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Why Does My Dishwasher Say H20?

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Every homeowner’s nightmare is finding an error code on their dishwasher, especially if it’s right after a big family dinner. One of the most common error codes you may come across is the H20 error. But what does this mean, and how can you fix it? This comprehensive guide will answer all your questions about the H20 error code on your dishwasher and offer practical solutions.


The H20 error code on your dishwasher indicates a problem with the water supply. This could mean your dishwasher isn’t getting enough water, or any at all, during the water fill phase of the cycle. The issue can be caused by various factors such as insufficient water supply, low water pressure, a blocked hose, a faulty water inlet valve, a malfunctioning float switch, or even a faulty control board. It’s recommended to troubleshoot these potential causes or contact a professional if the issue persists.

What Does the H20 Error Code Mean?

The H20 error code is an indication that your dishwasher is having trouble with its water supply. In other words, it’s not getting enough water or no water at all during the water fill phase of the cycle. This error can be triggered by various factors such as insufficient water supply, low water pressure, a blocked hose, a faulty water inlet valve, a malfunctioning float switch, or even a faulty control board.

Main Causes for the H20 Error Code

Several factors can cause an H20 error code. Here are the most common ones:

  1. Insufficient water supply or low water pressure: If the water supply to your dishwasher is turned off or if the pressure is too low, your dishwasher may not get enough water to operate correctly, leading to an H20 error code.
  2. A blocked hose: If the water supply hose to your dishwasher is kinked or blocked, it can restrict the water flow, resulting in an H20 error code.
  3. A damaged or clogged water inlet valve: The water inlet valve allows water to enter your dishwasher. If this valve is damaged or blocked by debris, it can prevent water from flowing into your dishwasher, causing an H20 error code.
  4. A malfunctioning float switch: The float switch monitors the water level in your dishwasher. If it’s not working properly, it may incorrectly signal that the dishwasher is not getting enough water, triggering an H20 error code.
  5. A faulty control board: The control board manages all the functions of your dishwasher. If it’s faulty, it can incorrectly signal an H20 error code.

Troubleshooting the H20 Error Code

Before you call a professional, try these troubleshooting steps to resolve the H20 error:

  1. Ensure the water supply is turned on: Check that the water supply valve under the sink nearest the dishwasher is fully open.
  2. Inspect the water supply hose: Make sure there are no kinks or obstructions that could restrict water flow.
  3. Check for debris in the water inlet valve: Inspect the valve for any debris or clogs that could be preventing water from entering the dishwasher.
  4. Examine the pressure sensor: The H20 error code could be caused by a faulty pressure sensor. If debris gets into the pressure switch, it can cause issues with the dishwasher’s water supply.
  5. Inspect the float switch: Ensure that the float switch is not obstructed, as this can also cause the H20 error code.
  6. Reset the dishwasher: Select another cycle option, then put the option back to your desired setting to clear the H20 code.

If the error persists after trying these steps, it’s time to call in a professional.

When to Call a Professional

If you’ve tried the steps above and the H20 error code persists, it’s recommended to contact a professional technician for further diagnosis and repair. This is especially important if you suspect that the problem is due to a faulty control board or a malfunctioning float switch, as these issues require professional expertise to fix.

Preventing Future Issues

To prevent future issues with your dishwasher, regular maintenance is key. This includes cleaning the filter, door, seals, and spray arms regularly, performing monthly cleanings, running the dishwasher regularly, using the correct detergent and rinse aid, checking the water temperature, and loading dishes correctly. By following these maintenance tips, you can help keep your dishwasher running smoothly and extend the life of your appliance.


Understanding what the H20 error code means and how to troubleshoot it can save you time and money. By taking a proactive approach to maintenance and understanding the common issues that can lead to this error, you can keep your dishwasher running efficiently for years to come. However, if the issue persists despite your best efforts, don’t hesitate to call in a professional. After all, a well-maintained dishwasher is an efficient one.

Frequently Asked Questions

What does the H20 error code look like on my dishwasher’s display?

The H20 error code will typically appear as “H20” or “H2O” on the digital display of your dishwasher. It may also be accompanied by flashing lights or a beep.

Can I prevent the H20 error code by regularly checking the water supply hose and water inlet valve?

Yes, regular checks and maintenance of your dishwasher, including the water supply hose and water inlet valve, can help prevent the occurrence of the H20 error code. Ensure that the hose is not kinked and the valve is not blocked.

Can a faulty control board cause other error codes apart from H20?

Yes, a faulty control board can cause various error codes, not just H20. The control board manages all the operations of your dishwasher, so any malfunction can lead to a variety of issues.

How often should I clean my dishwasher to prevent error codes?

It’s recommended to clean your dishwasher thoroughly at least once a month. Regular cleaning includes the filter, door, seals, and spray arms. This can help prevent error codes and extend the life of your appliance.

Is it harmful for my dishwasher if I keep running it with the H20 error code?

Yes, if you keep running your dishwasher with the H20 error code, it may lead to more serious damage. It’s best to troubleshoot the issue as soon as you notice the error code. If you can’t resolve the issue yourself, call in a professional.

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