5 Reasons Why Dishwasher Soap Not Dissolving

The dishwasher is one of the most useful appliances to have at home.

It does much of the cleaning after meals, especially after parties, with little manual assistance.

All you have to do is load the dishes, put in the detergent, turn on the tap, and start the motor running.

You’ll have clean dishes in a flash.

Some dishwashers even dry the dishes for you.

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But after some time your dishwasher shows signs that it isn’t operating perfectly.

You observe soap residues here and there and you ask,

Why is the dishwasher soap not dissolving completely? What could be the problem?

How does the dishwasher get the job done?

To understand the problem, you need to know a little bit about how your dishwasher gets the job done.

The easy part is that your dishwasher gets the job done in the same way that you do — using soap and water, and a little scrubbing.

But the dishwasher does it like a robot.

You press buttons and flip switches telling the dishwasher how you want your dishes done; if it has a drier, if you want it to also dry the dishes after rinsing.

The scrubbing part of the dishwasher is done through high pressure water jets squirting from the tiny holes in the washer’s arms.

Imagine the water jets like when you stop water running out of the open end of a hose with your thumb.

The dishwasher arms rotate around the dish rack (above, between, or below) to make sure that all the dishes are ‘scrubbed’ with soapy water.

When the dishwasher is in operation, several things happen:

1) Water is let in and heated to temperatures of 120-160ºF.

Hot water not only removes food particles from the dishes easier, it helps to dissolve the detergent powder or tablet in the basin.

2) The tiny dispenser door opens and the soap powder or tablet is released.

This drops into the hot water in the basin and dissolves.

3) Soapy water is sucked down the drain holes at the bottom, then pumped up into the rotating arms and shot out like water jets.

4) After the wash cycle, the dishwasher drains all the soapy water.

Then the rinse cycles begin until the dishes are done and, in some cases, dried.

So, we come back to the question, Why is the dishwasher soap not dissolving completely?

What could be the problem?

Here are some possible causes:

1) Inlet valve malfunction

When your dishwasher not getting water, obviously dishwasher detergent will not dissolve at all and you will see soap in the bottom of your dishwasher when you open the door.

If you not sure if your dishwasher getting water, just open the dishwasher door SLOWLY in 2 minutes after you press START button, to make sure you have water at the bottom of your dishwasher.

If there is no water, then most likely inlet valve failed and need replacement.

2) Water not hot enough

One of the causes, why your dishwasher tablet is not dissolving, is that the water is not hot enough.

The normal water temperature for dishwasher tablets to dissolve is 120-160ºF.

If your dishwasher is not equipped with a thermostat or temperature monitors, then you need to check the temperature of the water manually using a thermometer.

This way you can tell if the water isn’t getting hot enough to dissolve the tablet.

3) Dispenser door blocked or jammed

Another cause why your dishwasher tablets are not dissolving fully is when the dispenser door does not completely open.

The dispenser door needs to open completely for the soap tablet to drop into the hot water.

If the dishwasher tablet is not releasing properly the dispenser door might be blocked.

This can happen if your dish rack is not stacked properly and an object (e.g. a tray or a cooking panhandle) is preventing the door from opening.

Always make sure to stack large, long or tall items far from the dispenser door to prevent from blocking it.

4) Circulation pump failure (one of the common problems)

Another cause why your dishwasher tablets are not dissolving in your Bosch, Maytag or any other dishwasher is because the circulation pump being seized or jammed by something.

When the circulation pump works ok, it spraying water in the dishwasher and when dispenser door will open, water will wash out all detergent from the dispenser.

If you will hear strange unusual noise coming from the dishwasher right after when it is filled with water, open the dishwasher door to see if any water splashing out.

If nothing, just a small amount of water, then definitely something wrong with the circulation pump.

5) Spray arm clogged

Take a look at the spray arm holes, they need to be clean and not being clogged with some food particles.

Otherwise, water will not be spraying out and dishwasher soap will not dissolve

Or it could also mean that you put too much soap for a very light load and the wash cycle was too short to dissolve all the powder or tablet.

Always follow the manufacturer’s recommendations.

6) Spray arm broken and not able to spin

It is good to know why the dishwasher soap is not dissolving completely in your dishwasher, before calling for professional help.

Knowing how your appliance works helps you troubleshoot some problems you may encounter in its regular use.

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18 thoughts on “5 Reasons Why Dishwasher Soap Not Dissolving”

    • Hi Harvey, you can increase temp on your water heater tank, not on the dishwasher. Please consult plumber

  1. Hi
    My whirlpool dishwasher isn’t dropping the detergent cube out into the tub. When I remember to throw it in the tub manually it works fine. Are all detergent doors supposed to be spring loaded? It doesn’t appear mine is or was and I never took notice until the detergent pod stopped falling out. Thank you for any insight.

    • Hi Chris, you need to check wax motor for continuity, to make sure its not burnt out. That motor opens a soap dispenser door.

  2. My soap dispenser door is springing open but now and then recently the detergent cube does not eject from the dispenser, it is still there when the wash is finished

    • Hi there, you need to check dispenser door solenoid to make sure its not burnt out. This is most common issue when dispenser door NOT OPENING AT ALL. If sometimes it works ok and sometimes not, then something interferes with the door (plate, fork, etc)

      • I have a samsung dishwasher that recently stop dissolving tablets. After a wash the tablet remains stuck in the dispenser intacted but the spring door opens just fine. Using liquid detergent doesnt seem to dissolve either. It just runs down the door.

        • Don’t know honestly what it could be. Maybe just wash dispenser to make sure tablets will not stick? Also, try to put tablet in a dispenser and not close dispenser door, then close the dishwasher door. Then open the dishwasher door again. Tablet fall down from dispenser? if not, then something keeps the tablet in there

    • No, because soap only released when its needed. You don’t need to dissolve soap during the presoak cycle at the very beginning.

  3. We have a whirlpool dishwasher and the door opens for the soap but it is not dissolving and when the cycle is up it’s just laying in the bottom of the dishwasher and nothing is clean, everything is wet.

    • Seems like you have failed wash pump.. Try to start cycle, it should fill with water and after 30sec as it filled with water, open the door. If you don’t see water is splashing, you have failed wash pump


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