. 1

    Turn off the power to your dishwasher by either tripping the electrical breaker switch or removing the relative fuse on your household electrical panel.

  2. 2

    Remove the lower front panel by undoing the mounting screws on each side with a nut driver handle fitted with a Torx head screwdriver attachment.

  3. 3

    Open the dishwasher door and remove the Torx head screws on both sides securing the outer panel to the door. Close the door. Grasp the door panel by its sides and pull it downwards to remove it.

  4. 4

    Undo the two screws securing the narrow inner access plate spanning the top of the opening. Unhook the access plate from the harness support and lay it on one side. Remove the grey sound dampening pad behind the plate to reveal the drain pump.

  5. 5

    Unhook the ribbed fill hose from its retaining clip on the front of the opening. Pull one end of the hose out of the water inlet port on the front of the pump and the other end out of the air pressure chamber on the upper left of the opening.

  6. 6

    Depress the retaining tabs on the sides of the wiring harness plug attached to the pump and disconnect the plug by pulling it out of the socket. Release the locking tab on inside top of the pump by pressing it inwards with your thumb. Grasp the drain pump firmly and rotate it a quarter turn clockwise to uncouple it from the sump; this will reveal the non-replaceable pump impeller protruding from the front of the pump.

  7. 7

    Insert the new drain pump into the opening and align it with the tabs on the side of the opening. Apply inward pressure and rotate the pump a quarter turn anticlockwise to lock it into place.

  8. 8

    Reconnect the wiring harness plug to the new pump and reassemble the dishwasher by reversing the procedures carried out in steps 2 to 6.

  9. 9

    Turn the power back on and run a full washing cycle to ensure that the new dishwasher drain pump is working properly.

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