How to Test and Replace a Dishwasher Solenoid Valve

Jul 19, 2023, 14:40pm

The aquastop solenoid valve is used to manage the water inlet to the dishwasher. It also serves as a safety device against water leaks and prevents overflow that may occur during operation. When a leak is detected, the electronic board sends a command to cut off the water supply.

The most common solenoid valve failure is a fill level problem. This part will have to be changed if you notice that the dishwasher does not fill enough, or not at all.

The aquastop is recognizable by a white / transparent pipe that comes from your pipe.

The solenoid valve in a dishwasher controls the flow of water into the machine during different cycles. If you’re experiencing issues with the water supply, such as no water entering the dishwasher or continuous water flow, the solenoid valve may be faulty and in need of testing and replacement. In this article, we will guide you through the process of testing and replacing a dishwasher solenoid valve.

How to Test and Replace a Dishwasher Solenoid Valve

1. Safety Precautions

Before you begin testing or replacing the solenoid valve, ensure that the dishwasher is completely disconnected from its power source and the water supply. This will prevent any electrical accidents and ensure your safety during the procedure.

2. Locate the Solenoid Valve

The solenoid valve is typically located at the bottom of the dishwasher, near the water inlet hose connection. It may be accessible from the front or the rear of the dishwasher, depending on the model. Refer to your dishwasher’s manual or consult the manufacturer’s instructions to locate the specific position of the solenoid valve.

3. Test the Solenoid Valve

To test the solenoid valve, follow these steps:

  1. Disconnect the Water Supply: Turn off the water supply to the dishwasher by shutting off the water valve connected to the dishwasher’s inlet hose.
  2. Access the Solenoid Valve: Remove the bottom access panel of the dishwasher, if necessary, to access the solenoid valve.
  3. Identify the Solenoid Valve: Locate the solenoid valve, which is a cylindrical component with electrical wires connected to it.
  4. Disconnect the Electrical Wires: Gently disconnect the electrical wires connected to the solenoid valve. Take note of their positions for reassembly.
  5. Set Multimeter to Ohms: Set a digital multimeter to the “Ohms” (Ω) or resistance measurement setting.
  6. Test the Solenoid Valve Coil: Place the multimeter probes on the terminals of the solenoid valve coil. A properly functioning solenoid valve should show a specific resistance reading within the range specified by the manufacturer. If the reading is significantly different or shows no continuity, it indicates a faulty solenoid valve that needs replacement.
  7. Test the Solenoid Valve Operation: With the multimeter still connected, have an assistant turn on the dishwasher or initiate a water cycle. You should hear a click sound, indicating that the solenoid valve is energizing and allowing water to flow. If there is no click or water flow, it confirms a malfunctioning solenoid valve.
  8. Disconnect the Multimeter: Once the testing is complete, disconnect the multimeter probes from the solenoid valve terminals.

4. Replace the Solenoid Valve

If the solenoid valve fails the test or if you suspect it is not functioning properly, follow these steps to replace the component:

  1. Disconnect the Water Supply: Turn off the water supply and disconnect the water inlet hose from the solenoid valve.
  2. Remove Mounting Screws or Clips: Use a screwdriver or pliers to remove any mounting screws or clips securing the solenoid valve in place.
  3. Disconnect the Water Lines: Carefully disconnect the water lines attached to the solenoid valve. Be prepared for some water to spill out, so have a towel or bucket ready to catch any excess water.
  4. Take Out the Old Solenoid Valve: Gently lift out the old solenoid valve from its position, ensuring that you do not damage any surrounding parts.
  5. Install the New Solenoid Valve: Place the new solenoid valve in the same position as the old one, aligning it with the mounting holes or clips.
  6. Reconnect the Water Lines: Attach the water lines to the corresponding ports on the new solenoid valve, ensuring a secure connection. Use clamps or hose connectors to fasten the lines to the valve.
  7. Secure the Solenoid Valve: Use the appropriate mounting screws or clips to secure the new solenoid valve in place. Ensure it is tightly fastened but be careful not to overtighten.
  8. Reconnect the Water Supply: Reconnect the water inlet hose to the new solenoid valve and turn on the water supply.
  9. Reconnect the Electrical Wires: Reconnect the electrical wires to the corresponding terminals on the new solenoid valve.

5. Reassemble the Dishwasher

Once you have successfully replaced the solenoid valve, it’s time to reassemble the dishwasher:

  1. Replace the Bottom Access Panel: If you removed the bottom access panel, carefully position it back in place and secure it with the screws.
  2. Restore Power Supply and Water: Reconnect the power supply and turn on the water supply.

How to Test and Replace a Dishwasher Solenoid Valve

6. Test the New Solenoid Valve

With the new solenoid valve installed, it’s important to test its functionality:

  1. Run a Test Cycle: Start a dishwasher cycle and closely monitor the water flow. Ensure that the new solenoid valve allows water to enter the dishwasher and shuts off appropriately during the cycle.
  2. Check for Leaks: During the test cycle, inspect the connections of the new solenoid valve for any signs of water leakage. If you notice any leaks, turn off the dishwasher and recheck the connections to ensure they are secure.

By following these steps, you can successfully test and replace a faulty solenoid valve in your dishwasher, ensuring proper water flow during the dishwasher cycles. Remember to consult your dishwasher’s manual or refer to the manufacturer’s instructions for any specific guidelines or recommendations. If you are unsure about testing or replacing the solenoid valve yourself or encounter any difficulties during the process, it is recommended to seek the assistance of a professional appliance technician. They have the expertise and tools necessary to safely and effectively test and replace the solenoid valve.