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Customer Questions and Answers for Service Machine Control by Ge

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Manufacturer Part
4.89 (64)
By: Ge
Part Number: OEM21647328
Manufacturer Part Number: WD21X24901C

The Service Machine Control is an OEM component specifically designed for GE dishwashers. As the main control board, it regulates all wash cycles including temperature, filtration, spray arm rotation, drying functions and end of cycle signals.

Causes of a faulty service machine control include normal wear and tear over time. Electronic failures or water exposure from plumbing issues can also trigger malfunctions.

Symptoms of a failing control board are:

  • Inability to progress through cycles fully
  • Flashing error codes during washes
  • Inconsistent wash and rinse performance
  • Component damage from power overload issues

Replacing it with this genuine GE OEM part restores optimal cycle handling. Proper controls are essential for sanitizing every wash. The part is also compatible with Hotpoint, RCA and some Kenmore models.

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Questions & Answers

For Ge Service Machine Control (Part Number: OEM21647328)

1 Answer

Hello Jason, based on your description of the symptoms, likely the wire harness that goes between the boards up through the door is starting to fail it is part WD21X21664.

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1 Answer

Tim, the voltage going from the machine control to the user interface would need to be tested. At the connection J722 of the machine control at the bottom, there should be 13.5VDC from the black/green wire at pin 2 to the yellow/blue wire at pin 5. If there is not, the machine control would need to be replaced. If there is, the user interface would need to be tested. There should be 13.5VDC from the black/green wire at pin 1 to the yellow/blue wire at pin 2. If there is, the user interface has failed. If there is not voltage, the wire harness has failed. The part numbers for each would be dependent on the number in between the J and the SS at the end of the model number and would be necessary for accuracy.

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1 Answer

Scott, if the display does not illuminate, it would be recommended that the main control behind the kickplate is checked as there will be an LED that will indicate an error based on the flash pattern. This error will allow the best identification of the cause of failure.

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1 Answer

Hello Ken, that blink pattern shows that the lower board is powered and working but cannot communicate with the upper board in the door. You can check the wire harness between the two boards with a multimeter for wire breaks, which is the most likely problem, if wire harness tests ok then the problem may be he upper board.

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1 Answer

Ken, Check the light on the main control board under the unit and see how many times it flashes. The amount of times it flashes tells you what is wrong with the unit. The unit beeping would most likely be a faulty keypad.

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Stephen for Model Number GDT655SMJ2ES

our panel on top of the door quit working, no lights, no nothing. I looked at the main control board to see if there was 14 volts, at first I didn't seem to have any voltage, then after checking a few times I got 14 volts and a light on the board lit up and the user panel worked. Don't know if all this took place after I turned the breaker back on or while I was laying on the floor checking for voltage. A few days later unit went dead again, went down flicked breaker several times, lights came on panel. Couple days later went dead, flicked breaker on and off, didn't help, turned breaker back off, several hours later turned the breaker back on unit worked. I need to know which panel to order, the UI or Control Board, or something else? Anything else I should check?

1 Answer

Stephen, From your description the main control needs to be replaced. WD21X24901C Remember when the board sent the voltage to the UI it did function so the main board is failing sometimes not sending the voltage.

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1 Answer

Scott, it would be recommended that the door latch be tested from the machine control WD21X24901C while the power supply to the dishwasher is turned off. At connection J711, there should be continuity from the wire at pin 3 to the wire at pin 4, then from the wire at pin 3 to the wire at pin 5 when the door is closed. If there is not continuity at the machine control but there is directly at the door latch, the failure would be in the wire harness WD21X26122. If there was continuity at the machine control wires, the failure would likely be in the machine control.

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1 Answer

Hello Bill, check the door wire harness (AP6034215) that goes from the mainboard to the control panel, esp in the area where it flexes as the door is opened/closed, the wires in that area are prone to breaking internally.

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1 Answer

Jason, the main control WD21X24901C would need to be inspected to identify if the status LED is illuminated or not. If not, the wire going to the control would likely have a break in it. If the LED is illuminated, the next step would be testing the black/green wire to the yellow/blue wire at connection J722 of the main control for 13.5VDC. If there is voltage, the same wires would need to be tested at the user interface to identify if there may be a wire failure in the DC wire harness WD21X26122.

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Brandon for Model Number GDT655SMJoES

Dishwasher would make random beeps for a month before UI lights went completely out. It would not enter Consumer error mode - display completely out. MC board led consistently on. Confirmed 13.5 volts for IU at MC board pins and again at IU board (after taking IU board out). Replaced IU board with WD21X23462 with appropriate jumper settings. Powered back on. Now door lock controls indicator (orange light on front panel) blinks constantly and washer chimes every few minutes. Other indicator lights that are permanently illuminated include "steam, lower, heated dry." MC led indicator is now flashing 4x over 2.5 seconds, pauses, and then flashes again. Rechecked the connectors, power cycled, checked source voltage and all are good. Any chances we are experiencing a compound failure to include the door lock or MC board? Thoughts appreciated. Thx in advance.

1 Answer

Brandon, based on the information provided, the machine control WD21X24901C is sensing that the door is open when it is flashing 4 times before pausing and repeating the flash pattern. With the power supply turned off, the door latch WD21X10490 can be tested for continuity from the machine control at the connection J711. With one meter probe staying on the tan and red wire at pin 3, the other probe can be placed on the violet and yellow wire, then moved to the white and grey wire to identify if there is continuity. If there is, the machine control has failed. If not, the wires and the door latch would need to be tested individually.

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