6-4 error on a Maytag dishwasher: What it means and how to fix it

Don’t let a Maytag dishwasher showing a 6-4 error code disrupt your cleaning routine! This is something you don’t need to call a technician for since you can troubleshoot it yourself.

We’ve got you covered. Let’s walk through all the steps together.

If you find out that you need any replacement parts for your Maytag dishwasher while you’re troubleshooting, you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

Important: The troubleshooting information provided in this article may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.

What does the 6-4 error code mean?

The 6-4 fault code on a Maytag dishwasher typically indicates an issue with the water level control system. Specifically, this code signifies a problem with the float switch.

The float switch is a safety mechanism that monitors the water level inside the dishwasher tub. It’s designed to shut off the water inlet valve if the tub overfills, which helps prevent water leaks and damage.

What you need

• Multimeter
• Screwdrivers

Important: The specific tools required may vary depending on the model of your appliance and the type of fasteners used on it. Always consult the user manual or refer to any specific instructions provided by the manufacturer for the recommended tools for your appliance model.

Read more: How to Clean a Dishwasher 

Safety precautions

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind:

• Always power off and unplug your appliance or switch off the circuit breaker before you attempt any maintenance or replacement work. This keeps you safe by eliminating any risk of electric shock.
• Don’t test live voltage with a multimeter if you’re unfamiliar with how to prevent short-circuiting.
• Turn off the water supply at the outlet before beginning repairs. Keep towels ready to catch any residual water in the system when removing parts.
• If the appliance has recently been used, give it plenty of time to cool down before working on it.
• Take your time while working to prevent accidents and personal injuries. Rushing is the enemy of precision.
• Work in a well-lit area so you can see and access appliance parts.
• Keep your workspace free of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with wet hands. Make sure the work area is completely dry.
• Check the user manual to see if there are specific installation or safety instructions related to your appliance or replacement part.
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause personal injury.
• Wear insulated work gloves to protect your hands from sharp metal parts and debris.
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.
• Always take photos or make a note of wiring terminals or other connections before disconnecting them to make reassembly easier.

Read more: Surprising Things That Can & Can’t Go in the Dishwasher

How to troubleshoot the 6-4 error code

Follow these steps to clear the 6-4 error from your Maytag dishwasher.

Step 1: Inspect the float switch

1. Find the float switch, which is typically located near the bottom of the dishwasher tub.
2. Inspect the float switch and the surrounding area for any obstructions or debris that may be preventing the float from moving freely.
3. Gently lift the float and listen for the “click” of the switch contacts as the float moves up and down. If the float is stuck or the switch contacts are not clicking, gently clean the float and the switch mechanism.
4. Check the level of the dishwasher with a bubble level. Adjust the leveling legs if necessary to make the dishwasher level.

Step 2: Check for excessive sudsing

1. Make sure the dishwasher is plugged in and the water supply is turned on.
2. Allow the dishwasher to fill and wash for about 1 minute.
3. Open the door and visually check the water level and amount of sudsing in the tub.
4. If you see excessive sudsing or foaming, it may mean there’s a problem with the detergent dispenser.

Disconnect the power to the dishwasher and check the detergent dispenser if you notice excessive detergent or rinse aid leakage. If the dispenser is damaged, replace it.

Step 3: Inspect the drain hose check valve

1. Find the drain hose connection at the back of the dishwasher.
2. Disconnect the drain hose from the plumbing connection.
3. Elevate the drain hose above the level of the dishwasher tub.
4. Pour water into the drain hose and see if the water flows back into the dishwasher tub. If the water flows back into the dishwasher, then the drain hose check valve isn’t sealing properly, so the entire drain loop assembly should be replaced.

NOTE: When installing the new drain loop, position it as high as possible and attach it securely to the underside of the countertop, if possible, to prevent water from backing up into the dishwasher.

Step 4: Check the fill valve

See if the dishwasher fills while the door is open. If the dishwasher is still filling while the door is open, then the fill valve is mechanically stuck in the open position and will need to be replaced.

If the dishwasher isn’t filling with the door open, then you’ll need to check the operation during a service diagnostics test cycle.

1. To enter the service diagnostic cycle, you need to press a specific sequence of 3 keys (such as 1-2-3) 3 times — with no more than 1 second between key presses — while the dishwasher is in standby mode. This will start the diagnostic cycle when the door is closed.
2. Advance the service cycle until the detergent dispenser opens. At this point, the fill valve should be off.
3. Listen closely to see if the dishwasher is filling. If it’s filling, unplug the dishwasher and replace the control board.

Read more: Dishwasher Won’t Start: Top 6 Reasons and Fixes

Looking for more?

Thank you for reading! We hope this guide helped you get your Maytag dishwasher working again.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos.

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog and more.

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