Samsung Dishwasher Not Cleaning

Samsung Dishwasher Not Cleaning

Bill Gilbert and 1 contributor
Last updated on

We need to make sure that you are here because your dishwasher runs but is not cleaning properly, rather than your dishwasher is not starting. If your dishwasher doesn't start, go to this page.

Usually, one of two problems will cause poor cleaning performance:

  1. The dishwasher is being improperly used, or
  2. The dishwasher is malfunctioning in some way.

We will concentrate on proper use and care in the following list and then go into possible malfunctions or other causes in the following sections. The primary source of these care and use recommendations is Samsung.

Don't Pre-Rinse

Who are these fools, you may ask? WAIT! Before you write this off, note that this is the recommendation of both dishwasher manufacturers and dishwasher detergent manufacturers.

  • By all means, scrape off the big chunks (noodles, etc.), but don't try to get the dishes spotless. Dishwasher detergent is designed to work with dirty dishes.
  • Further, many units have a soil detector (turbidity sensor) which may be fooled into thinking your dishes are cleaner than they are and stop the cycle early. Speaking of cycles…

Use the Right Cycle

  • While many of us see picking our cycle as a superior option, the Auto cycle found on many units can do an excellent job while minimizing water and energy use. You should experiment before just dismissing it as a gadget.
  • Also, don't be afraid to use the Heavy Cycle for nasty stuff like casserole pans and pots.

Load the Dishwasher Properly

You may think it is self-evident how to load a dishwasher, but the designers set it up to be loaded a certain way.

  • That's what your owner's manual is for. It will describe how to load the machine.
  • It may not consider every odd load you may need to wash, but it will frequently have recommendations from people with a vested interest in your dishwasher performing well.
  • Try to load large items to the outside to avoid blocking the spray in the middle of the dishwasher. Face the dirty part of the item to the inside. Make sure pots are loaded with the opening downward so the spray can reach the inside.

Use Rinse Aid

Since many dishwashers use unheated drying cycles, they depend on water shedding from the dishes as part of the drying operation. They rely on rinse aid to "aid" with this (lots to do with rinse, you might wonder).

  • If you are concerned that your dishes have a chemical residue from the rinse aid, some alternatives rely on natural ingredients. You can also make it yourself.
  • Some dishwashers will show a warning light, and others will not take advantage of some cycles if they detect that the rinse aid dispenser is empty.

The temptation to go heavy with the detergent when the dishes are really dirty is strong. Excess detergent often deposits on the dishes, resulting in filmy or foggy dishes.

  • Brand changes are a first resort, in preference to pouring in more detergent when things aren't cleaning well.
  • Keep in mind that dishwasher detergent, because it does not have to be as gentle as hand dish detergent, is considerably more powerful, and a little goes a long way, especially with water that has the right…(water temperature in case you couldn't guess)

Water Temperature

This is quite important, but it takes a little effort to check. Many detergent pods or pacs may not dissolve entirely if the temperature is below 130°F, adversely affecting cleaning.

  • The easiest way is to adjust your water heater until the water at your kitchen faucet near the dishwasher registers 120 to 149°F (49 to 65°C); a digital meat thermometer is excellent for checking this.
  • Many dishwasher instructions will also recommend that before you run a cycle, you run the water at the faucet closest to your dishwasher until it is hot so the dishwasher doesn't have to try to heat the water.

Run A Cleaning Cycle

You can run a cycle (with no dishes and NO detergent) using a dishwasher cleaning product, white vinegar, or citric acid powder. Here is a link to more information from Samsung on cleaning your unit.

Now, we look at the malfunctions that may be taking place. Since the dishwasher runs, the issues will likely be related to getting water on the dishes.

Causes

1

If the water can't get to the dishes effectively, it will not clean them.

Spray Arms Clogged

  • Check each spray arm in your machine for debris stuck in the holes. This is especially important for the holes near the ends that provide the thrust to spin the arm.

 If they get clogged, the arm will not spin as effectively. If the arm is clogged, remove it and clean out the debris. If the arms are clear, go to the next step.

Spray Arms Jammed

  • Ensure each spray arm turns freely without rubbing on the interior parts of the dishwasher, and check for proper installation. Check the bearing surfaces for wear. Go to the next item if everything looks okay.
2

Mineral or detergent buildup can cause this. Occasionally, a wiring harness in the door of the unit will fail and cause the dispenser not to open.

  • Check to see that your detergent dispenser is opening correctly.
  • Avoid overfilling the dispenser.
  • Clean the dispenser with a cloth soaked in vinegar. Look especially for buildup that might jam the dispenser and keep it from opening.
  • You can run a cycle with nothing in the dishwasher and put your regular detergent in the dispenser and see if it opens.
  • If the dispenser checks out, go to the next item.
3

Most Samsung dishwashers have a circulation pump and a drain pump. In this case, the circulation pump may be failing or jammed.

  • Check the circulation pump impeller for a clog and the ducts under the filter screen supplying the spray arms.
  • Also, check and clean the filters that supply the pump.
  • You may need to pull the dishwasher out from under the counter to access the pump on some models.
4

Your dishwasher may have a distributor valve that regulates where the wash water goes. If the motor that drives the valve fails, you will often get cleaning in only one part of the dishwasher. You may also get an error code as well.

If you notice that dishes in one part of the unit are cleaned while dishes in another aren't, and the spray arms for each area are clear, the distributor motor is a likely issue and you'll want to replace it. If the problem seems to be affecting all the dishes, this is probably not the problem.

5

On Samsung "Waterwall" models, a motor operates the lower wash vane and moves it alternately from the front to the rear of the dishwasher. If the motor fails, the lower rack dishes will not be cleaned adequately. If this checks okay, go to the next item.

6

If the check valve on the dishwasher outlet hose fails, dirty water from a previous pump out can get back into the water and redeposit old soil. If it is okay, go to the next item.

7

If the turbidity sensor on your dishwasher fails, the unit may think the dishes are clean when they are not. Since this is unusual, make sure to check all other causes first. The turbidity sensor is located in the sump of your dishwasher and can only be reached by pulling the dishwasher out from under the counter. You can check it with a multimeter when removed from the appliance, but all you will be able to determine is if it is open or shorted; you won't be able to test its function.

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