How To Fix Dishwasher Check Valve? Follow These Steps

Since the dishwasher check valve is a tiny but key component, it reacts to changes in water pressure by allowing more water to enter or preventing it from doing so. You should know how to replace a check valve and the significance of doing so to help guarantee your dishwasher functions safely and effectively.

Many appliances in today’s technological world make our lives easier. Introducing new and more energy-efficient appliances has made household chores easier. Nothing beats preprogrammed settings on a dishwasher for relieving the stress of handwashing dishes after dinner.

Even the most expensive dishwashers have flaws. Leaks around the door or the gasket are one of the most common dishwasher problems. These could be the result of an old or faulty check valve; this article will explain why they are so important and how to replace one if one fails.

What Is A Dishwasher Check Valve?

Dishwasher check valves are essential to any dishwashing unit because they prevent backflow. A faulty check valve is the most common cause of water reversal. Recognize the symptoms of a defective check valve and replace it right away to avoid system damage and repair costs.

Install check valves between the water supply and the unit’s inlet. The valve has a spring-loaded ball that closes and opens when water flows through it. The ball shuts when interrupted, stopping the water from flowing again.

This valve is critical for contamination prevention because it prevents water from being drawn back into the water source.

Why Is The Dishwasher Check Valve So Important?

The dishwasher check valve acts as a backflow prevention device. It prevents water from flowing backward into the water supply. It accomplishes this by employing a spring-loaded ball. When the water is flowing properly, it can pass through the valve.

When the water flow stops, the ball closes and prevents the water from flowing back in the opposite direction. The dishwasher check valve is also critical for energy savings.

It demonstrated that a faulty or broken check valve could result in a 30% loss of efficiency and an increase in energy consumption. This can add up over time, so keeping this part of the dishwasher in good working order is critical.

Why Does It Leak?

Check valves intended to become clogged over time, causing them to leak. Minerals and other substances in the water can accumulate inside the valve over time, causing it to lose effectiveness. This can result in water flowing backward through the valve and out of the hose’s end.

If you’ve noticed water pooling beneath your dishwasher or it’s not cleaning as well as it used to, the most likely cause is a leaking check valve. Check valves can clog for a variety of reasons.

They may become clogged due to minerals dissolved in the water supply or food particles deposited by cleaning dishes. These problems can result in high water pressure in the hose and a leaking check valve. The valves may also damage as a result of clogging or aging.

Types Of Dishwasher Check Valves

Many believe that a dishwasher only includes a ball check valve, the only check valve. However, this is untrue because there are numerous sorts of check valves that you can use in dishwashers.


Butterfly valves and ball check valves are the two most popular types. Due to their larger capacity and full closure when not in use, butterflies are more popular than ball check valves. Let’s take a look at a few:

  • Butterfly Dishwasher Check Valves: These dishwasher check valves are usually metal and have a plastic disc. This disc closes the valve when water goes out of the machine and opens when water flows into the machine. Butterfly valves are widespread in dishwashers, which close completely when not used.
  •  Diaphragm Dishwasher Check Valves: These types of valves are made of rubber and have an internal diaphragm that closes the valve when water flows out of the machine and opens when water flows into the machine. This disc closes completely when not in use and has the advantage of being able to close at very low pressures. 
  • Solenoid Dishwasher Check Valves: These valves control the machine’s water flow in both directions. They are electrical valves held by an electrical circuit. 
  • Stem/Seat Dishwasher Check Valves: These check valves close when water flows out of the machine. They open when water flows into the machine. This closing and opening action happens due to a rise in water pressure.

Measuring incoming water pressure can be controlled by measuring the incoming water pressure. If it’s working correctly, check the water pressure while the dishwasher is running. The dishwasher will leak from the bottom of the valve and needs to close correctly.

How To Check For A Faulty Dishwasher Check Valve?

Before fixing the problem, you must determine whether a faulty check valve causes it. You can accomplish this by following these steps:

  • Turn off the dishwasher’s water supply 
  • Open the door and remove the filter inside the door 
  • Pour a cup of water into the filter and wait for the water to drain through 
  • If no water comes back through the filter, the check valve may be faulty and should replace.

By keeping an eye out for a broken dishwasher check valve, you can address the problem, take rapid action, and prevent any immediate issues by keeping an eye out for a broken dishwasher check valve.

How To Repair A Dishwasher Check Valve?

If you’ve determined that the dishwasher check valve is faulty and needs to be replaced, proceed as follows:

  • Turn off the dishwasher’s water supply 
  • Unscrew the two screws that hold the check valve in place 
  • Remove the old check valve and replace it with a new one 
  • Screw the new check valve back into place and turn on the water supply 
  • Before closing the door, open it and check that the check valve is working properly.

