The circulation pump and motor in a dishwasher work together to move water around during the cleaning process. Over time, they wear down and stop working as well as they should. When this happens, dishes may not come out clean. Luckily, with the right tools and steps, you can replace these parts yourself.
What Dishwasher Pumps Do
Dishwashers rely on two pumps that each have a specific job. Knowing how they work can help you understand why your dishwasher isn’t cleaning properly.
Circulation Pump
This pump moves water through the spray arms during the wash and rinse cycles. It pulls water from the bottom of the tub and sends it out with enough pressure to clean the dishes. The circulation pump operates during most of the cycle, shutting off only when the water drains.
Drain Pump
The drain pump removes water from the tub. It works briefly at the start of a cycle to clear out leftover water and again at the end of the wash and rinse phases to empty the tub. Unlike the circulation pump, it runs only at specific times.
Signs You Should Replace the Circulation Pump and Motor
If your dishwasher shows these problems, the circulation pump or motor may need replacement:
- Dirty dishes: Water isn’t moving well enough to clean them.
- Longer cycles: The motor might be struggling to keep up.
- Water pooling: Standing water at the bottom after a cycle suggests poor flow.
- Leaks: Worn seals in the pump or motor can cause water to leak out.
Tools for the Job
- Phillips screwdriver
- 5/8-inch open-end wrench
- 5/16-inch nut driver
- Flathead screwdrivers (small and medium sizes)
- Replacement circulation pump and motor (e.g., W11612326)
How to Replace a Dishwasher Circulation Pump and Motor
Below are the steps to replace a dishwasher circulation pump and motor to help restore its performance and functionality.
Disconnect the Water Supply and Drain Lines
- Locate the shut-off valve along the water supply line under the sink.
- Use a 5/8-inch wrench to loosen the fittings, then remove them by hand.
- Trace the drain hose to its end connector, typically an air gap.
- Use a 5/16 nut driver to release the hose clamps and detach the drain line.
Remove the Dishwasher from the Cabinet
- Open the dishwasher door and pull out the lower dish rack.
- Use a Phillips screwdriver to remove the screws along the top of the dishwasher frame.
- Lift the door slightly and slide the dishwasher carefully out of the cabinet using its frame for leverage.
- Place a protective cloth beneath the dishwasher to protect the floor during the next steps.
Access the Pump and Motor Assembly
- Lay the dishwasher on its back to access the underside.
- Locate the pump assembly inside the bottom interior of the dishwasher.
- Use a small flathead screwdriver to release the wiring harness clip and disconnect the wiring.
- Bend the non-reusable clamp on the inlet hose with a screwdriver to release its locking tab.
- Gently pull down on the pump assembly to detach its mounting tab from the housing base.
Install the Replacement Pump and Motor
- Compare the new pump and motor assembly with the old one for compatibility.
- Wet the rubber gaskets on the new pump and sump housing for easier insertion.
- Align the locking tabs and press the new pump fully into place.
- Secure the inlet hose using a reusable screw clamp.
- Reconnect the wiring harness to the new pump assembly.
Refit the Dishwasher and Reconnect the Lines
- Lift the dishwasher back into an upright position.
- Slide the dishwasher into the cabinet opening while guiding the water supply and drain lines through the exterior openings.
- Push the dishwasher fully into place and position all hoses correctly.
- Tighten all hose fittings securely.
- Use a Phillips screwdriver to reattach the mounting screws, fastening the dishwasher frame to the countertop.
Test Operation and Complete the Repair
- Reconnect the power and water supply.
- Select a normal cycle and run the dishwasher to test the new pump.
- Confirm that dishes are cleaned properly and verify there are no drainage issues.
- Run multiple cycles to confirm the proper function and reliability of the repair.
Common Mistakes to Avoid During Repairs
When replacing the pump and motor, keep these points in mind to avoid problems:
- Forgetting to unplug the dishwasher can lead to electrical shocks.
- Skipping the water shutoff might result in leaks or flooding.
- Using the wrong tools can damage parts and make the job harder.
- Installing the new pump incorrectly can cause leaks or poor performance.
Tips for Choosing a Replacement Pump and Motor
Picking the right replacement part is important. Here’s how to make the right choice:
- Check your model number: Look in the dishwasher manual or on the appliance to find the correct part number.
- Choose quality parts: Purchase from a trusted supplier to avoid unreliable components.
- Compare prices: Look for a balance between cost and durability.
- Ask for advice: Reach out to a repair specialist or customer service if you’re unsure about the right part.
Closing Thoughts
A broken pump doesn’t have to mean giving up on your dishwasher. Following these steps can help you tackle the problem head-on and get your dishes clean again. Each part of the process is straightforward, and avoiding common mistakes is easier when you stick to the plan. Take control of the repair and see how quickly your machine can get back to work.