How to Test and Change the Resistance of a Dishwasher

Jul 18, 2023, 18:54pm

The resistor is the heating element of a dishwasher. It allows you to reach the desired water temperature to optimize dishwashing.

On some models, it is in direct contact with the water at the bottom of the tank. On others, it is surrounded by a tube. It is important that the resistance remains in contact with water, otherwise it could be damaged.

This part wears out quite easily, mostly due to limescale. In this case, the following failures may occur:

  • The water does not heat up anymore or not enough.
  • The water is too hot and the temperature does not correspond at all to that desired.

Temperature-related problems are often caused by a faulty resistor.

The resistance is located on the bottom of the device. Indeed, it heats the water at the bottom of the tank.

The resistance in a dishwasher, also known as the heating element, is responsible for heating the water during the wash cycle. If you notice that your dishwasher is not heating properly or if it’s not getting your dishes clean, it may be necessary to test and potentially change the resistance. In this article, we will guide you through the process of testing and changing the resistance of a dishwasher.

How to Test and Change the Resistance of a Dishwasher

Testing the Resistance

Before replacing the resistance, it’s important to determine whether it is indeed the cause of the problem. Follow these steps to test the resistance:

  1. Safety Precautions: Ensure that the dishwasher is unplugged or disconnected from its power source to avoid any electrical accidents.
  2. Access the Resistance: Locate the resistance in your dishwasher. It is typically located at the bottom of the dishwasher, underneath the tub.
  3. Disconnect the Resistance: Carefully disconnect the wiring connections leading to the resistance. Take note of the wire placement or take a photo for reference when reconnecting.
  4. Use a Multimeter: Set your multimeter to the resistance testing mode (ohms). Touch the multimeter probes to the terminals of the resistance. The multimeter should display a resistance value within the range specified by the manufacturer.
  5. Compare the Reading: Consult your dishwasher’s manual or contact the manufacturer to obtain the specific resistance range for your model. If the resistance reading on the multimeter falls outside this range or shows infinite resistance (open circuit), it indicates a faulty resistance that needs to be replaced.

Changing the Resistance

If you have determined that the resistance is faulty and needs to be replaced, follow these steps to change it:

  1. Order the Replacement Part: Obtain a replacement resistance that is compatible with your dishwasher’s make and model. You can typically find this part at an appliance repair store or order it online.
  2. Disconnect the Dishwasher: Ensure the dishwasher is completely disconnected from its power source.
  3. Access the Resistance: Remove the bottom panel of the dishwasher or access the resistance from inside the dishwasher, depending on the design of your appliance.
  4. Disconnect the Old Resistance: Carefully disconnect the wiring connections from the old resistance. Take note of the wire placement or take a photo for reference when connecting the new resistance.
  5. Remove the Old Resistance: Depending on the design of your dishwasher, the resistance may be attached with screws, clips, or brackets. Remove these fasteners to detach the old resistance from the dishwasher.
  6. Install the New Resistance: Position the new resistance in place, aligning it with the mounting holes or brackets. Secure it using the appropriate screws, clips, or brackets as per the manufacturer’s instructions.
  7. Reconnect the Wiring: Connect the wires to the corresponding terminals on the new resistance, ensuring they are secure and properly aligned.
  8. Test the New Resistance: Reconnect the dishwasher to its power source and run a test cycle to check the functionality of the new resistance. Monitor the dishwasher to ensure the water is heating properly.

How to Test and Change the Resistance of a Dishwasher

If you are unsure about replacing the resistance yourself or if you encounter any difficulties during the process, it is recommended to consult a professional appliance technician. They have the expertise and tools necessary to safely and effectively replace the resistance.

By following these steps, you can test and replace the resistance of your dishwasher, restoring its ability to heat water and improve the cleaning performance. Remember to prioritize safety throughout the process by disconnecting the dishwasher from its power source and taking necessary precautions to avoid electrical accidents.