Warning: this is a job best left to a professional. The combination of sharp edges (I swear that Gillette makes the bodies for every washer and dryer of every make) exposure to electrical shock and potential property damage from water will more than make up for the service call a professional will charge you, not to mention destroying electronic parts of your machine. If you decide to tackle this yourself, you do so at your own risk. This is for informational purposes only .
Despite what you've heard on the news, Samsung makes a great washer that's pretty reliable. Their front loading washers have few real issues, and though this one is confounding, it's a fairly straightforward fix. Let's say you have a Samsung front washer that drains intermittently. It will pump out water vigorously for the first second or two, then the pump stops (which it's supposed to do) and then starts again with nary a trickle of water. So you open the manual and clean out the filter, and probably remove a years worth of spare change, barrettes, a shoelace and try again.
The washer starts and drains, but then stops again. You consider replacing the pump and if you do, find that the washer does the exact thing it did before. You curse the ground that Samsung walks on and consider the price of replacing the machine. Rather than making a rash decision, try this fix first.
You will need a wet dry vacuum, a lot of towels, a pan, a five bucket or a combination of same. You will need to remove as much water from the machine as you can. You can use the drain tube to remove most of it, but you will want to use your wet dry vacuum to suck the water out of the business end of the drain hose too. Make sure you UNPLUG the machine before doing ANY work on it and remove as MUCH water as you possibly can. You can crack open the cleanout valve with the end of your vacuum pointed toward same to lap up the water. Again, the water in the drain hose MUST be removed as you will be reaching inside the machine to remove it from the pump housing.
Remove the back of the machine; there are two screws and that panel lifts up and out. You will want to wear long sleeves and gloves for the rest of this fix to prevent cuts and scrapes. You will also want something to hold the spring clamp as you put it back on unless you have Chuck Norris hands. Follow the drain hose to the pump housing, grab the clamp with your fingers and pull the hose off the pump housing. There is a rubber flapper valve inside the stub you just pulled the hose off. Remove this flapper and discard it; then reinstall the hose and make sure the camp is secure on same or you WILL be making an insurance claim. Admittedly, reinstalling that clamp is going to be a P.I.T.A. unless you remove the top and front of the washer, but it can be done,
Once the clamp is on, take a bucket and dump some water into the machine and make sure the connection is water tight. If you took the time to remove the top and front of the machine, it will be easier to do both, but it will take a few more minutes to remove and reinstall. The problem with these machines is that that valve will get sucked back into the stub and jam inside, restricting the flow of water. The side effect is that water may see saw a bit back and forth, but it will be negligible compared to spending hours trying to drain your washer. Maranatha!