You'll need to unplug your washer and pull it out from the wall, then remove the back access panel and remove the rubber hoses to it, becareful water may come gushing out, see if you can get a pan or pot to catch the water in.
Then remove the drain pump and check for something inside clogging it.
I am having an "ND" code issue with my Maytag Neptune MAH6700AWW, as well.
I have done everything as described above. I also found a penny. Made sure that the drain hose is clear and then put everything back together. The first test load, consisting of the towels that I used to clean up my mess from my initial investigation, I got the same error. I can hear the pump running, but still getting the error.
Once again, took the hoses off and removed the pump.
Removed the pump from the housing. Nothing apparently wrong with the impeller. There is about 1/8" of play between the impeller and the pump housing, which a call to a local appliance shop verified is normal. Hooked it up to the leads inside the washer and tested it with 'spin only' selected. The pump appears to be running normally.
Removed the black boot on the bottom of the washer, which attaches to the "IN" side of the pump. No obstruction found.
So, any ideas? There are no apparent obstructions and the pump appears to be functioning normally. Still getting the "ND" error code.
I have a Maytag MAH6700AWW and I'm having problem with the pump, I opened the hoses and they were fine, so I removed the pump to check and I found that the impeller is ruined. Can I buy only the impeller? The motor is working fine.