A dishwasher that refuses to drain is a frustrating problem. You open the door expecting sparkling dishes but are met with a pool of murky, stagnant water at the bottom. While this might seem like a job for a professional, the most common culprit is simply a clogged filter or pump. Over time, small food particles, broken glass, and other debris can build up and obstruct the system that removes water. The good news is that this is often a simple fix you can do yourself. This guide will provide clear, beginner-friendly instructions on how to clean a dishwasher pump, restoring its draining power and getting it back in working order.
Before you begin, it’s important to gather a few basic tools and ensure the dishwasher is completely turned off for safety. Cleaning the pump might sound like a daunting task, but with a little patience and attention to detail, you can tackle it with confidence. By following these steps, you’ll not only save money on professional repairs but also extend the lifespan of your appliance.
Step-by-Step Guide on How to Clean a Dishwasher Pump
Step 1: Disconnect the Power for Safety
Before you begin any work on your dishwasher, your absolute first priority is safety. You must completely disconnect the appliance from its power source to eliminate any risk of electric shock. The easiest and most reliable way to do this is to go to your home’s main electrical panel and flip the circuit breaker that corresponds to your dishwasher to the “Off” position. If your dishwasher is plugged into an outlet under the sink, you can simply unplug it. Do not skip this step. It ensures your safety while you work with the internal components of the appliance.
Step 2: Remove the Bottom Dish Rack
With the power safely disconnected, you can now access the interior of the dishwasher. Open the door and pull the bottom dish rack completely out of the unit. This will give you a clear and unobstructed workspace to access the components at the bottom of the dishwasher tub. You will likely see a pool of standing water, which is normal for this issue. You will need to remove this water before you can proceed. Use a small cup or ladle to bail out most of the water into a bucket, then use old towels or a sponge to soak up the rest.
Step 3: Locate and Remove the Filter
The dishwasher’s filter is the first line of defense against clogs. It is typically a cylindrical plastic component located at the bottom of the tub, often near the base of the lower spray arm. Most modern filters can be removed by simply twisting them counter-clockwise and lifting them straight up. Some may have an additional flat, mesh screen underneath. Remove all filter components and take them to your sink. This part is designed to be cleaned regularly, and getting it out of the way is the first part of accessing the pump area.
Step 4: Clean the Filter Thoroughly
Once the filter is removed, you need to clean it meticulously. Food particles, grease, and mineral deposits can create a stubborn film that blocks water flow. Rinse the filter components under warm running water. Use a soft-bristled brush, like an old toothbrush, and some dish soap to gently scrub away any grime from the mesh screen and plastic housing. Pay close attention to the fine mesh, as this is where tiny particles get trapped. A clean filter is essential for proper drainage and is often the main cause of standing water issues.
Step 5: Remove the Spray Arm and Filter Housing
To get to the pump itself, you may need to remove a few more parts. The lower spray arm usually lifts right off its mount or is held in place by a plastic nut that you can unscrew by hand. After removing the spray arm, you will see the filter housing, which is the part the cylindrical filter was screwed into. This housing is often held in place by a few screws, typically Torx (star-shaped) or Phillips head screws. Use the appropriate screwdriver to remove them and carefully lift the housing out of the dishwasher.
Step 6: Inspect and Clear the Pump Inlet
With the housing removed, you will now have a direct view of the sump and the dishwasher pump inlet. This is where stubborn debris that made it past the filter ends up. Put on a pair of protective gloves to shield your hands from any sharp objects like broken glass or bone fragments. Carefully reach into the sump area and feel around for any obstructions. Common culprits include fruit pits, plastic wrappers, glass shards, or even small bones. Use needle-nose pliers to safely remove any hard objects you find, and a cloth to wipe away any soft gunk.
Step 7: Check the Drain Pump Impeller
The impeller is a small, fan-like component inside the pump that spins to force water out through the drain hose. With the pump inlet clear, you should be able to see or feel the impeller. Very carefully check if it can spin freely. Sometimes, a piece of string, a rubber band, or a hard object like a seed can get wedged in the impeller, preventing it from turning. If it is stuck, use your pliers or a small tool to gently dislodge the object. Once clear, the impeller should spin with little resistance.
Step 8: Reassemble and Test Your Work
Once you have cleared all debris, you can reassemble your dishwasher by following the previous steps in reverse. First, replace the filter housing and secure it with its screws. Next, re-install the lower spray arm. Then, place the clean, dry filter components back into the housing and twist to lock them into place. Finally, slide the bottom dish rack back into the dishwasher. With everything reassembled, you can restore power at the circuit breaker. To test your work, run a short rinse cycle and listen to make sure the dishwasher drains properly at the end.
Frequently Asked Questions
What Are the Signs of a Clogged Dishwasher Pump?
The most obvious sign is standing water in the bottom of the dishwasher after a cycle has finished. Other signs can include:
- Unusual grinding or humming noises during the drain cycle.
- Water draining very slowly.
- Dishes that are still dirty or covered in a gritty film, as the dirty water is not being removed effectively.
- A foul odor coming from the dishwasher due to stagnant water.
How Often Should I Clean My Dishwasher Filter?
For best performance, you should clean your dishwasher filter at least once a month. If you use your dishwasher daily or often wash heavily soiled dishes without pre-rinsing, you may need to clean it more frequently. A quick rinse of the filter every week or two is a great habit that can prevent most drainage problems from ever starting.
Can I Use a Chemical Drain Cleaner in My Dishwasher?
No, you should never use a harsh chemical drain cleaner in your dishwasher. These caustic chemicals can damage the plastic and rubber components of your dishwasher, including the pump, seals, and hoses, leading to expensive repairs. It is much safer to manually remove clogs or use a cleaning product specifically designed for dishwashers.
What Tools Do I Need to Clean My Dishwasher Pump?
You will likely need a few basic tools. These include:
- A Phillips head or Torx (star-shaped) screwdriver.
- A pair of protective gloves to keep your hands safe from sharp debris.
- Needle-nose pliers to remove stubborn or sharp objects.
- A small cup and some old towels to remove the standing water.
- A soft-bristled brush for cleaning the filter.
What if My Dishwasher Still Isn’t Draining After Cleaning the Pump?
If you have thoroughly cleaned the filter and pump inlet but the dishwasher still won’t drain, the clog may be further down the line. The next step is to check the drain hose itself for kinks or blockages. Disconnect the hose from where it connects to your sink’s plumbing or garbage disposal and check for clogs. If the hose is clear, the problem may be with the pump motor, which might require professional service.
Conclusion
A dishwasher filled with dirty water is a problem that can disrupt your entire kitchen routine. However, a clogged pump is an issue that most homeowners can resolve themselves with a little time and effort. By following a methodical process of disconnecting the power, removing the filter and spray arm, and clearing debris from the pump area, you can restore your appliance’s draining power. Now that you have a clear understanding of how to clean a dishwasher pump, you can confidently tackle this DIY task and save yourself the cost and hassle of a service call.
