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LG Dishwasher overflowing

If your LG dishwasher is overflowing, start with the most likely cause: a water inlet valve that is stuck open or not shutting off when the tub reaches the proper level. This can lead to dishwasher overfills with water, water collecting in the bottom between cycles, or an LG dishwasher water level too high even when the machine is off. Next, check the main control board, since a shorted board can keep sending power to the water inlet valve during the cycle. A cracked lower wash arm assembly can also throw water toward the door and make an LG dishwasher overflowing problem look like a leak. After that, rule out too much or the wrong type of detergent, which can create oversudsing, and then inspect the float switch to make sure it is not stuck or defective. If your dishwasher is overflowing or seems to overfill with water, enter your model number on RepairClinic.com to find the exact LG water inlet valve, main control board, control board, lower wash arm assembly, or float switch that fits your dishwasher.

01 - LG Dishwasher Water Inlet Valve

The water inlet valve is an electrically-controlled valve that opens to allow water to enter the dishwasher. Depending on the model, the valve stays open either for a set length of time or until the dishwasher has enough water. However, if the water inlet valve doesn’t shut off after the dishwasher has enough water, the dishwasher will overflow. If water drips into the dishwasher when the door is open, or if water collects at the bottom of the dishwasher while it is not use, you may need to replace the water inlet valve.
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02 - LG Dishwasher Main Control Board

A dishwasher's main control board provides power to nearly every electrical component in the dishwasher. If the control board continues to send power to the water inlet valve during the drain cycle, the dishwasher could overflow. While this is not that common of a problem, you can inspect the board for signs of burning or a shorted-out component. You can also use a multimeter to test the water inlet valve for incoming power during the dishwasher's cycle.
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03 - LG Dishwasher Lower Wash Arm Assembly

If the lower wash arm has a crack or split on the side it can cause water to splash out the bottom of the door, giving the impression that the dishwasher is overflowing. Inspect the wash arm assembly for any damage and replace if necessary.
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04 - Wrong type or incorrect amount of detergent

Make sure to use the proper dishwasher detergent. Use the proper amount of detergent for your water hardness; too much soap in soft water can cause oversudsing and leaking.
Common

05 - LG Dishwasher Control Board

A dishwasher's control board provides power to nearly every electrical component in the dishwasher. If the control board continues to send power to the water inlet valve the dishwasher could overflow. While this is not that common of a problem, you can inspect the board for signs of burning or a shorted-out component. You can also use a multimeter to test the water inlet valve for incoming power during the dishwasher's cycle.
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Common

06 - LG Dishwasher Float Switch

The float switch actuates in order to prevent the dishwasher from overflowing. If the float switch is defective or stuck, it might not stop the dishwasher from overflowing. If the float switch is defective, replace it.
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Common

Frequently Asked Questions

Why is my LG dishwasher overflowing?
Why is water collecting in my LG dishwasher when it is off?
How do I test an LG dishwasher float switch or water inlet valve?
Can a bad wash arm make it look like my LG dishwasher is overflowing?
How do I find the right LG dishwasher overflow part at RepairClinic.com?

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