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Customer Questions and Answers for Wax Motor (Dishwasher Rinse Aid Dispenser) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18040821
Manufacturer Part Number: WP902899

This wax motor is the actuator for the dishwasher's rinse aid dispenser, releasing rinse agent at the correct time in the cycle. Replacing a weak or failed unit restores consistent rinse aid dispensing and helps minimize spotting.

  • Actuates the rinse aid dispenser by extending a plunger when energized
  • Works with the control to meter rinse aid during the final rinse
  • Failure symptoms can include rinse aid not dispensing, the level never dropping, and increased spotting/filming on dishes
  • Dispenser may remain closed with no audible actuation during the cycle
What's included: 1 wax motor actuator Installation notes:
  • Disconnect power at the breaker and shut off water before servicing
  • Remove the door panel to access the dispenser; label and disconnect wires
  • Release the old motor and install the new one in the same orientation, ensuring it seats fully
  • Run a test cycle to ensure the dispenser releases rinse aid

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$48.95
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Questions & Answers

For Whirlpool Wax Motor (Dishwasher Rinse Aid Dispenser) (Part Number: OEM18040821)

1 Answer

Hello David! Is the machine draining properly? Check the drain hose for a clog or a kink. If it is not, you may need an impeller kit 12001489. Is the machine draining and then filling overnight? If so, you will need to replace the inlet valve WP99001359. With water being in the tub and the unit adding more water to it when filling this will cause too much water within the dishwasher and cause it to leak even with new gaskets. Hope this helps!

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