Have you ever opened your dishwasher only to find undrained water inside? Or does it sound like your appliance is struggling through cycles? You may have a dysfunctional dishwasher pump on your hands. These hard-working pumps are crucial to cleaning dishes effectively but, unfortunately, fail over time. Here, we’ll discuss the common causes of dishwasher pump failures, how to diagnose issues, and provide a step-by-step guide to fixing your pump and getting your appliance draining smoothly again. Read on to learn more!
Understanding Your Dishwasher’s Pump System
Your dishwasher uses pumps to wash and drain the water during cleaning. Knowing how they work helps fix problems. Let’s look at the main pump types and what they do.
Types of Dishwasher Pumps
There are two pump types in dishwashers:
- Drain pump – This pump removes dirty water from the tub. It is located at the bottom of the dishwasher. The drain pump moves water through a hose into the sink drain or garbage disposal.
- Circulation pump – This pump sprays water through the spray arms to clean dishes. It circulates the water during wash and rinse cycles. The circulation pump is mounted under the tub.
Have you ever wondered how the pumps water the right way? Keep reading!
How Each Pump Works
The drain pump only runs at certain times. It turns on near the end of wash and rinse cycles. This removes the dirty water from that cycle. The drain pump also runs after the final rinse to empty the dishwasher before it shuts off.
The circulation pump runs through much of the cycle. During wash and rinse times, it sprays water from the spray arms onto dishes. The circulation pump forces the water through filters to remove food bits. It also makes sure soap spreads evenly for cleaning.
Common Signs of Dishwasher Pump Failure
If your dishwasher isn’t cleaning right, the pump may be the problem. Look for these five issues:
- Standing water in the dishwasher – If water won’t drain after the cycle, the drain pump is likely clogged. Debris keeps it from pumping water out.
- Unusual noises during operation – The circulation pump should hum, not screech. Loud or grinding noises suggest an issue is keeping the pump from turning right.
- Dishes not getting clean – If dishes come out dirty, weak spray from clogged or worn circulation pump parts could be the reason.
- Leaking from the bottom of the dishwasher – Leaks point to a drain pump not fully turning off. This lets water trickle out continuously.
- Error codes on the display panel – Pump problems often trigger error codes. These vary by brand but signal issues like a stuck impeller.
Diagnosing Dishwasher Pump Issues
Figuring out what’s wrong with the pump can be tricky. Here are some tips to help you diagnose common pump problems:
1. Visual inspection
Take a close look at the pump and connected parts. This can reveal issues like:
- Debris or blockages: Check the pump filter and inlet hose for food particles, grease, soap scum, and other gunk that could clog the system.
- Damage: Examine the pump casing, impeller, and hoses for cracks, leaks, and wear.
2. Testing the drain pump
The drain pump removes water from the dishwasher tub. To check if it’s working properly:
- Use a multimeter to test for continuity between wires. If there’s no continuity, the pump needs replacing.
- Disconnect inlet and outlet hoses. Blow through the inlet hose to verify water flows freely.
- Check that nothing is jammed in the pump impeller.
3. Inspecting the circulation pump
The circulation pump sprays water during the wash cycle. To test it:
- Remove the lower spray arm and peek into the circulation pump inlet.
- Power on the dishwasher briefly and look for proper impeller movement.
- If the impeller doesn’t spin smoothly, the pump may be jammed or faulty.
4. Verifying electrical connections
Make sure electrical connections to each pump are secure and corrosion-free. Faulty wiring can prevent pumps from operating normally.
Also Read DIY Solutions for a Dishwasher That Won’t Turn On
Step-by-Step Guide to Fixing Common Pump Problems
1. Clearing Blockages
Cleaning out debris and blockages is often the easiest way to fix pump issues. When stuff gets stuck, it can stop the pump from working right.
Removing debris from the pump and filters
The first step is to check the filter and pump for gunk. Have you ever pulled a wad of socks out of the dishwasher? Yuck! Clean those areas well with warm, soapy water.
You can even use a old toothbrush to scrub nooks and crannies. Taking out the stuck stuff lets the pump move freely again.
Unclogging the drain hose
Sometimes junk also gets stuck in the hose that drains dirty water. To clean it, remove the hose from the dishwasher.
Flex and squeeze the hose over a trash can to push out clogs. Check both ends for blockages, too. A bright light helps spot hidden gunk.
Clear blockages make the dishwasher pump’s job much easier. This simple fix works great most of the time.
2. Replacing a faulty drain pump
If cleaning doesn’t do the trick, the pump itself may need replacing. Here are the steps:
Tools needed
You’ll need:
- Screwdrivers (both flathead and Phillips)
- Pliers or a wrench
- Replacement pump
Removal process
First, unplug the dishwasher or turn off the breaker. Then remove any screws or covers to access the pump. Disconnect the electrical wires and hoses attached. The old pump can now be removed.
Installation of the new pump
Align and connect all parts to the new pump. Make sure wires and hoses are secure. Then screw or snap the replacement into place. Replace the covers and plug the dishwasher back in.
Replacing the pump fixes it for good. Just be sure to get the right model for your dishwasher.
3. Repairing or replacing the circulation pump
Clogged impellers or dead circulators need attention, too.
Addressing impeller issues
Gentle cleaning often fixes stuck impellers. Remove debris blocking movement. Test and replace if damaged.
Full pump replacement procedure
Follow steps similar to drain pump removal and installation. Electrics and plumbing attach in the same basic way.
4. Addressing electrical issues
Sometimes, the problem isn’t mechanical but electrical. A few checks can remedy this.
Checking and replacing faulty wiring
Inspect wires for cracks, breaks, or loose connections. Push firmly to repair loose spots. Cut and replace damaged wiring.
Resetting the dishwasher’s control board
Control boards can glitch. To reset, unplug for 30 seconds, then plug back in. Or locate the reset button and press/hold it in.
Also Read How to Replace a Dishwasher Circulation Pump Motor
Conclusion
Understanding how your dishwasher pumps work is key to diagnosing issues. With some basic troubleshooting and DIY fixes, you can often get your dishwasher draining properly again.
Let’s review the key points:
- Inspect pumps and hoses for debris and damage.
- Test pump operation and electrical connections.
- Clear jams and replace defective parts as needed.
- Take safety precautions and seek professional help for complex repairs.
While dishwasher pump problems can be frustrating, they don’t have to mean buying a new appliance. With a bit of effort, you can likely get your existing dishwasher running smoothly again.