How to Test and Replace a Dishwasher Circulation Pump

The cycling pump, or circulation pump, is the part that draws in water and propels it through the wash arms.

The circulation pump is easily identifiable among the other parts of the dishwasher: it has the shape of a snail. The part consists of an engine and a turbine. The device is powered by electricity, it sucks up water and propels it towards the wash arms.

Symptoms of a malfunctioning circulation pump are:

• The total absence of emptying.
• A random evacuation.
• The pump makes an unusual noise during the drain cycle.
• Your dishwasher is leaking.
• A problem occurs when switching on the device.

The circulation pump is inside the dishwasher. It is accessed through the lower panel, below the machine.

The circulation pump in a dishwasher is responsible for pushing water through the spray arms to clean your dishes effectively. If you’re experiencing issues such as poor cleaning performance, noisy operation, or water not circulating properly, the circulation pump may be the culprit. In such cases, it’s important to test the pump to confirm the problem and replace it if necessary. In this article, we will guide you through the process of testing and replacing a dishwasher circulation pump.

1. Safety Precautions

Before beginning any work on your dishwasher, ensure that it is completely disconnected from its power source. This will help prevent any electrical accidents and ensure your safety during the process.

2. Access the Circulation Pump

The circulation pump is typically located at the bottom of the dishwasher, behind the lower access panel or under the tub. Consult your dishwasher’s manual or refer to the manufacturer’s instructions to locate the specific position of the circulation pump.

3. Test the Circulation Pump

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

1. Visual Inspection: Inspect the pump for any visible signs of damage, such as cracks, leaks, or broken parts. If you notice any such signs, it is likely that the pump needs to be replaced.
2. Motor Resistance Test: Disconnect the wires leading to the circulation pump. Set a multimeter to the resistance (ohms) mode and place the probes on the terminals of the pump motor. The multimeter should display a resistance reading within the range specified by the manufacturer. If the reading falls outside this range or shows infinite resistance (open circuit), it indicates a faulty pump motor that needs to be replaced.
3. Impeller Test: Inspect the pump impeller for any blockages or debris that may be hindering its movement. Gently rotate the impeller with your finger to ensure it spins freely. If it feels stuck or difficult to move, it may be necessary to clean or replace the impeller.

4. Replace the Circulation Pump

If you have determined that the circulation pump needs to be replaced, follow these steps:

1. Order the Replacement Part: Obtain a replacement circulation pump 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 Circulation Pump: Remove the lower access panel or any other components that are obstructing access to the circulation pump.
4. Disconnect the Old Pump: Carefully disconnect the wiring connections from the old circulation pump. Take note of the wire placement or take a photo for reference when connecting the new pump.
5. Remove the Old Pump: Depending on the design of your dishwasher, the pump may be attached with screws, clips, or brackets. Remove these fasteners to detach the old circulation pump from the dishwasher.
6. Install the New Pump: Position the new circulation pump 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 circulation pump, ensuring they are secure and properly aligned.
8. Reassemble the Dishwasher: Reassemble any components or panels that were removed to access the circulation pump.
9. Test the New Circulation Pump: Reconnect the dishwasher to its power source and run a test cycle to check the functionality of the new circulation pump. Monitor the dishwasher to ensure proper water circulation and improved cleaning performance.

If you are unsure about replacing the circulation pump yourself or 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 pump.

By following these steps, you can test and replace the circulation pump in your dishwasher, restoring its ability to circulate water and improve 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.