How to Troubleshoot & Replace Ge AP7215773 / WD21X24901C Service Machine Control

Once I found out how to run the test by holding the start and select cycle button for 10 seconds. It displayed the code. Which I then googled to see what it was I found it was the control board. It’s a fairly easy fix. First, turn off the breaker, then remove the front panel, mine was held up by two 1/4” screws. Next removed the wire cover on the right-hand side by a Phillips screw to expose the wires. Unplugged the wire then removed the two screws holding up the panel, popped it down and there was the board. Unclipped a few wires, took out one screw, and removed the plastic clips. Switched it out and hooked everything back up and it worked. Problem solved. 

I cycled the power at the breaker. I checked for power at the junction box and at the connector to the door. I unplugged and re-plugged all of the connectors (power off). I replaced the control board. Finally, I replaced the upper logic board. Dishwasher is working - at least for the moment. 

Ordered a control board and door latch first. Installed them and it was still dead. Then, ordered the user interface board. Installed the UI board and it the dishwasher works fine now. 

Being a retired auto technician I have some knowledge of electronics. I did not know my dishwasher would give a code until I started doing research on it. You can find a lot of info on the web free of charge. If you have any mechanical abilities at all you can diagnose most problems and repair them yourself at a fraction of the cost of calling a repair technician. My unit was giving code 815 which said a door switch or control board. There is a simple test to determine which. I had already tested the door switch before finding the code check procedure and determined it was good and after doing the test the code that said to do it pointed to the control board. I ordered the part from AppliancePartsPros.com Those people are really great and helpful, I had my part the next day had my dishwasher up and running again in less than 20 minutes. The only tools needed were a Phillips #2 screwdriver and a 1/4 inch socket. My G E dishwasher is model # GDT695SMJOES 

I knew the thermal fuse was tripped so the heating element was not working but over time the dishwasher failed to start even after shutting power and cycle on. I decided that the motherboard (control unit) was likely the culprit. It probably went bad allowing the thermal fuse to trip. In the end I decided to change out both the thermal fuse (comes as part of the harness) along with the control board and it works perfectly now! For the record, if your thermal fuse is off, try resetting the fuse (it has a button between the wire leads) and changing out the control board located below the unit. That may be your issue if your unit appears to give you a hard time starting. Good luck. By the way the heater element itself and all other parts were fine and not replaced. 

Replaced main control board located just inside the kick panel. Main power leads go into that and I wasn’t getting power out so that had to be the culprit. Replaced the board with an OEM bird For $100. Solved the problem. Easy fix. Minimal effort. 

Replaced the control board. 

I have one tip that I would share about replacing this control board, and that is: If you have to replace this board, do not remove the complete metal case that houses this board. Only remove the 2 screws on front edge that holds the bottom of the housing case to the top of the case. The only way you will ever be able to plug the short cables back into the new board is if the top case is already in place. You will never get it all back together if you have removed the entire control board case, and then try to put the whole unit back into place. That's where I wasted most of my time trying to replace the faulty board! After I figured that out, the job wasn't too bad, and I am glad to say that our dishwasher is working tip top again!!! 

1) Tried replacing the latch because I understood it to be a common problem. It didn't fix the issue, but I am glad I did it. 2) Replaced the motherboard. This fixed the issue. I could not tip the dishwasher over because of how it's seated under the counter. So, I had to work underneath the dishwasher. It was tough but doable. 

My GE dishwasher would power on, but when attempting to start the cycle, it would beep 3 times and not start. This is a common issue with GE D/Ws. After about 6 months of resetting it by turning off the breaker, that stopped fixing the problem. So I bought the control board after reading about the issue through this sight. The replacement was actually quite simple, I had to remove 2 screws to remove the trim panel, 1 screw for the junction box cover and 2 screws holding the control board tray. I disconnected 4 quick-connect wires and the board came out. Switched it out with the new board and put it back together. Flipped the breaker on and it worked good as new. It took less than 10 minutes.