Why Won't My Dishwasher Tablet Dissolve?

Jul 19, 2023, 15:53pm

There are several methods for washing your dishes: classic products that just add to the detergent drawer or tablets.

If the tablet is “all-in-one”, then there is no need to add rinse aid and salt. However, the tablet may not dissolve well in your dishwasher. We are going to show you step by step the checks to be carried out to discover the origin of this problem.

Using dishwasher tablets is a convenient and effective way to clean your dishes. However, if you’ve noticed that your dishwasher tablet is not dissolving properly during the wash cycle, it can be frustrating and may result in poorly cleaned dishes. There are several common reasons why dishwasher tablets may not dissolve, and understanding these factors is crucial for addressing the issue. In this article, we will explore some of the most common causes of dishwasher tablet non-dissolving and provide guidance on how to resolve them.

Why Won't My Dishwasher Tablet Dissolve?

1. Tablet Placement

The placement of the dishwasher tablet within the dishwasher can affect its dissolution. Here’s what you can do:

  1. Check the Dispenser: Ensure that the dishwasher tablet is placed in the designated dispenser compartment or tray. Refer to your dishwasher’s manual to locate the dispenser.
  2. Properly Load Dishes: Avoid placing dishes or cookware in a way that obstructs the dispenser or tablet. Ensure that items are arranged properly to allow the tablet to come into direct contact with water during the wash cycle.

2. Water Temperature

Dishwasher tablets are designed to dissolve effectively at specific water temperatures. If the water temperature is too low, it may not be sufficient to dissolve the tablet completely. Consider the following steps:

  1. Verify Water Temperature: Check the hot water temperature at your kitchen sink using a thermometer. It should be around 120-140°F (49-60°C) for optimal dishwasher performance. If the water temperature is too low, adjust your water heater accordingly.
  2. Run Hot Water Before Starting: Run the hot water in your sink for a few minutes before starting the dishwasher. This will help ensure that hot water is readily available and improves the tablet’s dissolution.

3. Spray Arm Blockage

A blocked or clogged spray arm can prevent proper water circulation and hinder tablet dissolution. Here’s what you can do:

  1. Remove and Clean Spray Arms: Remove the dishwasher’s spray arms and inspect them for any blockages, such as food particles or mineral deposits. Clean the spray arms thoroughly using a soft brush or toothbrush, ensuring that the nozzles are clear of any debris.
  2. Clear Spray Arm Holes: Use a toothpick or a thin wire to clear any blockages in the spray arm holes. This will allow water to flow freely and aid in tablet dissolution.

4. Insufficient Water Pressure

Insufficient water pressure can also impact the tablet’s ability to dissolve properly. Consider the following steps:

  1. Check Water Supply: Ensure that the water supply valve to the dishwasher is fully open and providing adequate water pressure. If you suspect low water pressure, contact a plumber to address the issue.
  2. Clear Clogged Filters: Dishwashers are equipped with filters that can become clogged over time. Check and clean the filters regularly to maintain proper water flow and pressure.

5. Hard Water Deposits

Hard water can leave mineral deposits on dishwasher components, including the tablet dispenser, which can affect the tablet’s dissolution. Consider the following steps:

  1. Clean the Dispenser: Remove any mineral deposits or residue from the dispenser using a soft brush or toothbrush. You can also use a mild vinegar solution to dissolve mineral buildup.
  2. Use a Water Softener: Consider using a water softener or dishwasher cleaner designed to combat hard water deposits. These products can help improve dishwasher performance and tablet dissolution.

6. Old or Expired Tablets

Using old or expired dishwasher tablets can result in poor dissolution. Ensure that you are using fresh, high-quality tablets that are within their recommended expiration date.

Why Won't My Dishwasher Tablet Dissolve?


To check if your dishwasher is heating correctly, just run a program, wait 20 minutes and then open the door to see if steam is escaping from the dishwasher.

You can also test the heating resistor located under the dishwasher. Using your multimeter set to 600 ohms, place the terminals on the terminals of the resistor, if a value is displayed it means that it is functional. Otherwise, the resistor will need to be changed.

In conclusion, several factors can contribute to dishwasher tablet non-dissolving, including improper tablet placement, low water temperature, spray arm blockages, insufficient water pressure, hard water deposits, and using old or expired tablets. By following the troubleshooting steps outlined in this article, you can identify and address many of these issues. However, if the problem persists or you are uncertain about performing any repairs yourself, it is best to consult a professional technician or contact the dishwasher manufacturer for further assistance. They will be able to diagnose the underlying cause and provide appropriate guidance to ensure your dishwasher tablets dissolve effectively, resulting in sparkling clean dishes.