There’s nothing more frustrating than a malfunctioning dishwasher; the time and effort it takes to install the dang things makes you almost think it’s worth it to wash your dishes by hand in order to avoid the process, and then you end up just having to do both if the washer won’t work. The most important part of getting to the point that you can fix your machine is the proper diagnosis of the problem; here’s some advice for what you can look for in order to figure out what went wrong with your appliance and what can be done to get it functioning again so it’s washing the dishes instead of you.
Open the door and peak inside your dish washer. Does it look like the dishes have become overloaded? By putting too many dishes in the rack for each load, you can sometimes cause your dishwasher to leak. If you are indeed experiencing an unexplained leak, take some of the dishes out and see if the problem persists.
Another option if leaking is your problem; you may have a faulty door seal that is allowing water out of its cracks and holes. Check the plastic seal of any ruptures or discontinuities and if you find some, know that this is one of the cheapest and easiest problems to fix. You can just get some calk from the local hardware store and set it yourself to try to fix this one.
If neither of these sounds like your problem, you may want to have a look at your detergent tray. If there’s soap residue left over, you’re probably putting in too much soap per load, causing your machine to leak. It sounds unlikely, but this has actually happened to me, and the worst thing in the world is to completely replace your dishwasher only to realize that your problem (a sudsy leakage towards the end of the cycle) returns with a vengeance.
Finally, you’ll want to examine the pipe connections in the back of your machine to see if they’re in proper condition. Give them each a soft twist to see if they’re loose; they shouldn’t give, but if they do, you’re going to want to tighten that pipe. If you’re in luck, that’ll fix your leakage problem.
Now say you don’t really have a leakage problem and it’s more of an issue involving the dishes coming out unclean. If they’re dry and dirty, your dishwasher isn’t filling with soap and water the way it’s supposed to.
This can be an issue caused by a closed hot water valve (which you can check under your sink to verify). Another option is that your inlet valve may be clogged. If it’s plugged by debris and residue, all you have to is clean it out to get everything up and functioning again.
Now say your issue is that there’s always a bit of water at the bottom of your dishwasher when you open it after a cycle; this is actually very normal, but if it’s an excessive amount then yes, maybe your dishwasher’s drain hose is malfunctioning.