Since one of your home’s most useful and necessary appliances is the dishwasher, it can save you time and effort by doing dishwashing. If this item isn’t properly maintained, it could also lead to issues. 

A check valve is one of the most frequent problems with dishwashers. Your dishwasher’s check valve stops water from spilling out when it’s not in use. If this valve starts to leak, the water could ruin your dishwasher and cost you money to fix. 

Fortunately, repairing a dishwasher check valve is relatively easy. We’ll demonstrate how to fix a dishwasher check valve in this article.

What To Look For In A New Check Valve?

If you suspect your check valve is causing the leak, you should replace it as soon as possible to avoid flooding your kitchen. While the brand and model of your dishwasher aren’t factors in choosing a new check valve, the hose diameter is.

Since most appliances are the same size, you should be able to find a replacement at any hardware store that sells dishwasher parts. However, choosing the correct hose diameter is critical to avoid hose over-pressurization. The diameter of the hose on your dishwasher is the best way to determine this.

Installing The New Check Valve

You are now prepared to install the check valve after removing the old valve and replacing it with the new one. 

First, cover the screw on top of the new valve with the rubber washer. Someone should screw the valve into the attachment on the side of the water line.

Now connect the connector on the new valve to the dishwasher’s hose. Once you are sure that it is in place, cautiously turn on the water to check for leaks. If everything appears in order, turn off the water, and you’re done!

Set The Dishwasher Hose In Place

It’s time to connect the water hose for your dishwasher now that you have installed a new check valve. The hose has a small, spherical connector that screws off and is roughly two feet long. 

Open the dishwasher door to ensure that your kitchen isn’t flooding. The water pump should start running when you shut off the dishwasher. Restart the water once the hose is attached to the dishwasher and check for leaks.

Benefits Of Installing A Dishwasher Check Valve

Installing a dishwasher check valve is important in ensuring that your dishwasher works appropriately. Water entering your dishwasher must pass through a check valve before entering the dishwasher tub. 

The check valve prevents too much water from entering and overflowing the dishwasher tub during heavy loads. Water can back up and cause debris inside the dishwasher tub if insufficient water flows through the check valve. This can result in a clog or leak in your dishwasher.

If your dishwasher leaks while running, you should look for a faulty check valve. 

Also, if your dishwasher drains slowly or smells like mildew, you most likely have a clogged or leaking check valve.

To check for a leaky check valve, simply run an empty cycle without any dishes in the dishwasher and wait for it to drain completely before running another cycle with dishes loaded. If a lot of water comes out of the drain hose after this second run, you most likely have a leaking check valve.

There are numerous advantages to installing a dishwasher check valve; let’s take a look at a few of them:

  • Prevents backflow of water into hot water supply lines: Dishwashers depend on a hot water supply to perform the cleaning process. During this time, the water in the supply line remains hot. The machine will only work properly if there is a low water flow due to a clogged line or a break in the supply line. 

If the supply line restored the water flow and the water is cold, there is a chance that it could mix with the hot water in the line. This could result in scalding. A dishwasher check valve prevents this by directing the water flow to the machine only when it is hot. 

  • Prevents water from flowing out of cold water supply lines: Sometimes, there can be a high flow of water in the cold water supply line, due to which there might be a drop in pressure in the hot water supply line. 

This low pressure in the hot water supply line could result in water flowing back into the cold water line. This could affect the entire house’s water pressure and result in flooding. A dishwasher check valve prevents this by directing the water flow only when it is cold.

  •  Reduces the risk of flooding: If water flows backward in the supply lines and is not controlled, where the floor isn’t waterproof, it could lead to flooding in that area. A dishwasher check valve reduces this risk by directing the water flow only when cold.

When dishwashers are overloaded or improperly installed, the dishwasher water can flood your basement or crawl space. When this occurs, it is critical to understand how to install a dishwasher check valve. A dishwasher check valve is a one-way valve that connects to the drain line and hose.

The dishwasher check valve is a vital device to prevent flooding in your basement or crawl space before it occurs. The dishwasher check valve’s primary function is to prevent drain back from reaching your sump pump, but it can also be used for other purposes.

Summing up

A faulty or broken check valve can cause damage to the dishwashing unit, causing a loss of energy efficiency and damage to the system. Keeping a check valve in good working order is important. If the dishwasher has a faulty check valve, it’s vital to repair or replace it. This will prevent further damage to the unit.

Read more:

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Michael Bowen

Michael Bowen

Michael Bowen is an ambitious entrepreneur who has been in the business of building homes since he was 19. Michael's commitment to honesty, integrity, and high-quality workmanship has earned him a reputation as one of the best in the business.

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