Dishwasher drainage problems and fixes: 9 Check valve flapper & pump fixes

Written by David Lewis
5 Min read

LG Dishwasher fix – how to replace check valve flapper and drain pump

When an LG dishwasher is malfunctioning, one of the most common causes are issues with either the check valve flapper or the drain pump. Therefore, it’s important to know how to replace them in order to repair your appliance. Here’s a step-by-step guide to replacing both components, and some information on other common LG dishwasher malfunctions and what to do if your dishwasher isn’t draining.

How to replace the check valve flapper

Replacing the check valve flapper is fairly straightforward. To begin, unplug your appliance and turn off the water running to it. Make sure to open the door and remove the dish racks before proceeding to the next steps.

drain pump

Once these steps are completed, you will see the water guide securing clip. Unscrew the screw securing this clip to remove it and then remove the water guide. The check valve flapper should now be exposed. Lift it up and then disconnect it from the hose.

Grab the new check valve flapper and attach it to the hose. Reattach the water guide securing clip, tighten the screw, and you’re done.

How to replace the drain pump

GE Dishwasher Drain Pump Replacement WD19X25461

Replacing the drain pump requires more knowledge and effort than replacing the check valve flapper. First, disconnect the drain hose and fill line from the dishwasher. Then, carefully lay the dishwasher on its back. You should now see the large access panel covering the drain pump.

Remove the screws surrounding the panel and disconnect the wire harnesses. Unscrew the mounting screws of the old drain pump and grab the new replacement. Attach the new drain pump and reattach the wire harnesses. Screw the panel back into place and then carefully stand the dishwasher back up.

Other common malfunctions

In addition to check valve flapper and drain pump replacements, other common malfunctions in LG dishwashers include clogs in the drain hose. If you recently installed a new garbage disposal, there could also be a plugged drain tube that needs to be cleared.

What to do if your dishwasher is not draining

If you cannot figure out why your LG dishwasher is not draining, it’s best to contact an appliance repair specialist for assistance. They can help you diagnose the problem and refer you to the right parts and repair services.

Expert tip

Whenever replacing check valve flappers and drain pumps, make sure to double check that all connections are fully secured. This will help prevent any potential future repairs and save you time and money.

Does the heating element need to be replaced?

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In some cases, it is possible that your LG dishwasher’s heating element needs to be replaced for proper operation. This can be especially true if the dishwasher does not seem to be drying dishes properly or is taking longer to cycle than it used to. If you suspect that the heating element might need to be replaced, consult an appliance repair specialist for guidance.

Checking the water inlet valve

The water inlet valve of your LG dishwasher may also be at fault if the appliance is malfunctioning. To check the valve, make sure that the power to the machine is off and then unplug it from the wall. Next, unscrew the screws holding the panel in place and remove it to access the valve. Use a multi-tester to check the leads to determine whether the valve is functioning properly.

Troubleshooting error codes

Many LG dishwashers will display error codes on the control panel when malfunctions occur. It’s important to be aware of these codes so that you can diagnose any issue quickly and accurately. Common error codes include LE for when there is an issue with the water level, OE for drainage problems, and IE for issues with the inlet valve.

Is the filter clogged?

The filter located inside the dishwasher can easily become clogged with food and other debris, resulting in ineffective cleaning and performance. If you suspect that your filter is clogged, unplug the dishwasher and remove the lower kick panel. This should reveal the filter. Remove it, rinse it thoroughly with water, and reinstall it.

Inspecting the drain hose

If your LG dishwasher is not draining properly, it’s important to inspect the drain hose. Make sure that the hose is not kinked and that it is properly connected to the drain outlet. If the hose appears to be in good condition and is connected correctly, the next step would be to inspect the drain pump.

What to do If the dishwasher Is leaking

If you notice that your LG dishwasher is leaking, the cause could be a broken or worn door gasket, warped door panels, or leaking water supply lines. Start by inspecting all the aforementioned components and replace anything that appears to be damaged or in need of repair.

Diagnosing issues with the detergent dispenser

If your LG dishwasher is not dispensing detergent properly, there are a few steps you can take to troubleshoot the issue. Begin by checking the detergent dispenser cup and making sure that the lid is not blocked by anything. If the cup appears to be in working order, the next step would be to inspect the pressure switch.

Easy Fix For Dishwasher That Wont Drain | THE HANDYMAN

Inspection of the pressure switch

The pressure switch is responsible for regulating the flow and pressure of water coming into the dishwasher. If it fails, your dishwasher may malfunction. To inspect the pressure switch, locate it (near the bottom of the unit) and unplug the wires. Then, use a multimeter to test the switches for continuity.

Do you need to replace the circulation pump?

It’s also possible that the circulation pump needs to be replaced if your LG dishwasher isn’t functioning properly. This component is responsible for pumping water throughout the machine. To replace the circulation pump, you will need to remove the upper and lower panels. Disconnect the old pump and install the new one, then reattach the panels.

Inspection of the control board

Lastly, your LG dishwasher’s control board may be malfunctioning. To check the board, unplug the dishwasher, remove the outer panel, and locate the control board. First, visually inspect the board for signs of damage, and then use a multimeter to test the components within it. If it appears to be in good condition, you should look at other components of the unit for causes of the malfunction.

In this article, a step-by-step guide was provided on how to replace both a check valve flapper and a drain pump in an LG dishwasher. It also covered other common malfunctions, what to do if the dishwasher isn’t draining, inspecting water inlet valves, troubleshooting error codes, checking filters, inspecting drain hoses, and diagnosing issues with the detergent dispenser. Lastly, it discussed replacing the circulation pump, and checking the control board for signs of damage. In short, this article suggests replacing these components or checking them for damages as potential solutions to any LG dishwasher malfunctions.

Appliances made simple. 

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