I bought a used GE dishwasher on craigslist (I use one seldom) and it doesn't drain. My friend who installed it said he doesn't know dishwashers. The model tag is scraped off but is probably a low end model. It's touchpad controls with a dial for start and stop. The overflow is sending excess water down by gravity because it's still at the same level after several cycles.
HELP! How can I troubleshoot the drain without a manual and even a model?