Okay everyone, I will try to be as brief as I can while explaining all of the steps I have already taken. I received a call about a Samsung front load washer which would not drain and was receiving an nd code as well. Went there and did a quick test on all of the functions and everything worked perfectly fine except for the drain pump test. When I tested the pump all it did was hum. So I tore the washer apart and accessed the pump in order to clean it out. Was able to remove some lint and hair, but nothing too major. Tested the pump outside of the machine isolated by itself and it spun great and worked as expected. Hooked everything back up and installed all components of the washer and tested it again. Drain pump still worked and actually pumped out one load of water. Problem solved, right? Left customers house and got a call later about it popping up an nd code again and not draining.
Went back the next day and ran the quick test again. Pump was only humming, but if you reached in the filter housing with a long screwdriver you could flick one of the impellers and the pump would start running. So then I thought that the windings were bad on the pump so I purchased a new pump. Get it all hooked up and it basically does the same exact thing. It worked isolated from the machine and pumped water out on the very first try. But now all it is doing is humming and will start to run if it is manually started with a screwdriver.
****Also, if you manually start the pumps with a screwdriver, both of them will continue to run until water is added into the machine. As soon as you add any amount of water into the washing machine, the pumps act like they are "seized" up and will start to hum.
My question is am I missing something else to check? Something with the control board? Would there be something that is frying these motors? Would water level have anything to do with it? I'm stumped......any help would be greatly appreciated, have already put way too much time into this thing.